CN116165174A - Transmission type smoke meter calibrating device - Google Patents

Abstract

The invention discloses a transmission-type smoke meter calibration device, which includes an industrial computer, a measured transmission-type smoke meter, and an optical filter storage bin; the optical filter storage bin includes a storage bin body, several placement plates, and several door buckle switches The two adjacent sides of the storage bin are hollowed out, and the storage bin is provided with a rotating groove, which communicates with the adjacent two sides of the storage bin, and the rotating shaft is arranged vertically in the rotating groove, and each placing plate is arranged in order from top to bottom It is rotatably socketed on the rotating shaft, and there is a preset gap between two adjacent placement plates arranged longitudinally. There is a placement slot on the placement board, and the placement slot matches the shape of the standard filter; the placement board The side facing the interior of the storage bin is provided with a hook, which matches the shape of the door buckle switch; each door buckle switch is arranged on the inner side wall of the storage bin body at intervals longitudinally, and the door buckle switch is aligned with the position of the placement plate inside the storage bin body. correspond. The invention improves the efficiency and convenience of accessing standard optical filters.

Description

A transmission type smoke meter calibration device

technical field

The invention relates to the technical field of optical filter calibration, in particular to a transmission type smoke meter calibration device.

Background technique

In recent years, the number of motor vehicles in the country has exceeded 400 million, and motor vehicle exhaust is the main contributor to the total amount of air pollutant emissions. It is increasingly urgent to solve the problem of motor vehicle pollution. It is an inevitable requirement for environmental protection supervision to strictly enforce the environmental protection testing process of motor vehicles and ensure the authenticity and reliability of the measured values of testing instruments. The transmission smoke meter is an instrument for measuring air pollutants in motor vehicle exhaust. Its measurement principle is to measure the atmospheric pollutants in the exhaust gas according to the light transmission attenuation rate of the incident light passing through the measured smoke column. In order to ensure the stable and reliable traceability of the transmission smoke meter, it is necessary to carry out periodic measurement calibration. During the calibration process of the transmission smoke meter, it is necessary to insert the standard filter into the transmission smoke meter for calibration. Standard filters are usually stored in a storage box. At present, it is inconvenient to take a specified standard filter from the storage box. It is necessary to open the cover of the storage box, then pour out all the standard filters from the storage box, and search one by one to find the specified standard filter. The light sheet is time-consuming and laborious, which affects the calibration efficiency of the transmission opacimeter.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a transmission type opacimeter calibration device for improving the efficiency and convenience of accessing standard optical filters.

In order to achieve the above purpose, the present invention provides the following technical solutions: a transmission type smoke meter calibration device, including an industrial computer, a tested transmission smoke meter, a filter storage bin, and the measured transmission smoke meter It includes an upper computer and a lower computer, the upper computer communicates with the lower computer, and the industrial computer communicates with the lower computer and the filter storage bin respectively;

The filter storage compartment includes a storage compartment body, a number of placement plates and a number of door buttons;

The storage bin body is provided with a rotating groove, and the rotating groove communicates with the adjacent two sides of the storage bin body, and the rotating shaft is arranged vertically in the rotating groove, and each of the placement plates can be rotated sequentially from top to bottom It is socketed on the rotating shaft, and there is a preset gap between two adjacent placement plates arranged longitudinally, and a placement slot for placing a standard filter is opened on the placement board, and the placement slot Compatible with the shape of the standard optical filter, the side of the placement plate away from the inside of the storage compartment is provided with a first number, the standard optical filter is provided with a second number, and the first a number corresponding to said second number;

A draw hook is provided on the side of the placement plate facing the interior of the storage compartment, and the draw hook is adapted to the shape of the door buckle switch;

Each door buckle switch is longitudinally spaced on the inner side wall of the storage bin, and the door buckle switch corresponds to the position of the placement plate inside the storage bin;

When the placement plate is rotated and pressed toward the rotation slot, the pull hook is engaged with the door catch switch, and when the placement plate is pressed again, the pull hook is released from the door catch switch, and the door catch switch Ejecting the placement plate to the outside of the storage bin.

Further, the industrial computer includes a main control device, a display operation device, an image acquisition device, a first wireless communication device and a power supply device, the display operation device, the image acquisition device, the first wireless communication device and the The power supply device is electrically connected to the main control device, the storage bin is provided with a second wireless communication device, and the first wireless communication device is wirelessly connected to the second wireless communication device.

Further, the storage bin body is also provided with a backlight visible window and a power supply device, the power supply device is electrically connected to the backlit visible window and the second wireless communication device, and the backlit visible window is connected to the second wireless communication device. communication device.

Further, the first wireless communication device and the second wireless communication device are radio frequency transceiver modules, and the model of the radio frequency transceiver module is RF433.

Further, the upper computer is provided with a display screen, and the image acquisition device further includes an illumination source facing the display screen, and the illumination source is used to illuminate the display screen.

Further, the door buckle switch includes a shell, a buckle, a lock and a spring, the shell is provided with a guide groove, the buckle is connected to the lock, and the two ends of the spring are connected to the shell and the spring respectively. The shape of the lock buckle and the pull hook are adapted to the shape of the lock buckle.

Further, the main control device is a control chip, and the model of the control chip is STM32F417.

Further, the industrial computer also includes a storage device, connected to the main control device, for storing the first absorption ratio measurement value of each of the standard optical filters detected by the lower computer and the value of each of the standard filter optical filters. The standard reference value of the sheet, the image acquisition device is used to acquire the detection image of the tested transmission smoke meter in real time;

Then the main control device includes an image recognition unit, a first comparison unit, and a second comparison unit;

The image recognition unit is used to recognize the detected image according to an image recognition algorithm to obtain a second measured value of absorption ratio;

The first comparison unit is connected to the image recognition unit, and is used to compare the first measured value of absorptance with the standard reference value, and when the first measured value of absorptance is compared with the standard reference value, Simultaneously generating a detection instruction, and generating a calibration instruction when the first absorption ratio measurement value is different from the standard reference value;

The second comparison unit and the image recognition unit are configured to compare the second absorptance measurement value with the standard reference value, and when the second absorptance measurement value is the same as the standard reference value generating the detection instructions, and generating the calibration instructions when the second absorptance measurement differs from the standard reference value;

The lower computer continuously detects the standard filter according to the detection instruction, and automatically calibrates the precision according to the calibration instruction.

Further, the image recognition unit includes a preprocessing subunit, a noise processing subunit and a character recognition subunit;

The preprocessing subunit is used to sequentially perform image interception, image grayscale, and binarization processing on the detected image to obtain a first processed image;

The noise processing subunit is connected to the preprocessing subunit, and is used to process the noise in the first processed image according to a bilateral filtering algorithm to obtain a second processed image;

The character recognition subunit is connected to the noise processing unit, and is used to segment the second processed image into several individual characters based on a threshold, and use a template matching algorithm to identify each character to obtain the second measured value of absorption ratio.

Further, the storage device is a memory chip, the model of the memory chip is MT29F4G08, a calibration database is stored in the memory chip, and the first absorption ratio measurement value and the value are stored in the calibration database.

Beneficial effects of the present invention:

In the present invention, a plurality of door buckle switches are arranged inside the storage bin body, so that the door buckle switches can cooperate with the pull hooks on the placement plates arranged longitudinally, so that the buckle can be pressed once to store the placement board into the rotating groove, and then the buckle can be released by pressing once again. Buckle, the door buckle switch ejects the placement plate to the outside of the storage compartment, which is convenient for accessing the standard filters on the placement board, which improves the convenience of accessing the standard filters; at the same time, by setting the corresponding standard The first number of the filter is convenient for users to quickly and accurately find the specific filter to be accessed, which improves the efficiency of accessing standard filters.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of the filter storage bin in the present invention;

Fig. 2 is the schematic diagram of enlarged structure of A place among the present invention;

Fig. 3 is a schematic diagram of the external structure of the filter storage bin in the present invention;

Fig. 4 is a schematic diagram of the connection structure of the measured transmission smoke meter and the industrial computer in the present invention;

Fig. 5 is the control schematic diagram of main control device in the present invention;

Fig. 6 is a time-consuming comparison diagram of the verification methods in the present invention.

Reference signs: 1, filter storage compartment; 11, storage compartment body; 110, rotating slot; 12, placement plate; 13, door button switch; 131, shell; 133, lock; 134, spring; 14, rotating shaft ;15. Standard optical filter; 16. Pull hook; 17. Backlight visible window; 18. Charging interface; 19. Second wireless communication device; 2. Industrial computer; 21. Display operating device; 22. Industrial camera; 23. Lighting Light source; 24. First wireless communication device; 3. Upper computer; 31. Display screen; 4. Lower computer; 5. Storage device; 6. Main control device; 61. Image recognition unit; 611. Preprocessing subunit; 612 , a noise processing subunit; 613, a character recognition subunit; 62, a first comparison unit; 63, a second comparison unit.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom" and "top "Face", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

As shown in Figures 1 to 4, a transmission smoke meter calibration device in this embodiment includes an industrial computer 2, a tested transmission smoke meter, a filter storage bin 1, and a tested transmission smoke meter Including the upper computer 3 and the lower computer 4, the upper computer 3 communicates with the lower computer 4, and the industrial computer 2 communicates with the lower computer 4 and the filter storage bin 1 respectively;

The filter storage bin 1 includes a storage bin body 11, a number of placement plates 12 and a number of door buttons 13;

The storage bin body 11 is provided with a rotating groove 110, which communicates with the adjacent two sides of the storage bin body 11, and the rotating shaft 14 is arranged vertically in the rotating groove 110, and each placement plate 12 is rotatably set from top to bottom. Connected to the rotating shaft 14, there is a predetermined gap between two adjacent placement plates 12 arranged longitudinally, and a placement groove for placing the standard filter 15 is provided on the placement plate 12, and the placement groove and the standard filter 15 The shape of the place plate 12 is provided with a first number on the side away from the inside of the storage compartment, and the standard filter 15 is provided with a second number, and the first number corresponds to the second number;

The side of the placement plate 12 facing the inside of the storage compartment is provided with a draw hook 16, which is matched with the shape of the door button switch 13;

Each door buckle switch 13 is longitudinally spaced on the inner side wall of the storage bin body 11, and the door buckle switch 13 corresponds to the position of the placement plate 12 inside the storage bin body 11;

When the placement plate 12 is rotated and pressed toward the rotation groove 110, the pull hook 16 is engaged with the door buckle switch 13, and the placement plate 12 is pressed again, the pull hook 16 and the door buckle switch 13 are released, and the door buckle switch 13 ejects the placement plate 12 to the storage compartment body 11 outside.

Specifically, in this embodiment, a plurality of door button switches 13 are arranged inside the storage compartment body 11, so that the door button switches 13 can cooperate with the pull hooks 16 on each of the placement plates 12 arranged longitudinally, so as to realize pressing once to buckle and place The plate 12 is stored in the rotating groove 110, and then it is pressed once to release the release. The door catch switch ejects the plate 12 to the outside of the storage compartment 11 to facilitate access to the standard filter 15 on the plate 12, which improves the access standard filter. The convenience of the light sheet 15; at the same time, by setting the first number corresponding to the standard filter 15 on the side of the placement plate 12, it is convenient for the user to quickly and accurately find the specific filter to be accessed, which improves the access to the standard filter. Light sheet 15 efficiency. The storage bin body 11 is made of a non-magnetic material with a non-slip surface, which can be held by hand during use.

Preferably, the door button switch 13 includes a housing 131, a buckle, a lock 133 and a spring 134, the housing 131 is provided with a guide groove, the buckle is connected to the lock 133, and the two ends of the spring 134 are respectively connected to the housing 131 and the lock 133, The pull hook 16 is adapted to the shape of the lock buckle 133 .

Specifically, in this embodiment, when the placement plate 12 is pressed toward the interior of the storage compartment body 11 until the latch 133 locks the draw hook 16, the placement plate 12 is stored inside the rotating groove 110; when the placement plate 12 is pressed again, the draw hook 16 and The latch 133 is released, and the spring 134 pushes the shell 131 outward, so that the placement plate 12 is ejected to the outside of the storage bin 11 .

Preferably, the industrial computer 2 includes a main control device 6, a display operation device 21, an image acquisition device, a first wireless communication device 24 and a power supply device, and the display operation device 21, the image acquisition device, the first wireless communication device 24 and the power supply device are electrically Connected to the main control device 6 , the storage bin 11 is provided with a second wireless communication device 19 , and the first wireless communication device 24 is wirelessly connected to the second wireless communication device 19 .

Preferably, the main control device 6 is a control chip, and the model of the control chip is STM32F417. STM32F417 has abundant peripheral resources and can meet the needs of the present invention, has powerful DSP and FPU resources, is conducive to the operation of image recognition algorithm, has high-speed memory and up to 168MHZ operating frequency, is conducive to multi-task processing, and also has DCMI interface for receiving high-speed data stream of CMOS sensor camera and FMC interface for driving SRAM.

Preferably, the first wireless communication device 24 and the second wireless communication device 19 are radio frequency transceiver modules, the model of the radio frequency transceiver module is RF433, and the wireless transmission distance of the RF433 radio frequency transceiver module is more than 100 meters, which can ensure the distance of wireless communication and communication stability.

Preferably, the image acquisition module includes an industrial camera 22, and the industrial camera 22 is an OV7670 camera with a FIFO module from OmniVision, and the OV7670 is a 30W pixel CMOS image sensor. The OV7670 is controlled by the SCCB bus. In the present invention, the I2C interface of the STM32 is used to simulate the SCCB, and the main control module controls the operating parameters of the industrial camera 22 . The data transmission line of OV7670 is connected with the STM32 pin with DCMI mapping function, and the image data is directly transferred to the STM32F417 memory by using direct memory access (DMA) with double buffer processing function.

Specifically, in this embodiment, the main control device 6 is connected to the image acquisition device through the I2C interface, connected to the display operation device 21 through the USART interface, connected to the first wireless communication device 24 through the serial port, and connected to the lower computer 4 through the RS232 interface. . The image acquisition device is used to acquire the detection images of the tested transmission smoke meter in real time. There is a main control program running in the main control device 6, and the main control program builds a Qt environment in the embedded linux system, and makes a display interface to be displayed on the display operation device 21. Considering the actual needs of the system during the programming of the main control program, multi-thread programming is adopted, mainly to separate the operation interface thread from the background work thread. The background working thread can be created or destroyed according to the instructions issued by the user, so that operations such as detection control, image acquisition, and data processing can be performed in parallel. After the user sets the detection parameters, the main control program automatically communicates with the lower computer 4 to obtain relevant parameters of the tested transmission smoke meter. The main control program obtains the actual measurement value of the tested transmission smoke meter through the communication protocol as the first absorption ratio measurement value.

Preferably, the display operation device 21 is a DMG64480T035_01W DWIN 3.5-inch backlit capacitive touch screen with a resolution of 640×480 and a baud rate of 115200 for communication with the main control device 6 .

Preferably, there is a circuit board inside the industrial computer 2, and the front of the industrial computer 2 is provided with a display operation device 21 and a first wireless communication device 24, the touch display operation device 21 is connected to the internal circuit board, and the control chip is integrated on the circuit board.

Preferably, the upper computer 3 is provided with a display screen 31 , and the image acquisition device further includes an illuminating light source 23 facing the display screen 31 , and the illuminating light source 23 is used to illuminate the display screen 31 .

Specifically, in this embodiment, the tested transmission smoke meter includes a host computer 3 and a lower computer 4, the host computer 3 is used to display the actual measured value through the display screen 31, and the lower computer 4 is used to detect the actual measured value, both There is a power supply line between them, and the lower computer 4 is connected to the industrial computer 2 through the RS232 transmission line.

Preferably, the back of the industrial computer 2 is provided with an industrial camera 22, an illumination light source 23, a power supply interface and an RS232 interface. The industrial camera 22 needs to be aimed at the display screen 31 of the upper computer 3 of the smoke meter in use to collect and detect images, and the illumination light source 23 is used to illuminate the display screen 31 of the upper computer 3, the RS232 interface is the smoke meter interface, the industrial computer 2 is connected to the lower computer 4 through the RS232 transmission line, and the power interface is connected to the power supply device.

Preferably, the power supply device is responsible for supplying power for the operation of the industrial computer 2 , and the power supply device uses an isolated multi-circuit output voltage to ensure that each working module is independent of each other to reduce interference and improve the operation stability of the industrial computer 2 .

Preferably, the storage compartment body 11 is further provided with a backlight visible window 17 and a power supply device, the power supply device is electrically connected to the backlight visible window 17 and the second wireless communication device 19 , and the backlight visible window 17 is connected to the second wireless communication device 19 .

Specifically, in this embodiment, the storage bin 11 receives the standard reference value through the second wireless communication device 19 and displays it through the backlight visible window 17 . The power supply unit can also be charged through the charging port.

Preferably, as shown in Figure 5, the industrial computer 2 also includes a storage device 5, which is connected to the main control device 6, and is used to save the first absorption ratio measurement value of each standard filter 15 detected by the lower computer 4 and the first absorption ratio of each standard filter 15. The standard reference value of the light sheet 15, the storage device 5 is a memory chip, the model of the memory chip is MT29F4G08, a calibration database is stored in the memory chip, and the first absorption ratio measurement value is stored in the calibration database;

Then the main control device 6 includes an image recognition unit 61, a first comparison unit 62, and a second comparison unit 63;

The image recognition unit 61 is configured to recognize the detected image according to the image recognition algorithm to obtain the second measured value of the absorption ratio;

The first comparison unit 62 is connected to the image recognition unit 61, and is used for comparing the first absorptance measurement value with a standard reference value, and generating a detection instruction when the first absorptance measurement value is the same as the standard reference value, and when the first absorptance measurement value is the same as the standard reference value, generating a calibration command when the measured value of the absorption ratio is different from the standard reference value;

The second comparison unit 63 image recognition unit 61 is used to compare the second absorption ratio measurement value with the standard reference value, and generate a detection instruction when the second absorption ratio measurement value is the same as the standard reference value, and when the second absorption ratio measurement value is the same as the standard reference value, Generate calibration instructions when the measured value differs from the standard reference value;

The lower computer 4 continuously detects the standard filter 15 according to the detection instruction, and automatically calibrates the accuracy according to the calibration instruction.

Specifically, in this embodiment, through two comparisons and calibrations, the detection accuracy of the optical filter is effectively improved.

Preferably, the image recognition unit 61 includes a preprocessing subunit 611, a noise processing subunit 612 and a character recognition subunit 613;

The preprocessing subunit 611 is used to sequentially perform image interception, image grayscale, and binarization processing on the detected image to obtain a first processed image;

The noise processing subunit 612 is connected to the preprocessing subunit 611, and is used to process the noise in the first processed image according to the bilateral filtering algorithm to obtain the second processed image;

The character recognition subunit 613 is connected to the noise processing unit, and is used for secondly processing the image into several individual characters based on the threshold value, and using a template matching algorithm to recognize each character to obtain a second absorption ratio measurement value.

Specifically, in this embodiment, the preprocessing subunit 611 solves the image blurring problem caused by the shaking of the operating instrument by using image sharpening to process the detected image. The noise processing subunit 612 uses a bilateral filtering algorithm to effectively filter noise in the first processed image, further improving the definition of the image.

Calibration process: The inspector selects the three measurement points of high, middle and low on the industrial computer 2 to perform inspection in sequence, and each point can choose whether to inspect three times. Press the corresponding placement plate 12 in the filter storage compartment 1 to pop up the corresponding standard filter 15, insert it into the specified position of the tested transmission smoke meter, and the industrial computer 2 obtains the measured transmission smoke meter through the communication protocol. The actual measurement value is used as the first absorption ratio measurement value; the detection image of the smoke meter is obtained through the image acquisition module, and the second absorption ratio detection value is obtained by image recognition algorithm processing, which is respectively compared with the standard reference value of the absorption ratio of the standard filter 15 value for comparison. If the measurement is repeated 3 times, take the average value of the 3 indications as the detection value. Then the industrial computer 2 reads the standard reference value in the calibration database, records the result obtained by the detection and outputs the original record, if the second detection is the same as the first detection, it ends, otherwise, it automatically performs calibration and continues detection. After the test, the original record can be output as needed.

In addition, a comparative test was carried out with the manual calibration method process, and the comparative test results are shown in Figure 6, where the time-consuming calculation time includes the total time from the beginning of the detection of the smoke meter under test to the generation of the original record.

It can be seen from Figure 6 that the calibration time is shortened by about 70%, which greatly improves the calibration efficiency.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. A transmission type opacimeter calibration device, characterized in that it includes an industrial computer (2), a measured transmission type opacimeter, and a filter storage bin (1), and the measured transmission type opacimeter includes An upper computer (3) and a lower computer (4), the upper computer (3) is connected to the lower computer (4) by communication, and the industrial computer (2) is connected to the lower computer (4) and the filter by communication respectively. Light film storage compartment (1); The filter storage compartment (1) includes a storage compartment body (11), several placement plates (12) and several door latch switches (13); The storage bin body (11) is provided with a rotation groove (110), the rotation groove (110) communicates with the adjacent two sides of the storage bin body (11), and the rotation groove (110) is provided with a longitudinal The provided rotating shaft (14), each of the placing plates (12) is rotatably sleeved on the rotating shaft (14) from top to bottom in sequence, and the vertically arranged adjacent two placing plates (12) There is a preset gap between them, the placement plate (12) is provided with a placement groove for placing a standard filter (15), the placement groove is adapted to the shape of the standard filter (15), A first serial number is provided on the side of the placement plate (12) away from the storage bin (11), a second serial number is provided on the standard filter (15), and the first serial number is the same as the second serial number. Corresponding to the second number; A draw hook (16) is provided on the side of the placement plate (12) facing the interior of the storage compartment, and the draw hook (16) is adapted to the shape of the door button switch (13); Each of the door buckle switches (13) is longitudinally spaced on the inner side wall of the storage bin (11), and the door buckle switch (13) and the placement plate (12) are arranged on the inner side wall of the storage bin (11). ) corresponds to the internal position; When the placement plate (12) is rotated and pressed toward the rotation groove (110), the pull hook (16) is engaged with the door button switch (13), and the placement plate (12) is pressed again, the The pull hook (16) is released from the door button switch (13), and the door button switch (13) ejects the placement plate (12) to the outside of the storage bin body (11). 2. The transmission type smoke meter calibration device according to claim 1, characterized in that: the industrial computer (2) includes a main control device (6), a display operation device (21), an image acquisition device, a first wireless A communication device (24) and a power supply device, the display operation device (21), the image acquisition device, the first wireless communication device (24) and the power supply device are electrically connected to the main control device (6), The storage bin body (11) is provided with a second wireless communication device (19), and the first wireless communication device (24) is wirelessly connected to the second wireless communication device (19). 3. The transmission type opacimeter calibration device according to claim 2, characterized in that: the storage bin (11) is also provided with a backlight visible window (17) and a power supply device, and the power supply device is electrically connected to the The backlight visible window (17) and the second wireless communication device (19), the backlight visible window (17) is connected to the second wireless communication device (19). 4. The transmission type opacimeter calibration device according to claim 2, characterized in that: the first wireless communication device (24) and the second wireless communication device (19) are radio frequency transceiver modules, and the radio frequency The model of the transceiver module is RF433. 5. The transmission type opacimeter calibration device according to claim 1, characterized in that: the upper computer (3) is provided with a display screen (31), and the image acquisition device also includes an illumination light source (23), The illuminating light source (23) faces the display screen (31), and the illuminating light source (23) is used to illuminate the display screen (31). 6. The transmission type opacimeter calibration device according to claim 1, characterized in that: the door button switch (13) includes a housing (131), a pull rod, a lock (133) and a spring (134), the A guide groove is provided on the housing (131), the pull rod is connected to the lock buckle (133), and the two ends of the spring (134) are respectively connected to the housing (131) and the lock buckle (133). The pull hook (16) is adapted to the shape of the lock (133). 7. The transmission type opacimeter calibration device according to claim 1, characterized in that: the main control device (6) is a control chip, and the model of the control chip is STM32F417. 8. The transmission type smoke meter calibration device according to claim 1, characterized in that: the industrial computer (2) also includes a storage device (5), which is connected to the main control device (6) for storing all The first absorption ratio measurement value of each of the standard optical filters (15) detected by the lower computer (4) and the standard reference value of each of the standard optical filters (15), the image acquisition device is used for real-time Collect and obtain the detected image of the tested transmission smoke meter; Then the main control device (6) includes an image recognition unit (61), a first comparison unit (62), and a second comparison unit (63); The image recognition unit (61) is configured to recognize the detected image according to an image recognition algorithm to obtain a second measured value of absorption ratio; The first comparison unit (62) is connected to the image recognition unit (61), and is used to compare the first measured value of absorption ratio with the standard reference value, and compare the measured value of the first absorption ratio with the standard reference value, and generating a detection instruction when the standard reference value is the same, and generating a calibration instruction when the first absorptance measurement value is different from the standard reference value; The second comparison unit (63) and the image recognition unit (61) are configured to compare the second measured value of absorption ratio with the standard reference value, and compare the measured value of the second absorption ratio with the generating the detection instruction when the standard reference value is the same, and generating the calibration instruction when the second absorptance measurement value is different from the standard reference value; The lower computer (4) continuously detects the standard optical filter (15) according to the detection instruction, and automatically calibrates the precision according to the calibration instruction. 9. The transmission type opacimeter calibration device according to claim 8, characterized in that: the image recognition unit (61) includes a preprocessing subunit (611), a noise processing subunit (612) and a character recognition subunit (613); The preprocessing subunit (611) is used to sequentially perform image interception, image grayscale, and binarization processing on the detected image to obtain a first processed image; The noise processing subunit (612) is connected to the preprocessing subunit (611), and is configured to process noise in the first processed image according to a bilateral filtering algorithm to obtain a second processed image; The character recognition subunit (613) is connected to the noise processing unit, and is used to segment the second processed image into several individual characters based on a threshold value, and use a template matching algorithm to identify each of the characters to obtain the second absorption ratio measurement value. 10. The transmission type opacimeter calibration device according to claim 8, characterized in that: the storage device (5) is a memory chip, the model of the memory chip is MT29F4G08, and a calibration database is stored in the memory chip , the first absorbance ratio measurement and the stored in the calibration database.

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