CN107478617B - Remote groundwater multi-parameter online detection method and measurement device - Google Patents

Abstract

The invention discloses a remote groundwater multi-parameter online detection method and a measuring device. The remote control instrument sends a control signal to the on-site measuring instrument to wake up the on-site measuring instrument; in the on-site measuring instrument, the groundwater sample extraction and cleaning device extracts the groundwater to be measured, and the groundwater quality multi-parameter detection device detects the groundwater to be measured, and the detection data is transmitted through GSM The communication is sent back to the remote control instrument, and finally the groundwater sample extraction and cleaning device cleans the internal water sample channel for the next groundwater test to be measured, thus realizing remote multi-parameter online detection of groundwater. The invention can remotely detect groundwater substances such as chemical oxygen demand, nitrate ions, chromium ions and turbidity in groundwater quality, getting rid of the disadvantages of traditional chemical detection of secondary environmental pollution and shortening the cycle of groundwater quality detection. , which simplifies the process of groundwater quality testing and meets the needs for fast and effective testing.

Description

Remote groundwater multi-parameter online detection method and measurement device

Technical field

The invention relates to a parameter detection method and device, and in particular to a remote groundwater multi-parameter online detection method and measurement device.

technical background

With the rapid development of the economy and the acceleration of urbanization, groundwater quality pollution incidents occur frequently. How to quickly and effectively detect and evaluate the pollution of groundwater has become the key to solving this problem. Among them, groundwater quality detection technology is the guarantee for solving this problem. . At present, in the field of groundwater quality testing in my country, manual on-site sampling and laboratory instrument analysis are the main methods. There are shortcomings such as large sampling errors, long testing cycles, complicated operations, and inability to reflect changes in water pollution in a timely manner. It is difficult to meet the requirements of rapid and effective The need to detect and evaluate the contamination of groundwater.

Contents of the invention

In order to solve the problems existing in the background technology, the purpose of the present invention is to provide a remote groundwater multi-parameter online detection method and measuring device, which can realize online remote chemical oxygen demand (COD), nitrate ions, chromium ions and turbidity of groundwater water quality. Multi-parameter detection meets the need for rapid and effective detection and evaluation of groundwater contamination.

The technical solution adopted by the present invention is:

1. A remote groundwater multi-parameter online detection method:

Send control signals to on-site measuring instruments through remote control instruments to wake up on-site measuring instruments;

On-site measurement instruments include a groundwater sample extraction and cleaning device for extracting groundwater to be measured and a groundwater water quality multi-parameter detection device for detecting groundwater to be measured. The groundwater sample extraction and cleaning device extracts the groundwater to be measured, and the groundwater water quality multi-parameter detection device When the groundwater to be measured is detected, the detection data is calculated by the MCU and sent back to the remote control instrument through GSM communication. Finally, the groundwater sample extraction and cleaning device cleans the internal water sample channel for the next groundwater to be measured, thus realizing Remote groundwater multi-parameter online detection.

The described multi-parameter detection device for groundwater quality detects the groundwater to be tested, specifically: the deuterium light source emits ultraviolet light, which is condensed and then incident into a filter with a characteristic peak wavelength of the material, and is filtered to obtain the ultraviolet light that matches the material. Single-wavelength light is then transmitted through the groundwater solution to be measured. The light intensity value of the single-wavelength light before and after passing through the groundwater to be measured is detected. The ratio of the light intensity values before and after is used to calculate the Lambert-Beer formula to obtain the groundwater solution to be measured. concentration of the substance in.

The substance may be chemical oxygen demand (COD), nitrate ions, chromium ions or turbidity.

2. A remote groundwater multi-parameter online detection device:

Including on-site measuring instruments and remote control instruments, the two are connected through wireless communication.

The on-site measurement instruments include a groundwater quality multi-parameter detection device and a groundwater sample extraction and cleaning device. The groundwater quality multi-parameter detection device includes a slide rail platform, a groundwater multi-parameter processing module, and a deuterium light source and quartz installed on the slide rail platform. Plano-convex lens, controllable rotating filter six-wheel ring module, incident light intensity detection module and light shielding box;

The first slide rail and the second slide rail are arranged front and back on the slide rail platform. The deuterium light source is installed on the slide block. The slide block is installed on the first slide rail. Quartz plano-convex lens, controllable rotating filter six-wheel ring module, The incident light intensity detection module and the light shielding box are installed on the second slide rail through their respective sliders. The quartz plano-convex lens, the controllable rotating filter six-wheel ring module, the incident light intensity detection module and the light shielding box are installed along the exit of the deuterium light source. The light directions are arranged in sequence;

The double-pass quartz cuvette and the transmitted light intensity detection module of the groundwater sample extraction and cleaning device are sequentially placed in the light-shielding box along the direction of the emitted light of the deuterium light source. The double-pass quartz cuvette contains the groundwater to be measured. The measured groundwater is poured into a double-pass quartz cuvette by a groundwater sample extraction and cleaning device and cleaned;

Connect the output end of the incident light intensity detection module and the output end of the transmitted light intensity detection module to the input end of the groundwater multi-parameter processing module through a twisted pair, and the output end of the groundwater multi-parameter processing module is connected to the transmitting antenna;

The remote control instrument is mainly composed of a remote receiving and transmitting device and a PC host computer. The input end of the remote receiving and transmitting device is connected to the receiving antenna, and the output end of the remote receiving and transmitting device is connected to the PC host computer.

A moving pair is formed between the slide block and the slide rail of the present invention, so that the slide block moves horizontally along the slide rail, thereby driving the components on the slide block to also move horizontally to adjust the arrangement position of the components along the optical axis.

The described groundwater sample extraction and cleaning device includes a liquid tank to be tested, a quartz cuvette liquid level tank, a clean water tank, a four-way interface, three liquid level detection sensors, three normally closed solenoid valves and two micro vacuum self-priming type water pump; the liquid water tank to be tested, the quartz cuvette liquid level water tank and the clean water water tank are arranged at the same height. The liquid to be tested water tank, the quartz cuvette liquid level water tank and the clean water water tank are all equipped with their own ventilation holes on the top. The water tank, quartz cuvette liquid level water tank and clean water water tank are all equipped with liquid level detection sensors;

The input port of the micro vacuum self-priming water pump for the liquid to be tested is connected to the inlet of the liquid to be tested, and the output port of the micro vacuum self-priming water pump for the liquid to be tested is connected to the bottom of the water tank for the liquid to be tested. The bottom of the water tank for the liquid to be tested is connected to the first constant. After closing the solenoid valve, connect it to one port of the four-way interface;

The input port of the clean water micro vacuum self-priming water pump is connected to the clean water inlet. The output port of the clean water micro vacuum self-priming water pump is connected to the bottom of the clean water tank. The bottom of the clean water tank is connected to the four-way interface through the third normally closed solenoid valve. One port connection;

The bottom of the quartz cuvette liquid level water tank is connected to one port of the four-way interface through the two-way quartz cuvette, and the last port of the four-way interface is connected to the waste liquid outlet through the second normally closed solenoid valve.

The liquid inlet to be tested and the clean water inlet are used to input the liquid to be tested and clean water respectively, and the waste liquid outlet is used to output waste liquid, liquid to be tested and clean water.

The controllable rotating filter six-wheel ring module is mainly composed of a stepper motor, a six-wheel filter ring, a light shielding rod and a U-shaped limit photoelectric switch. The output shaft of the stepper motor and the six-wheel filter ring axis center Coaxially fixed connection, by controlling the rotation angle of the stepper motor, adjust the rotation angle position of the six-wheel filter ring and select the filter with the required wavelength passing through the optical path on the six-wheel filter ring. The side of the six-wheel filter ring is There is a U-shaped limit photoelectric switch, and the six-wheel filter ring is radially fixed and inserted with a light-shielding rod used to block the U-shaped limit photoelectric switch during the rotation of the six-wheel filter ring. The light-shielding rod is used to block the light limit photoelectric switch to determine Rotation angle position of the six-wheel filter ring. During one rotation of the six-wheel filter ring, the shading rod will pass through the groove of the U-shaped limit photoelectric switch, so that the U-shaped limit photoelectric switch detects one rotation of the six-wheel filter ring.

The incident light intensity detection module is mainly composed of a stepper motor, a guide rail base, a photodiode, and two U-shaped limit photoelectric switches. The guide rail base is installed on the second slide rail, and the slider is embedded in the guide rail groove of the guide rail base. , the output shaft of the stepper motor is arranged horizontally and is coaxially connected to the screw. The screw passes through the horizontal through hole at the bottom of the slider. The screw and the horizontal through hole of the slider are connected through threads to form a screw nut pair;

The photodiode is installed on the slider. The guide rail groove of the guide rail base, the output shaft of the stepper motor and the screw are all perpendicular to the direction of the emitted light of the deuterium light source, so that the stepper motor drives the screw to rotate and then drives the slider and photodiode along the It moves back and forth horizontally perpendicular to the direction of the light emitted by the deuterium lamp source; there are U-shaped limit photoelectric switches on the side of the guide rail base and along the guide rail groove at the front and rear. A U-shaped limit photoelectric switch is fixed along the side of the slider to block the movement of the slider. shading stick.

The transmitted light intensity detection module uses a photodiode to detect the passing light intensity through the photodiode.

The on-site measurement instrument also includes a groundwater multi-parameter processing module. The groundwater multi-parameter processing module includes an MCU circuit, a controllable rotating filter six-wheel ring module motor drive circuit, a stepper motor slide drive circuit, and an incident light intensity photoelectric conversion circuit. , transmitted light intensity photoelectric conversion circuit, incident light intensity A/D conversion circuit and transmitted light intensity A/D conversion circuit;

The MCU circuit is connected to the motor drive circuit of the controllable rotary filter six-wheel ring module, and the MCU circuit is connected to the stepper motor slide rail drive circuit. The U-shaped limit photoelectric switch of the controllable rotary filter six-wheel ring module and the The signal output end of the U-shaped limit photoelectric switch of the incident light intensity detection module is connected to the signal receiving interface of the MCU circuit respectively;

The photodiode of the incident light intensity detection module is connected to the input end of the incident light intensity A/D conversion circuit through the output end of the incident light intensity photoelectric conversion circuit, and the output end of the incident light intensity A/D conversion circuit is connected to the fixed interface of the MCU; transmitted light intensity detection The output end of the module's transmitted light intensity photoelectric conversion circuit is connected to the input end of the transmitted light intensity A/D conversion circuit, and the output end of the transmitted light intensity A/D conversion circuit is connected to the fixed interface of the MCU.

The invention specially designs a groundwater quality multi-parameter detection device and a groundwater sample extraction and cleaning device. The groundwater sample extraction and cleaning device extracts the groundwater to be measured, and the groundwater quality multi-parameter detection device detects the groundwater to be measured. The combination of the two realizes remote control. Multi-parameter online detection of groundwater.

The present invention uses ultraviolet-visible spectrophotometry to establish a qualitative, quantitative and structural analysis method based on the absorption characteristics of material molecules in groundwater to electromagnetic waves in the range of 200nm-760nm. By selecting a light source with a wavelength range between 200nm and 700nm as the emitted light, and passing through a detection light path composed of a quartz plano-convex lens, a filter, a double-pass quartz cuvette and a photodiode, the photoelectric conversion work of groundwater quality detection is completed, and then Lambert-Beer's law is used to calculate and analyze the converted data, and finally the values of the detected parameters are obtained to complete the groundwater quality detection work.

This invention comprehensively applies the optical mechanism of ultraviolet spectrophotometry and Lambert-Beer's law, and utilizes the strong absorption characteristics of material molecules in groundwater at specific ultraviolet wavelengths to establish the relationship between the absorbance of material molecules in the ultraviolet spectrum region and the concentration of material molecules. The relationship between the two is used to directly measure the concentration of substance molecules in groundwater, and a groundwater sample extraction and cleaning device is designed to realize the functions of automatic extraction of water samples and automatic cleaning of quartz cuvettes.

The beneficial effects of the present invention are:

The present invention can remotely detect groundwater substances such as chemical oxygen demand (COD), nitrate ions, chromium ions and turbidity in groundwater quality. It gets rid of the disadvantages of traditional chemical detection of secondary environmental pollution and shortens the period of groundwater quality improvement. The testing cycle simplifies the process of groundwater quality testing and meets the need for rapid and effective detection and evaluation of groundwater contamination.

Description of the drawings

Figure 1 is a general block diagram of the measurement system of the present invention;

Figure 2 is a composition diagram of the multi-parameter detection device for groundwater quality according to the present invention;

Figure 3(a) is a side view of the controllable rotating filter six-wheel ring module;

Figure 3(b) is a schematic structural diagram of the end face of the six-wheel ring module of the controllable rotating filter;

Figure 4(a) is a side view of the incident light intensity detection module;

Figure 4(b) is a top view of the incident light intensity detection module;

Figure 5 is a composition diagram of the groundwater sample extraction and cleaning device;

Figure 6 is a graph showing the relationship between nitrate ion concentration and light absorption intensity obtained in the Example;

Figure 7 is a graph showing the relationship between chemical oxygen demand and light absorption intensity obtained in the embodiment;

Figure 8 is a graph showing the relationship between chromium ion concentration and light absorption intensity obtained in the Example.

In the picture: 1. 10 slide rails, 2 slide blocks, 3 deuterium lamps, 4 quartz plano-convex lenses, 5 controllable rotating filter six-wheel ring modules, 6 incident light intensity detection modules, 7 light shielding boxes, 8 transmitted light intensity detection modules , 9 double-pass quartz cuvette, 11 slide rail platform, 12 six-wheel filter ring, 13, 19 light shielding rod, 14, 18 stepper motor, 15 photodiode, 16 rail slider, 17 rail base, 20, 21, 22 liquid level detection sensor, 23 liquid tank to be measured, 24 quartz cuvette liquid level tank, 25 clean water tank, 26, 27 micro vacuum self-priming water pump, 29, 30, 33 normally closed solenoid valve, 31 four-way Interface, 32 liquid inlet to be tested, 34 cleaning inlet, 35 waste liquid outlet, 36 plastic water pipe, 37, 38, 39 ventilation holes.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples.

As shown in Figure 1, the specific implementation of the present invention includes on-site measurement instruments and remote control instruments, both of which are connected through wireless communication. On-site measurement instruments include groundwater quality multi-parameter detection devices and groundwater sample extraction and cleaning devices.

As shown in Figure 2, the groundwater quality multi-parameter detection device includes a slide rail platform 11, a groundwater multi-parameter processing module, a deuterium light source 3 installed on the slide rail platform 11, a quartz plano-convex lens 4, and a controllable rotating filter six-wheel ring. Module 5, incident light intensity detection module 6 and light shielding box 7; the first slide rail 1 and the second slide rail 10 are arranged front and back on the slide rail platform 11, the deuterium light source 3 is installed on the slider 2, the slider 2 is installed on On the first slide rail 1, the quartz plano-convex lens 4, the controllable rotating filter six-wheel ring module 5, the incident light intensity detection module 6 and the light shielding box 7 are all installed on the second slide rail 10 through their respective slide blocks. The convex lens 4, the controllable rotating filter six-wheel ring module 5, the incident light intensity detection module 6 and the light-shielding box 7 are arranged in sequence along the direction of the outgoing light of the deuterium lamp source 3; the light-shielding box 7 is arranged in sequence along the direction of the outgoing light of the deuterium lamp source 3 A double-pass quartz cuvette 9 and a transmitted light intensity detection module 8 are provided with a groundwater sample extraction and cleaning device. The double-pass quartz cuvette 9 contains groundwater to be measured, and the groundwater to be measured is poured into the groundwater sample extraction and cleaning device. Double-pass quartz cuvette 9 and clean it; connect the output end of the incident light intensity detection module 6 and the output end of the transmitted light intensity detection module 8 with the input end of the groundwater multi-parameter processing module through a twisted pair. The output terminal is connected to the transmitting antenna, and the transmitting antenna and the receiving antenna communicate wirelessly.

As shown in Figure 3(a) and Figure 3(b), the controllable rotating filter six-wheel ring module 5 mainly consists of a stepper motor 14, a six-wheel filter ring 12, a light shielding rod 13 and a U-shaped limit photoelectric switch. Composed of, the output shaft of the stepper motor 14 and the axis of the six-wheel filter ring 12 are coaxially fixedly connected, and the rotation angle position of the six-wheel filter ring 12 is adjusted by controlling the rotation angle of the stepper motor to select the six-wheel filter ring 12 The filter with the required wavelength of the optical path passes through it. A U-shaped limit photoelectric switch is provided on the side of the six-wheel filter ring 12. The six-wheel filter ring 12 is radially fixed with an insert for rotating in the six-wheel filter ring 12. The light-shielding rod 13 is used to block the U-shaped limit photoelectric switch.

In the specific implementation, there is a light-shielding rod 13 outside the No. 1 wheel of the six-wheel filter ring, which is used for the light-shielding limit photoelectric switch to determine the rotation position of the filter ring. Before each filter switch, rotate it to filter No. 1 and perform the filter switching action.

The filters installed on the six-wheel filter ring 12 are single-wavelength filters of different wavelengths, which match the characteristic peak wavelength of the substance, so that the filtered light wavelength is the same as the characteristic peak wavelength of the substance, and then is subsequently transmitted through When the groundwater is to be tested, the corresponding substance concentration in it is detected. The filter with the characteristic peak wavelength of the substance can be the filter with the characteristic peak wavelength corresponding to the chemical oxygen demand COD, nitrate ion, chromium ion or turbidity. The filter is installed in the controllable rotating filter. The six-piece wheel ring module 5 is on.

As shown in Figure 4(a) and Figure 4(b), the incident light intensity detection module 6 is mainly composed of a stepper motor 14, a guide rail base 17, a photodiode 15, and two U-shaped limit photoelectric switches. The guide rail base 17 is installed On the second slide rail 10, the slide block 16 is embedded in the guide rail groove of the guide rail base 17. The output shaft of the stepper motor 14 is arranged horizontally and is coaxially connected to the screw. The screw passes through the horizontal through hole at the bottom of the slide block 16. , the screw and the horizontal through hole of the slider 16 are connected through threads to form a screw nut pair; the photodiode 15 is installed on the slider 16, the guide rail groove of the guide rail base 17, the output shaft of the stepper motor 14 and the screw are all vertical In the direction of the light emitted by the deuterium lamp source 3, the stepper motor 14 is operated to drive the screw to rotate, thereby driving the slider 16 and the photodiode 15 to move back and forth horizontally along the direction perpendicular to the light emitted by the deuterium lamp source 3, for collecting the incident light intensity and After collecting, move it away to let the incident light pass; there are U-shaped limit photoelectric switches on the side of the guide rail base 17 along the guide rail groove and front and rear, and there are fixed U-shaped limit photoelectric switches along the side of the slider 16 to block the movement of the slider 16. The blackout rod 19. Every time an incident light intensity detection is required, the motor drives the slider to slide back and forth horizontally, and the sliding position is controlled by two U-shaped limit photoelectric switches.

As shown in Figure 5, the groundwater sample extraction and cleaning device includes a liquid tank to be tested 23, a quartz cuvette liquid level tank 24, a clean water tank 25, a four-way interface, three liquid level detection sensors, three normally closed solenoid valves and Two micro vacuum self-priming water pumps; the liquid water tank 23 to be tested, the quartz cuvette liquid level water tank 24 and the clean water water tank 25 are arranged at the same height, and the liquid water tank 23 to be tested, the quartz cuvette liquid level water tank 24 and the clean water water tank 25 The tops are all provided with respective ventilation holes 37, 38, and 39. The liquid tank to be tested 23, the quartz cuvette liquid level tank 24, and the clean water tank 25 are all provided with liquid level detection sensors 20, 21, and 22. The quartz cuvette is The arrangement height of the liquid level detection sensor in the liquid level water tank 24 is lower than the arrangement height of the liquid level detection sensor in the liquid water tank 23 and the clean water tank 25; the input port of the micro vacuum self-priming water pump 26 for the liquid to be tested passes through the plastic water pipe 36 and The inlet 32 of the liquid to be tested is connected to each other, and the output port of the micro vacuum self-priming water pump 26 of the liquid to be tested is connected to the bottom of the liquid to be tested water tank 23. The bottom of the liquid to be tested water tank 23 is connected to the plastic water pipe 36 and the first normally closed solenoid valve 29. Connected to one port of the four-way interface 31; the input port of the clean water micro-vacuum self-priming water pump 27 is connected to the clean water inlet 34 through the plastic water pipe 36, and the output port of the clean water micro-vacuum self-priming water pump 27 is connected to the bottom of the clean water tank 25 Interconnected, the bottom of the clean water tank 25 is connected to one port of the four-way interface 31 through the plastic water pipe 36 and the third normally closed solenoid valve 30; the bottom of the quartz cuvette liquid level water tank 24 is connected to the four-way through the double-pass quartz cuvette 9 One port of the interface 31 and the last port of the four-way interface 31 are connected to the waste liquid outlet 35 through a plastic water pipe 36 and a second normally closed solenoid valve 33 .

The on-site measurement instrument also includes a groundwater multi-parameter processing module. The groundwater multi-parameter processing module includes an MCU circuit, a controllable rotating filter six-wheel ring module motor drive circuit, a stepper motor slide drive circuit, an incident light intensity photoelectric conversion circuit, and a transmitted light Intensity photoelectric conversion circuit, incident light intensity A/D conversion circuit and transmitted light intensity A/D conversion circuit; the MCU circuit is connected to the controllable rotating filter six-wheel ring module motor drive circuit, and the MCU circuit is connected to the stepper motor slide rail drive circuit Connected, the signal output ends of the U-shaped limit photoelectric switch of the controllable rotating filter six-wheel ring module 5 and the U-shaped limit photoelectric switch of the incident light intensity detection module 6 are respectively connected to the signal receiving interface of the MCU circuit; the incident light intensity The photodiode 15 of the detection module 6 is connected to the input end of the incident light intensity A/D conversion circuit through the output end of the incident light intensity photoelectric conversion circuit, and the output end of the incident light intensity A/D conversion circuit is connected to the MCU fixed interface; the transmitted light intensity detection module 8 The output end of the transmitted light intensity photoelectric conversion circuit is connected to the input end of the transmitted light intensity A/D conversion circuit, and the output end of the transmitted light intensity A/D conversion circuit is connected to the MCU fixed interface.

The remote control instrument mainly consists of a remote receiving and transmitting device and a PC host computer. The input end of the remote receiving and transmitting device is connected to the receiving antenna, and the output end of the remote receiving and transmitting device is connected to the PC host computer.

The implementation process of the embodiment of the present invention is as follows:

1. Multi-parameter detection of groundwater quality

First, control the six-wheel filter ring module 5 to rotate to the required filter position. The deuterium lamp source 3 emits ultraviolet light, which is condensed by the quartz plano-convex lens 4 and then enters the controllable rotating filter six-wheel ring module 5. The single-wavelength light filtered by the controllable rotating filter six-wheel ring module 5 is incident on the incident light. The light intensity detection module 5 detects the incident light intensity value. When detecting the incident light intensity, in the incident light intensity detection module 5, the stepper motor 14 controls the slider 16 and the photodiode 15 on it to move to the position where the optical axis of the optical path passes, and the photodiode 15 is used for detection.

Then, it is irradiated to the double-pass quartz cuvette 9 and a part of the light is absorbed by the substances in the groundwater to be measured in the vessel. The other part of the light that passes through is irradiated to the transmitted light intensity detection module 8 to detect the transmitted light intensity value. When detecting the transmitted light intensity, in the incident light intensity detection module 5, the stepper motor 14 controls the slider 16 and the photodiode 15 on it to move away from the position where the optical axis of the light path passes, and the photodiode of the transmitted light intensity detection module 8 is used for detection. .

Then the transmitted light intensity value and the incident light intensity value are calculated in the MCU of the groundwater multi-parameter processing module to obtain the ratio of the transmitted light intensity value to the incident light intensity value. Finally, the Lambert-Beer formula is used for calculation to obtain The concentration of the substance solution in the groundwater to be measured.

2. Extract more groundwater for cleaning

As shown in Figure 5, the specific process is:

Start working, the groundwater sample extraction and cleaning device is in the water sample extraction mode: start the micro vacuum self-priming water pump 26 of the liquid to be measured, the groundwater to be measured flows in from the liquid to be measured inlet 32, and fills the liquid to be measured water tank 23, the liquid to be measured water tank The liquid level rises. When the liquid level rises to contact the liquid level detection sensor 23, the micro vacuum self-priming water pump 26 of the liquid to be measured is closed and the first normally closed electromagnetic water valve 29 is opened.

Since the water pressure of the liquid to be tested tank 23 is higher than the two-way quartz cuvette 9 and the quartz cuvette liquid level water tank 24, the liquid to be tested tank 23 will naturally move toward the two-way quartz cuvette after opening the first normally closed electromagnetic water valve 29. The cuvette 9 and the quartz cuvette liquid level water tank 24 are filled with water. When the liquid level detection sensor 21 in the quartz cuvette liquid level water tank 24 touches the liquid surface, it means that the groundwater to be measured in the double-pass quartz cuvette 9 is filled, and the water sample to be measured is completed. According to the groundwater quality multi-parameter The detection device performs multi-parameter detection of water quality.

After the water quality multi-parameter test, the groundwater sample extraction and cleaning device enters the cleaning mode: the first and second normally closed electromagnetic water valves 29 and 33 are controlled to open, and the groundwater to be tested after the water quality multi-parameter test is used as waste liquid from the waste liquid outlet. 35 flows out and the waste liquid flows out, the second normally closed electromagnetic water valve 33 is closed and the third normally closed electromagnetic water valve 30 is opened, that is, the first and third normally closed electromagnetic water valves 29 and 30 are kept open. Then, the clean water micro vacuum self-priming water pump 27 works to suck clean water from the clean water inlet 34. The clean water enters the clean water tank 25 and flows from the clean water tank 25 into the liquid to be measured tank 23 and the quartz cuvette liquid level water tank 24, and the original liquid to be measured in the water tank. The groundwater liquid is mixed to form cleaning waste liquid. If the clean water is extracted too fast, the liquid level detection sensor 22 in the clean water tank 25 may be triggered, and the clean water micro vacuum self-priming water pump 2 is turned off. When the liquid level in the clean water tank 25 does not contact the liquid level detection sensor 22, Then turn on the clean water micro vacuum self-priming water pump 2.

When the liquid level in the quartz cuvette liquid level water tank 24 contacts the liquid level detection sensor 21, the clean water micro vacuum self-priming water pump 2 and the third normally closed electromagnetic water valve 30 are closed, and the second normally closed electromagnetic water valve 2 is opened. , keep the first and second normally closed electromagnetic water valves 29 and 33 open, and let the cleaning waste liquid in the liquid water tank 23 and the quartz cuvette liquid level water tank 24 flow out. Finally, repeat the cleaning mode three times to complete the cleaning work.

Examples The relationship curves between nitrate ion, chemical oxygen demand, chromium ion concentration and absorbance are shown in Figures 6, 7 and 8. By measuring the incident light intensity and transmitted light intensity, it can be obtained by calculating the Lambert-Beer's law formula. Obtain the concentrations of the three required substances.

It can be seen that the present invention can realize remote detection of groundwater substances, and can automatically and remotely complete the extraction, cleaning and replacement of water bodies, getting rid of the disadvantages of secondary pollution of traditional technologies, greatly shortening the cycle of groundwater quality detection, and meeting the requirements of rapid Effective detection needs, the technical effect is remarkable.

Claims (2)

1. A remote groundwater multi-parameter online detection method, characterized by: sending control signals to on-site measurement instruments through remote control instruments to wake up on-site measurement instruments; on-site measurement instruments include a groundwater sample extraction and cleaning device and a groundwater water quality multi-parameter detection device The groundwater sample extraction and cleaning device extracts the groundwater to be measured, and the groundwater quality multi-parameter detection device detects the groundwater to be measured. The detection data is sent back to the remote control instrument through GSM communication, and finally the groundwater sample extraction and cleaning device cleans the water inside itself. sample channel for the next groundwater detection to be measured, thereby realizing remote multi-parameter online detection of groundwater; The described multi-parameter detection device for groundwater quality detects the groundwater to be tested, specifically: the deuterium light source emits ultraviolet light, which is condensed and then incident into a filter with a characteristic peak wavelength of the material, and is filtered to obtain the ultraviolet light that matches the material. Single-wavelength light is then transmitted through the groundwater solution to be measured. The light intensity value of the single-wavelength light before and after passing through the groundwater to be measured is detected. The ratio of the light intensity values before and after is used to calculate the Lambert-Beer formula to obtain the groundwater solution to be measured. The concentration of substances in; The on-site measuring instruments and remote control instruments are connected through wireless communication; The groundwater quality multi-parameter detection device includes a slide rail platform (11), a groundwater multi-parameter processing module, a deuterium light source (3) installed on the slide rail platform (11), a quartz plano-convex lens (4), and a controllable rotating filter. Six-wheel ring module (5), incident light intensity detection module (6) and light shielding box (7); The first slide rail (1) and the second slide rail (10) are arranged front and back on the slide rail platform (11). The deuterium light source (3) is installed on the slider (2). The slider (2) is installed on the first slide rail. On the slide rail (1), the quartz plano-convex lens (4), the controllable rotating filter six-wheel ring module (5), the incident light intensity detection module (6) and the light shielding box (7) are all installed on the slide rail (1) through their respective sliders. On the second slide rail (10), the quartz plano-convex lens (4), the controllable rotating filter six-wheel ring module (5), the incident light intensity detection module (6) and the light shielding box (7) are installed along the deuterium light source (3) The directions of the outgoing light are arranged in sequence; A double-pass quartz cuvette (9) and a transmitted light intensity detection module (8) of the groundwater sample extraction and cleaning device are arranged in the light-shielding box (7) along the direction of the emitted light of the deuterium lamp source (3). The quartz cuvette (9) contains groundwater to be measured, and the groundwater to be measured is poured into the double-pass quartz cuvette (9) by a groundwater sample extraction and cleaning device and cleaned; Connect the output end of the incident light intensity detection module (6) and the output end of the transmitted light intensity detection module (8) to the input end of the groundwater multi-parameter processing module through a twisted pair, and connect the output end of the groundwater multi-parameter processing module to the transmitting antenna. ; The remote control instrument is mainly composed of a remote receiving and transmitting device and a PC host computer. The input end of the remote receiving and transmitting device is connected to the receiving antenna, and the output end of the remote receiving and transmitting device is connected to the PC host computer; The described groundwater sample extraction and cleaning device includes a liquid tank to be tested (23), a quartz cuvette liquid level tank (24), a clean water tank (25), a four-way interface, three liquid level detection sensors, and three normally closed Solenoid valve and two micro vacuum self-priming water pumps; The liquid to be tested water tank (23), the quartz cuvette liquid level water tank (24) and the clean water water tank (25) are arranged at the same height. The liquid to be tested water tank (23), the quartz cuvette liquid level water tank (24) and the clean water water tank (25) Each has its own ventilation hole (37, 38, 39) on the top, and the liquid to be tested water tank (23), the quartz cuvette liquid level water tank (24) and the clean water water tank (25) are all equipped with liquid level detection Sensors (20, 21, 22); The input port of the micro vacuum self-priming water pump (26) for the liquid to be tested is connected to the inlet (32) of the liquid to be tested, and the output port of the micro vacuum self-priming water pump (26) for the liquid to be tested is connected to the bottom of the water tank (23) for the liquid to be tested. The connections are connected, and the bottom of the liquid tank (23) to be tested is connected to one port of the four-way interface (31) through the first normally closed solenoid valve (29); the input port and clean water inlet of the clean water micro vacuum self-priming water pump (27) (34) are connected. The output port of the clean water micro vacuum self-priming water pump (27) is connected to the bottom of the clean water tank (25). The bottom of the clean water tank (25) is connected to the four-way through the third normally closed solenoid valve (30). One port of the interface (31) is connected; the bottom of the quartz cuvette liquid level water tank (24) is connected to one port of the four-way interface (31) through the two-way quartz cuvette (9), and the last one of the four-way interface (31) The port is connected to the waste liquid outlet (35) through the second normally closed solenoid valve (33); The controllable rotating filter six-wheel ring module (5) is mainly composed of a stepper motor (14), a six-wheel filter ring (12), a light shielding rod (13) and a U-shaped limit photoelectric switch. The output shaft of the motor (14) and the axis of the six-wheel filter ring (12) are coaxially fixedly connected. By controlling the rotation angle of the stepper motor, the rotation angle position of the six-wheel filter ring (12) is adjusted and the six-wheel filter is selected. The filter with the required wavelength of the optical path passes through the ring (12). There is a U-shaped limit photoelectric switch on the side of the six-wheel filter ring (12). The six-wheel filter ring (12) is radially fixed with an insert for Block the light-shielding rod (13) of the U-shaped limit photoelectric switch during the six-round rotation of the filter ring (12); The incident light intensity detection module (6) is mainly composed of a stepper motor (14), a guide rail base (17), a photodiode (15), and two U-shaped limit photoelectric switches. The guide rail base (17) is installed on the On the second slide rail (10), the slide block (16) is embedded in the guide rail groove of the guide rail base (17). The output shaft of the stepper motor (14) is arranged horizontally and is coaxially connected to the screw. The screw passes through the slide block. (16) The horizontal through hole at the bottom, the screw and the horizontal through hole of the slider (16) are threaded to form a screw nut pair; The photodiode (15) is installed on the slider (16). The guide rail groove of the guide rail base (17), the output shaft of the stepper motor (14) and the screw are all perpendicular to the direction of the emitted light of the deuterium light source (3), so that the stepper The operation of the motor (14) drives the lead screw to rotate and then drives the slider (16) and the photodiode (15) to move back and forth horizontally in the direction perpendicular to the light emitted by the deuterium lamp source (3); the guide rail base (17) sides along the guide rail groove front and back. Each is equipped with a U-shaped limit photoelectric switch, and a light-shielding rod (19) is fixed along the side of the slider (16) for blocking the U-shaped limit photoelectric switch when the slider (16) moves; The multiple parameters include chemical oxygen demand, nitrate ions, chromium ions and turbidity. 2. A remote groundwater multi-parameter online detection method according to claim 1, characterized in that: the on-site measurement instrument also includes a groundwater multi-parameter processing module, and the groundwater multi-parameter processing module includes an MCU circuit and a controllable rotating filter. Light sheet six-wheel ring module motor drive circuit, stepper motor slide drive circuit, incident light intensity photoelectric conversion circuit, transmitted light intensity photoelectric conversion circuit, incident light intensity A/D conversion circuit and transmitted light intensity A/D conversion circuit; MCU The circuit is connected to the motor drive circuit of the controllable rotary filter six-wheel ring module, and the MCU circuit is connected to the stepper motor slide rail drive circuit. The U-shaped limit photoelectric switch of the controllable rotary filter six-wheel ring module (5) and The signal output end of the U-shaped limit photoelectric switch of the incident light intensity detection module (6) is connected to the signal receiving interface of the MCU circuit respectively; the photodiode (15) of the incident light intensity detection module (6) passes through the incident light intensity photoelectric switch. The output end of the conversion circuit is connected to the input end of the incident light intensity A/D conversion circuit, and the output end of the incident light intensity A/D conversion circuit is connected to the fixed interface of the MCU; the output end of the transmitted light intensity photoelectric conversion circuit of the transmitted light intensity detection module (8) It is connected to the input end of the transmitted light intensity A/D conversion circuit, and the output end of the transmitted light intensity A/D conversion circuit is connected to the MCU fixed interface.