CN219266069U - Device for eliminating field spectroscopic detection interference of colorimetric pool - Google Patents

Abstract

The utility model relates to a device for eliminating field spectroscopic detection interference of a colorimetric pool, which comprises a darkroom, wherein a containing cavity is formed in the darkroom, a light source component, a diffuse reflection plate and a test tube support are detachably arranged in the containing cavity, the light source component is clung to the inner side wall of the containing cavity, the diffuse reflection plate is arranged in the middle of the containing cavity, the plate surface is opposite to the light source component, the test tube support is arranged on one side of the side surface of the diffuse reflection plate, which is far away from the light source component, and the test tube support is used for installing a test tube for containing a sample; the test tube support is connected to the bottom of the darkroom through a connecting rotating part. The sample is placed in the test tube and is detected, the test tube is placed in the darkroom, the light source is arranged in the darkroom and provides illumination, and the darkroom is separated from the outside, so that external interference during detection can be effectively reduced. In addition, the rotary part is arranged under the test tube bracket for containing the sample, and when the reagent pattern is acquired, pictures at a plurality of positions can be acquired, so that the accident is avoided.

Description

Device for eliminating field spectroscopic detection interference of colorimetric pool

Technical Field

The utility model relates to the technical field of environmental monitoring, in particular to a device for eliminating field spectroscopic detection interference of a colorimetric pool.

Background

When the total phosphorus concentration information in the solution is detected, a spectrophotometer is usually used for measurement, however, the existing spectrophotometer has larger volume and is easily interfered by stray light such as sunlight, dust, electromagnetic fields and vibration of the field environment in the field detection environment, so that the spectrophotometer is limited in the field detection process of water quality, in addition, the digital image colorimetric technology is used for sampling and analyzing, only a certain position can be sampled, and certain accidental exists.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a device for eliminating the field spectroscopic detection interference of a colorimetric pool, which solves the problems that when the conventional device is used for detecting the total phosphorus concentration information in a solution, certain contingency exists, more environmental factors interfere, and the accuracy of a detection result is low.

The technical scheme for solving the technical problems is as follows: the device for eliminating the on-site spectroscopic detection interference of the colorimetric pool is characterized by comprising a darkroom, wherein a containing cavity is formed in the darkroom, a light source component, a diffuse reflection plate and a test tube support are detachably arranged in the containing cavity, the light source component is clung to the inner side wall of the containing cavity, the diffuse reflection plate is arranged in the middle of the containing cavity, the plate surface is opposite to the light source component, the test tube support is arranged on one side, far away from the light source component, of the side surface of the diffuse reflection plate, and the test tube support is used for mounting a test tube for containing a sample; the test tube support is connected to the bottom of the darkroom through a connecting rotating part.

The beneficial effects of the utility model are as follows: the sample is placed in the test tube and is detected, the test tube is placed in the darkroom, the light source is arranged in the darkroom and provides illumination, and the darkroom is separated from the outside, so that external interference during detection can be effectively reduced. In addition, the rotary part is arranged under the test tube bracket for containing the sample, and when the reagent pattern is acquired, pictures at a plurality of positions can be acquired, so that the accident is avoided. The device solves the problems that when the conventional device is used for detecting the total phosphorus concentration information in the solution, certain contingency exists, more environmental factors interfere, and the accuracy of the detection result is low.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, for the convenience of collecting the picture, the darkroom sets up to a box body, and the box body includes the detachable top cap that bottom plate, curb plate and top surface set up, and keep away from the curb plate setting of light source part on the darkroom and be operating panel, is provided with the sample frame on the operating panel.

Further, the illumination of permeating the diffuse reflection board is on the test tube, can guarantee that the light source that the LED light source board sent can be more even when shining on the test tube, and the light source part sets up to the fixed diffuse reflection board base that is provided with in bottom of LED light source board darkroom, and the diffuse reflection board is installed on the diffuse reflection board base, and the diffuse reflection board is on a parallel with the plane that the LED light source board is located.

Further, in order to ensure that the test tube can rotate, each face of the test tube can be sampled, the rotating component comprises a connecting plate, a stepping motor, a reduction gear and a transmission gear, wherein the stepping motor, the reduction gear and the transmission gear are arranged on the connecting plate, the connecting plate is fixedly arranged on a bottom plate of a darkroom, the stepping motor is fixedly connected on the connecting plate, the reduction gear is connected on an output shaft of the stepping motor, the transmission gear is rotationally connected on a rotating shaft arranged on the connecting plate, and the transmission gear is meshed with the reduction gear.

Further, in order to ensure that the test tube support is connected stably, the test tube support comprises a connecting end and a receiving end, the connecting end is connected to the center position of the transmission gear, the outer diameter of the connecting end is consistent with the inner hole diameter of the transmission gear, the receiving end is used for receiving a test tube, and the inner diameter of the receiving end is consistent with the outer diameter of the test tube.

The method for eliminating the on-site spectroscopic detection interference of the cuvette is applied to a device for eliminating the on-site spectroscopic detection interference of the cuvette, and is characterized by comprising the following steps of:

s1: placing a sample to be tested in the test tube, placing the test tube in a darkroom, starting an LED light source, and covering a top cover to form a closed space;

s2: starting the rotating part, and enabling the test tube support to rotate along with the transmission gear;

s3: shooting a test tube from a sampling frame by using a shooting tool to obtain a picture;

s4: and uploading the acquired picture to a network terminal for color extraction, analysis and storage.

Further, the network terminal is provided with a software system, the software system comprises a data recording module, a data acquisition module and a data processing module, and the data acquisition module is used for acquiring sample pictures; the data processing module takes the data of the data acquisition module to perform comparison analysis; the data recording module is used for storing the analysis result of the data analysis module.

Further, a color model is input into the data acquisition module, and the data acquisition module converts a detection area in the picture into R, G and S three-channel color information of the object to be detected through the color model.

Further, calling the data processing module to input original data information, comparing the R, G and S three-channel color data as input information with the original data information, and judging to obtain the concentration information of the total phosphorus.

Further, the raw data information comprises R, G and S three-channel color data and the total phosphorus concentration of the corresponding sample, and the raw data information is obtained through colorimetric software.

The beneficial effects of adopting the further scheme are as follows: 1. the device greatly reduces the volume of the detecting instrument, reduces the cost of the detecting instrument, effectively improves the stability of the detecting system, does not need to require harsh environment, and is very convenient to use outdoors. 2. The method combines a machine learning technology and a digital image colorimetric technology, has strong generalization capability and nonlinear mapping capability, enlarges the measuring range of organic matters and inorganic matters in the water body and improves the measuring accuracy. 3. The rotary part can measure samples at multiple positions, reduce experimental errors and effectively avoid experimental contingency

Drawings

FIG. 1 is a schematic diagram of the whole device according to an embodiment of the present utility model;

FIG. 2 is a schematic structural view of a rotary member according to an embodiment of the present utility model;

FIG. 3 is a flow diagram illustration of a software system provided by an embodiment of the present utility model;

FIG. 4 is a schematic diagram showing a fitting relationship between three channel values and total phosphorus concentration provided by an embodiment of the present utility model;

FIG. 5 is a schematic diagram of total phosphorus measurement values and actual values obtained by experiments in accordance with another embodiment of the present utility model.

In the drawings, the list of components represented by the various numbers is as follows:

the device comprises a 1-darkroom, a 101-top cover, 102-side plates, 103-bottom plates, 104-sampling frames, 2-LED light source plates, 3-diffuse reflection plates, 301-diffuse reflection plate bases, 4-test tube holders, 401-connecting ends, 402-receiving ends, 5-rotating parts, 501-connecting plates, 502-stepping motors, 503-reduction gears and 504-transmission gears.

Detailed Description

The principles and features of the present utility model are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the utility model.

Example 1

1-2, the device for eliminating the on-site spectroscopic detection interference of the cuvette comprises a darkroom 1, wherein a containing cavity is formed in the darkroom 1, a light source component, a diffuse reflection plate 3 and a test tube support 4 are detachably arranged in the containing cavity, the light source component is clung to the inner side wall of the containing cavity, the diffuse reflection plate 3 is arranged in the middle of the containing cavity, the plate surface is opposite to the light source component, the test tube support 4 is arranged on one side of the side surface of the diffuse reflection plate 3 far away from the light source component, and the test tube support 4 is used for installing a test tube for containing a sample; the test tube holder 4 is connected to the bottom of the darkroom 1 by a connecting rotary member 5. The reagent is placed in the test tube and is detected, the test tube is placed in the darkroom 1, the light source is arranged in the darkroom 1 and provides illumination, and the darkroom 1 is separated from the outside, so that external interference during detection can be effectively reduced. In addition, the rotary part 5 is arranged under the bottom of the test tube support 4 for containing the sample, and when the reagent pattern is acquired, pictures at a plurality of positions can be acquired, so that the accident is avoided. The method solves the problems that when the existing device and method detect the total phosphorus concentration information in the solution, certain contingency exists, more environmental factors interfere, and the accuracy of the detection result is low.

The darkroom 1 provided by the utility model reduces the interference of stains, fingerprints and the like outside the tube wall to experimental results to the maximum extent, and improves the measurement precision and sensitivity.

Example 2

As shown in fig. 2, in this embodiment, for convenience in taking pictures, the darkroom 1 is configured as a box, the box includes a bottom plate 103, a side plate 102 and a detachable top cover 101 disposed on a top surface, and the side plate 102 far away from the light source component on the darkroom 1 is configured as an operation panel, and a sampling frame 104 is disposed on the operation panel. The illumination of the diffuse reflection plate 3 is transmitted on the test tube, so that the light source emitted by the LED light source plate 2 can be ensured to be more uniform when being transmitted on the test tube, the light source component is arranged as the LED light source plate 2, the diffuse reflection plate base 301 is fixedly arranged at the bottom of the darkroom 1, the diffuse reflection plate base 301 is provided with a groove matched with the diffuse reflection plate 3, the diffuse reflection plate 3 can be directly clamped into the groove, the diffuse reflection plate 3 is arranged on the diffuse reflection plate base 301, and the diffuse reflection plate 3 is parallel to the plane where the LED light source plate 2 is positioned. The LED light source can ensure that the whole colorimetric device obtains continuous and stable illumination brightness. The LED light source is selected as a cold light source, the heat generated by the LED light source is small, and constant ambient temperature can be ensured. The box body adopts closed design, shields external light to the influence of this experiment. The diffuse reflection plate 3 is used for reducing directivity of the visual light source and improving illumination uniformity of the LED light source.

The diffuse reflection plate base 301 and the side plates 102 of the darkroom 1 can be manufactured by a 3D printing technology, and have the advantages of automatically, quickly, directly and accurately converting a design drawing into a model.

In order to ensure that the test tube can rotate, each surface of the test tube can be sampled, the rotating component 5 comprises a connecting plate 501, a stepping motor 502, a reduction gear 503 and a transmission gear 504, wherein the stepping motor 502, the reduction gear 503 and the transmission gear 504 are arranged on the connecting plate 501, the connecting plate 501 is fixedly arranged on the bottom plate 103 of the darkroom 1, the stepping motor 502 is fixedly connected on the connecting plate 501, the reduction gear 503 is connected on an output shaft of the stepping motor 502, the transmission gear 504 is rotationally connected on a rotating shaft arranged on the connecting plate 501, and the transmission gear 504 is connected with the reduction gear 503 in a meshed manner. In order to ensure that the test tube support 4 is connected stably, the test tube support 4 comprises a connecting end 401 and a receiving end 402, the connecting end 401 is connected to the center of the transmission gear 504, the outer diameter of the connecting end 401 is consistent with the diameter of an inner hole of the transmission gear 504, the receiving end 402 is used for receiving a test tube, and the inner diameter of the receiving end 402 is consistent with the outer diameter of the test tube.

The utility model is provided with the rotating component 5, when the stepping motor 502 outputs high-speed and low-torque rotating speed, the gear box inner structure reduction gear 503 is meshed and transmitted to form a reduction ratio, so that the high speed of the output of the stepping motor 502 can be reduced, the transmission torque is improved, and the ideal rotating effect is realized. Through this rotating member 5 can carry out the measurement of multiposition to the sample, reduce experimental error, effectively avoid the contingency of experiment.

As shown in fig. 3 to 5, in this embodiment, a method for eliminating field spectroscopic detection interference of a cuvette is applied to a device for eliminating field spectroscopic detection interference of a cuvette, and is characterized by comprising the following steps:

s1: placing a sample to be tested in the test tube, placing the test tube in the darkroom 1, starting the LED light source, and covering the top cover 101 to form a closed space;

s2: starting the rotating part 5, and rotating the test tube support along with the transmission gear 504;

s3: taking a picture of the test tube from the sampling frame 104 using a photographing tool;

s4: and uploading the acquired picture to a network terminal for color extraction, analysis and storage.

The network terminal is provided with a software system, the software system comprises a data recording module, a data acquisition module and a data processing module, and the data acquisition module is used for acquiring sample pictures; the data processing module takes the data of the data acquisition module to perform comparison analysis; the data recording module is used for storing the analysis result of the data analysis module.

The data acquisition module inputs a color model, and the data acquisition module converts a detection area in the picture into R, G and S three-channel color information of an object to be detected through the color model. And calling the data processing module to input original data information, and comparing the R, G and S three-channel color data serving as input information with the original data information to judge and obtain the concentration information of the total phosphorus. The raw data information comprises R, G and S three-channel color data and the total phosphorus concentration of the corresponding sample, and is obtained through colorimetric software.

Example 3

The specific application of the graph is that the solution to be tested adopts standard solution configured based on national standard method, and the measurement range value of the total phosphorus concentration predicted by the method is 0.04-1.80 mg/L. When the concentration is 0.12mg/L, the accuracy is more than or equal to 95%.

As shown in fig. 1, a device for eliminating interference of field spectroscopic detection of a cuvette. The LED light source board comprises a diffuse reflection board 3, an LED light source board 2, a diffuse reflection board base 301 and a sampling frame 104. The whole device adopts closed design, isolates the influence of external light to the experiment, and optical darkroom 1 sets up to a wooden box, and the rear portion in the wooden box is arranged in to the light source, adopts 3D printing material to print towards the one side of tester and forms, sets up in its middle part to sample frame 104 of 5cm size. The LED light source plate 2, the diffusion plate mount, and the diffusion reflection plate 3 are placed on the same straight line. The diffuse reflection plate 3, the LED light source plate 2 and the diffusion plate base can be stuck with double faced adhesive tape at the bottoms, so that the diffuse reflection plate is fixed in the darkroom 1, and other sticking modes can be used.

Fig. 2 shows a schematic view of the tube holder 4 of fig. 2. The tube holder 4 is made of polylactic acid material, and the top and bottom diameters thereof correspond to the outer diameter of the tube and the diameter of the inside of the transmission gear 504, respectively. The test tube holder 4 is embedded into the inner hole of the transmission gear 504, and the test tube is placed on the test tube holder 4, so that the follow-up rotation of the stepping motor 502 is completed.

As shown in fig. 2, a schematic structural view of the rotating member 5 is provided for driving the test tube to periodically rotate. Including a gear set, stepper motor 502 and connection plate 501. The gear set comprises a reduction gear 503 and a transmission gear 504, the gear set is internally composed of gears with different numbers of teeth and moduli, the output shaft of the stepping motor 502 is directly connected with the reduction gear 503, the reduction gear 503 is adopted to drive the transmission gear 504 to rotate, so that the torque is improved, and the phenomena of locked rotor, overtravel and the like are prevented. The connecting plate 501 is used for placing the large reduction gears 503 in the reduction gear 503 group on the same plane and stably driving the test tube to rotate.

As shown in fig. 3, a flow chart of a main interface of the software system is shown. The software sets a starting icon, and an operator enters a function selection interface by clicking the starting icon. The software comprises four modules, namely data acquisition, data processing, data recording and system setting. The four modules are executed concurrently, and operators enter corresponding functional modules according to different functional button prompts.

The on-site detection steps of the total phosphorus in the solution comprise:

the first step: firstly, placing the digested total phosphorus solution into a test tube, and placing the test tube on a test tube bracket 4;

step two: the LED light source plate 2 is opened and the top cover 101 of the darkroom 1 is closed.

Step three: the software system is started and a rotation command is sent to the stepper motor 502. And calling a data acquisition module to acquire a sample picture, and converting a detection area in the picture into R, G and S three-channel color information of the object to be detected through a color model. Taking a photograph of the area where the solution is located and measuring it converts the solution picture into the number of R (red channel), G (green channel), S (saturation channel). And removing the maximum and minimum values in the result, taking the residual data as experimental data, and inputting three channel quantity values into a trained neural network model in the mobile phone to obtain a concentration prediction result.

The software system refers to water quality detection software and comprises a data acquisition module, a data processing module, a data recording module and a system setting module. The main body is written by adopting QT-Android, and supports 'one-place writing and multiple-place compiling'. Can be applied to different embedded devices. The software migration cost is reduced. The image acquisition module calls the equipment camera and intercepts the related area picture to obtain the values of red, green and saturation channels through data processing. The data processing module packages the BP neural network model trained by Matlab into a dynamic link library, and then calls the dynamic link library, so that the concentration of the organic matters or inorganic matters to be detected can be predicted. The data recording module adopts an SQLite database which is widely applied to embedded equipment as a light database, and is packaged in an APK file, so that the data can be stored and reviewed without remote call. The system setting module sends a signal to the lower computer microcontroller through serial communication, the lower computer microcontroller sends pulses to the stepping motor 502 driver, and the pulses are distributed and amplified to the stepping motor 502 through the stepping motor 502 driver, so that the test tube support 4 is controlled to drive the test tube to rotate.

And step four, calling a data processing module to take R, G and S three-channel color data as input, and enabling the terminal to obtain the concentration information of total phosphorus in the solution by inputting the original data information in advance. The method can collect images of the solution to be detected by using digital equipment such as a smart phone, a CCD camera, a scanner and the like, and convert the images of the solution to be detected into color values according to color models such as RGB (red, green, blue), HSV (chromaticity, saturation, brightness) and the like, so that quantitative detection of the solution to be detected is realized, and water quality on-site detection can be realized by the method.

The specific experiment is as follows: the total phosphorus concentration of the solution is determined by obtaining the absorbance of different total phosphorus solutions through experiments. The total phosphorus solution is prepared by the instrument according to the national standard method, and the color value of the total phosphorus solution is obtained to correlate with the concentration. The method is to prepare a series of total phosphorus solutions with concentration, put the total phosphorus solutions into a device designed by the method, photograph the total phosphorus solutions to obtain color values, and record the color values in one-to-one correspondence with the concentration of the solutions to obtain original data information. Specifically, the digital image colorimetry is used as a novel colorimetric analysis method, a detection area is photographed by using a smart phone, and then the detection area in the image is converted into a color value of an object to be detected through a color model, so that quantitative detection of the object is realized. The raw data information obtained is shown in fig. 4.

Step five: and (5) saving the experimental data to a storage module of the storage, closing the device, and ending the experiment.

The rotating member 5 includes a stepping motor 502, a gear set, and a connection plate 501. The type of the middle main control microprocessor of the stepper motor 502 is ARDUINO UNO, and the running state of the rotation removing component 5 is controlled by setting the rotating system parameters in a serial communication mode. The parameters include the rotation angle, rotation speed, etc. of the rotating member 5. The gear set module employs a set of intermeshing gears to increase the torque of the stepper motor 502. The transmission gear 504 is provided with a through hole and is rotatably connected to the connection plate 501. The connection plate 501 is used to control the stepper motor 502 to drive the test tube to rotate smoothly on a plane. The integral rotating part 5 drives the motor by receiving the pulse signals transmitted by the upper computer software and drives the transmission gear 504 to rotate so as to drive the test tube support to rotate to control the rotation of the test tube. According to the detection times, corresponding subdivision is designed to control the rotation amplitude of the test tube.

The utility model develops a set of total phosphorus on-site detection method based on digital image colorimetric technology and machine learning technology, an optical darkroom 1, total phosphorus detection software, a rotating type measurement structure with interference removal and other detection systems, thereby greatly reducing the volume of a detection instrument, reducing the cost of the detection instrument and effectively improving the stability of the detection system.

The utility model combines the machine learning technology and the digital image colorimetric technology, has strong generalization capability and nonlinear mapping capability, enlarges the measuring range of organic matters and inorganic matters in the water body and improves the measuring accuracy.

The software part of the utility model adopts a modularized design, and each module has high cohesion and low coupling. The reusability, portability and stability of the program modules are very high.

The design prepares a solution with total phosphorus content of 0.12mg/L according to the national standard method, and adopts 11 measurements by the instrument and the method of the utility model, and the predicted value of each measurement is shown in figure 5.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (5)

1. A device for eliminating the interference of the field spectroscopic detection of a cuvette is characterized by comprising,

the darkroom (1), the darkroom (1) is internally provided with a containing cavity, a light source component, a diffuse reflection plate (3) and a test tube bracket (4) are detachably arranged in the containing cavity, the light source component is clung to the inner side wall of the containing cavity, the diffuse reflection plate (3) is arranged in the middle part of the containing cavity, the plate surface is right opposite to the light source component, the test tube bracket (4) is arranged on one side, far away from the light source component, of the diffuse reflection plate (3), and the test tube bracket (4) is used for installing a test tube for containing a sample; the test tube bracket (4) is connected to the bottom of the darkroom (1) through a connecting rotating part (5).

2. The device for eliminating the on-site spectroscopic detection interference of the cuvette according to claim 1, wherein the darkroom (1) is configured as a box body, the box body comprises a bottom plate (103), side plates (102) and a detachable top cover (101) arranged on the top surface, the side plates (102) of the darkroom (1) which are far away from the light source component are arranged as an operation panel, and a sampling frame (104) is arranged on the operation panel.

3. The device for eliminating the on-site spectroscopic detection interference of the cuvette according to claim 2, wherein the light source component is an LED light source board (2), a diffuse reflection board base (301) is fixedly arranged at the bottom of the darkroom (1), the diffuse reflection board (3) is installed on the diffuse reflection board base (301), and the diffuse reflection board (3) is parallel to the plane where the LED light source board (2) is located.

4. The device for eliminating the on-site spectroscopic detection interference of the cuvette according to claim 2, wherein the rotating component (5) comprises a connecting plate (501), a stepping motor (502), a reduction gear (503) and a transmission gear (504) which are arranged on the connecting plate (501), the connecting plate (501) is fixedly arranged on a bottom plate (103) of the darkroom (1), the reduction gear (503) is connected to an output shaft of the stepping motor (502), the transmission gear (504) is rotatably connected to a rotating shaft arranged on the connecting plate (501), and the transmission gear (504) is meshed with the reduction gear (503); the test tube support (4) is arranged at the center of the transmission gear (504), and the test tube support (4) can rotate along with the transmission gear (504).

5. The device for eliminating the on-site spectroscopic detection interference of the cuvette according to claim 4, wherein the cuvette holder (4) comprises a connecting end (401) and a receiving end (402), the connecting end (401) is connected to the center of the transmission gear (504), the outer diameter of the connecting end (401) is consistent with the inner diameter of the transmission gear (504), the receiving end (402) is used for receiving the cuvette, and the inner diameter of the receiving end (402) is consistent with the outer diameter of the cuvette.

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