CN211235521U

CN211235521U - Optical detection system with self-calibration function

Info

Publication number: CN211235521U
Application number: CN201922148936.XU
Authority: CN
Inventors: 郭二勇; 杨德刚; 王健辉; 冯慧星; 王宪华
Original assignee: BEIJING BEITAI TECHNOLOGY CO LTD
Current assignee: BEIJING BEITAI TECHNOLOGY CO LTD
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-08-11
Anticipated expiration: 2029-12-04

Abstract

The utility model provides an optical detection system with self-calibration function, which comprises an optical detection module, a detection pool module and a data acquisition and operation module; the optical detection module comprises a light source, a monochromator and a photoelectric conversion device; the detection cell module at least comprises a detection cell, at least comprises a transmission light hole position and generates relative motion with the optical detection module; the data acquisition and operation module is used for acquiring data signals of the detection cell and the transmission light hole simultaneously in the relative movement process of the optical detection module and the detection cell module and correcting the change of signal values caused by the light source so as to improve the sensitivity of the detection system.

Description

Optical detection system with self-calibration function

Technical Field

The utility model relates to a technical field such as food detection, environmental detection and medical instrument, concretely relates to take absorbance detection system of self calibration function.

Background

Absorbance is a physical quantity that measures the degree to which light is absorbed and refers to the ratio of the intensity of incident light before it passes through a solution or other substance to the intensity of transmitted light after it passes through the solution or other substance. For example, for a solution, absorbance is primarily affected by light wavelength, solution thickness, solute concentration in the solution, and the like; under certain conditions of beam wavelength and solution thickness, the absorbance is determined by the solution concentration. The method for measuring the concentration of a specific substance in a solution based on the absorbance principle is a main technical means for clinical biochemical detection, hemagglutination detection, food safety detection and environmental safety detection.

The absorbance detection system, the light source is an important device, most of the light sources at present select halogen lamps, xenon lamps, LEDs and the like, the halogen lamps have short service life and large heat productivity, and the xenon lamps have high cost and complicated control systems; compared with the first two light sources, the LED has the advantages of long service life, small volume, low cost and convenient control; however, in the detection process, the light source is gradually attenuated, the sensitivity of the system is reduced, and the fluctuation of the light source directly influences the calculation and analysis of the result and the detection accuracy.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an absorbance detection system with self calibration function to solve the problem that because the decay of light source leads to detecting system's sensitivity to reduce.

The absorbance detection system is adopted, and the structure of the absorbance detection system comprises but is not limited to an optical detection module, a detection pool module and a data acquisition and operation module; the optical detection module comprises a light source, a monochromator and a photoelectric conversion device, wherein the light source can be but is not limited to an LED, the monochromator can be but is not limited to a color filter, and the photoelectric conversion device can be but is not limited to a photodiode; further, the light source of the optical detection module is an LED, a halogen lamp, or a xenon lamp; the monochromator of the optical detection module is a color filter or a grating; the photoelectric conversion device of the optical detection module is a photoresistor, a photodiode, an APD, an MPPC or a PMT.

The detection cell module can be but is not limited to a cuvette, a microfluidic disc and the like, and is provided with a light hole as a light correction channel;

the optical detection module and the detection cell module have relative motion, the optical detection module may move relative to the detection cell module, or the detection cell module may move relative to the optical detection module, the driving structure of the relative motion may be, but is not limited to, a stepper motor, a brushless motor, etc., and the driving structure may drive the optical detection module to move, or may drive the detection cell module to move. The relative motion is a linear motion, or a circular motion.

The data acquisition and operation module comprises at least one AD acquisition channel and is connected with the optical detection module, simultaneously acquires data of the detection cell and the transmission unthreaded hole in the relative movement process of the optical detection module and the detection cell module and transmits the data to the microprocessor or the PC, and the data of the transmission unthreaded hole and the data of the detection cell are adopted for operation to correct the influence caused by light source fluctuation, so that the sensitivity of the system is improved.

The detection pool module consists of a detection disc, a light hole, a detection pool and a brushless motor.

The utility model discloses still claim the detection method of foretell system, including following step:

the light hole and the detection pool are positioned on the detection disc, the brushless motor drives the detection disc to rotate relative to the optical detection module, light emitted by the LED light source irradiates the detection disc after passing through the LED collimation small hole, the transmitted light passing through the LED collimation small hole irradiates the light hole and the detection pool in sequence in the rotation movement process of the detection disc, the transmitted light irradiates the photodiode after passing through the color filter, and the photodiode converts an optical signal into an electric signal and transmits the electric signal to the AD acquisition and operation module for processing;

and the AD acquisition and data operation module is used for simultaneously acquiring the electric signals of the light transmission hole and the detection cell after conversion by the photodiode, the signal value of the detection cell is processed by the AD acquisition and data operation module, and the processing method is used for performing ratio operation on the signal value of the detection cell and the signal value of the light transmission hole to correct the attenuation of the light source.

The utility model discloses still claim the usage of foretell system, its characterized in that is applied to food detection, environmental detection and medical instrument field.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

FIG. 1 is a block diagram of the absorbance detection system with self-calibration function according to the present invention;

FIG. 2 is a diagram showing an embodiment of the absorbance detection system with self-calibration function according to the present invention;

FIG. 3 is the data before the calibration of the LED light source of the absorbance detection system with self-calibration function of the present invention;

fig. 4 is data after the LED light source of the absorbance detection system with self-calibration function according to the present invention is calibrated.

Description of reference numerals:

a light source 11; a monochromator and photoelectric conversion device 12; a detection cell module 21; an AD acquisition and computation module 31; an LED light source 101; an LED collimation hole 102; a receiving light collimating aperture 103; a color filter 104; a photodiode 105; a detection tray 201; a light-transmitting hole 202; a detection cell 203; a brushless motor 204; and an AD acquisition and data operation module 301.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in detail with reference to the accompanying drawings and examples.

Fig. 1 is a block diagram of the structure of the absorbance detection system with self-calibration function according to the present invention, wherein the optical detection module includes a light source 11, a monochromator and a photoelectric conversion device 12; a detection cell module 21 having at least one light-transmitting hole; the AD collecting and computing module 31 collects data of the detection cell and the light hole at the same time, and corrects the light source.

Fig. 2 is an embodiment of the absorbance detection system with self-calibration function according to the present invention, wherein the LED light source 101, the LED collimating hole 102, the receiving light collimating hole 103, the color filter 104, and the photodiode 105 together form the optical detection module of this embodiment;

the detection disc 201, the light hole 202, the detection cell 203 and the brushless motor 204 together form a detection cell module of the embodiment;

the light hole 202 and the detection cell 203 are located on the detection disc 201, the brushless motor 204 drives the detection disc 201 to rotate relative to the optical detection module, light emitted by the LED light source 101 passes through the LED collimation aperture 102 and then irradiates on the detection disc 201, transmitted light passing through the LED collimation aperture 102 can sequentially irradiate on the light hole 202 and the detection cell 203 in the rotation motion process of the detection disc, the transmitted light irradiates on the photodiode 105 after passing through the color filter 104, the photodiode 105 converts an optical signal into an electrical signal and then transmits the electrical signal to the AD acquisition and operation module 301 for processing.

The AD acquisition and data operation module 301 simultaneously acquires the electrical signals of the light hole 202 and the detection cell 203 converted by the photodiode 105, and the data of the detection cell 203 without being processed is shown in fig. 3, which has an obvious phenomenon of light source attenuation; the signal value of the detection cell 203 is processed by the AD acquisition and data operation module 301, the processing method is to perform ratio operation on the signal value of the detection cell 203 and the signal value of the light hole 202, and the processed data is as shown in fig. 4, so that the attenuation of the light source is corrected.

Claims

1. An optical detection system with a self-calibration function is characterized by comprising an optical detection module, a detection pool module and a data acquisition and operation module; the optical detection module and the detection pool module can move relatively, and the data acquisition and operation module is connected with the optical detection module.

2. The system of claim 1, wherein the optical detection module comprises a light source, a monochromator, and a photoelectric conversion device; the monochromator converts light emitted by the light source into monochromatic light, and the photoelectric conversion device converts optical signals into electric signals and provides the electric signals to the data acquisition and operation module.

3. The system of claim 1, wherein the optical detection module and the detection cell module are movable relative to each other.

4. The system of claim 1, wherein the data acquisition and computation module comprises at least one channel of AD conversion channel and microprocessor unit, and is connected to the optical detection module, and is configured to simultaneously acquire data of the detection cell and the transmission aperture; the microprocessor unit corrects the fluctuation of the light source by the data of the transmission light hole to improve the sensitivity of the system.

5. The system of claim 2, wherein the light source of the optical detection module is an LED, a halogen lamp, or a xenon lamp; the monochromator of the optical detection module is a color filter or a grating; the photoelectric conversion device of the optical detection module is a photoresistor, a photodiode, an APD, an MPPC or a PMT.

6. The system of claim 3, wherein the relative motion is a brushless motor or a stepper motor driving the detection cell module to move relative to the optical detection module, or a brushless motor or a stepper motor driving the optical detection module to move relative to the detection cell module; the relative motion is a linear motion, or a circular motion.

7. The system of claim 1, wherein the detection cell of the detection cell module is a cuvette, or a microfluidic disc.

8. The system of claim 1, wherein the detection cell module comprises a detection plate, a light hole, a detection cell and a brushless motor.

9. The system of claim 1, wherein the detection cells of the detection cell module have light-transmissive holes as light-collimating passages.

10. The system according to any one of claims 1 to 8, wherein the system is used in the fields of food testing, environmental testing and medical instrumentation.