A water quality detection device and method for diffuse transmission turbidity and multi-channel colorimetry.

Abstract

This invention relates to a water quality detection device and method for diffuse transmission turbidity and multi-channel colorimetry. The device includes a sample bottle, a turbidity light source, a turbidity light source lens, a turbidity photodetector assembly, a colorimetric channel light source, a colorimetric channel filter, a colorimetric channel spectrometer, and a colorimetric channel photodetector. Light emitted from the turbidity light source passes through the turbidity light source lens and then illuminates the solution in the sample bottle; the light passing through the solution is then detected by the turbidity photodetector assembly. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter and then through the colorimetric channel spectrometer to illuminate the solution in the sample bottle; the light passing through the solution is then detected by the colorimetric channel photodetector. This invention achieves both diffuse transmission turbidity detection and colorimetric channel detection functions on a single instrument, reuses the same photodetector for multiple light sources, significantly reduces costs, and features a compact component layout and small size.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, and in particular to a water quality testing device and method for diffuse transmission turbidity and multi-channel colorimetry. Background Technology

[0002] In the field of water quality testing, photometry is widely used. The basic principle of photometry is as follows: A beam of monochromatic light of a specific wavelength is shone onto a reference or sample. After passing through the reference, the light energy is quantitatively detected and recorded by a photodetector. After passing through the sample, depending on the sample concentration, some light is absorbed, while the rest passes through the solution; the light energy can also be quantitatively detected by the photodetector. By comparing the light energy transmitted through the reference and the light energy transmitted through the sample, the concentration of the sample solution can be calculated according to Beer-Lambert's law.

[0003] Optical filters are optical devices that selectively transmit a portion of the spectrum while rejecting the rest. Narrowband filters are a type with a relatively narrow bandwidth. For example, a beam of polychromatic light passing through a narrowband filter with a dominant wavelength of 530 nm and a bandwidth of 10 nm can produce a beam with a dominant wavelength of 530 nm and a bandwidth of 10 nm. Compared to beam splitters such as prisms and gratings, this method can obtain a near-monochromatic light spectrum at a lower cost, offering high cost-effectiveness. By selecting filters with different dominant wavelengths, the desired wavelength can be obtained. Other methods to achieve near-monochromatic light include using monochromatic LEDs and multicolor LEDs. Monochromatic LEDs emit light of a "single color" when operating; multicolor LEDs have multiple pins, and energizing different pins emits light of "different colors."

[0004] A beam splitter is a type of lens capable of separating light rays according to set parameters. For example, if a beam of light is incident on a beam splitter with a transmission:reflection ratio of 8:2 at a 45° angle, 80% of the light reaching the lens will be transmitted, and 20% will be reflected. By selecting lenses with different beam splitting parameters, the desired energy of the light can be obtained. Another function of a beam splitter is to converge light rays arranged at 90° angles to the same direction.

[0005] Regarding turbidity, the instrument has a highly directional light source. The light beam emitted by the light source passes through the water sample and encounters tiny particles in the water, producing scattered light. The turbidity of the water sample is calculated by measuring the intensity of the scattered light perpendicular to the direction of the light beam and the intensity of the transmitted light after passing through the water sample. This method is called the diffuse transmission method and has a wide turbidity detection range.

[0006] Today's common water quality analyzers can detect multiple parameters. When multiple parameters use different wavelengths, one solution is to arrange multiple monochromatic LEDs and photodetectors in a circular pattern. A filter can be added in front of the LED light outlet or the photodetector to obtain better monochromatic light. Since monochromatic LEDs and multicolor LEDs are not instrument-specific light sources, they have shortcomings in some key indicators such as high directivity, long-term stability, and repeatability of repeated lighting. Therefore, they are gradually being replaced by the combination of LEDs and filters.

[0007] In current practice, the circular arrangement method is limited by the physical size of components such as LEDs and photodetectors. As the number of wavelengths increases, the overall size also needs to increase to complete a full circle. Furthermore, the increased distance between the light source and the photodetector leads to severe light signal attenuation, significantly affecting the light intensity received by the photodetector. Therefore, the overall size is also limited and cannot be arbitrarily increased. For portable instruments, an excessively large size makes miniaturization difficult and does not meet the portability requirements for outdoor testing. In the circular arrangement, each light source is opposite a photodetector. As the number of light sources increases, the number of photodetectors must also increase. High-performance photodetectors are expensive, and using more photodetectors increases the instrument's cost. Because turbidity measurement requires sophisticated equipment, most portable water quality testing instruments either only have a colorimetric module without turbidity detection functionality, or have turbidity detection functionality but limited accuracy and range, making it difficult to meet the testing needs of specific scenarios. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a water quality detection device and method for diffuse transmission turbidity and multi-channel colorimetry.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] In a first aspect, this embodiment provides a water quality detection device for diffuse transmission turbidity and multi-channel colorimetry, including a sample bottle, a turbidity light source, a turbidity light source lens, a turbidity photodetector assembly, a colorimetric channel light source, a colorimetric channel filter, a colorimetric channel spectrometer, and a colorimetric channel photodetector; the light emitted by the turbidity light source passes through the turbidity light source lens and then illuminates the solution in the sample bottle, and the light passing through the solution is detected by the turbidity photodetector assembly; the light emitted by the colorimetric channel light source passes through the colorimetric channel filter and then through the colorimetric channel spectrometer to illuminate the solution in the sample bottle, and the light passing through the solution is detected by the colorimetric channel photodetector.

[0011] The further technical solution is as follows: the turbidity photodetector assembly includes a turbidity transmission photodetector and a turbidity scattering photodetector.

[0012] The further technical solution is as follows: the number of the colorimetric channel light source, the colorimetric channel filter and the colorimetric channel beam splitter is at least one set.

[0013] The further technical solution is that the colorimetric channel light source and the colorimetric channel beam splitter are distributed at 45°.

[0014] The further technical solution is as follows: the colorimetric channel light source includes an upper colorimetric channel light source and a lower colorimetric channel light source; the colorimetric channel filter includes an upper colorimetric channel filter and a lower colorimetric channel filter; the colorimetric channel photodetector includes an upper colorimetric channel photodetector and a lower colorimetric channel photodetector; the upper colorimetric channel light source, the upper colorimetric channel filter, and the upper colorimetric channel photodetector correspond to each other; and the lower colorimetric channel light source, the lower colorimetric channel filter, and the lower colorimetric channel photodetector correspond to each other.

[0015] The further technical solution is that the colorimetric channel filter is a narrowband filter.

[0016] The further technical solution is that the colorimetric channel light source is a white LED, an ultraviolet light source, or an infrared light source.

[0017] Secondly, this embodiment provides a water quality detection method based on diffuse transmission turbidity and multi-channel colorimetry, comprising the following steps:

[0018] Determine whether the test item is a turbidity test;

[0019] For turbidity tests, the turbidity solution to be tested is placed in the sample bottle. Light emitted from the turbidity light source passes through the lens of the turbidity light source and illuminates the turbidity solution inside the sample bottle. A portion of the light passes through the turbidity solution and is detected by the turbidity transmission photodetector, where a signal value of I is detected. 透 Another portion of the scattered light was detected by a turbidity scattering photodetector, with a signal value of I. 90 ;

[0020] Based on signal value I 透 and signal value I 90 The turbidity value of the solution to be tested is calculated.

[0021] If it is not a turbidity test, then it is a colorimetric channel test. A reference solution is placed in the sample vial. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter, then through the colorimetric channel spectrometer, illuminating the reference solution in the sample vial. The light then passes through the reference solution and illuminates the colorimetric channel photodetector, which detects the photoelectric signal value I0 of the reference solution. Alternatively, the test sample solution is placed in the sample vial. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter, then through the colorimetric channel spectrometer, illuminating the test sample solution in the sample vial. The light then passes through the test sample solution and illuminates the colorimetric channel photodetector, which detects the photoelectric signal value I0 of the test sample solution. t ;

[0022] Based on the photoelectric signal value I0 of the reference solution and the photoelectric signal value I of the test sample solution t The absorbance of the sample solution to be tested is calculated, and then the concentration value is calculated according to the built-in standard curve formula.

[0023] The further technical solution is as follows: Before the step of determining whether the detection item is a turbidity item, the method further includes: sequentially filling the sample bottle with multiple sets of standard turbidity solutions with known turbidity values ​​T, and recording the signal values ​​I of the multiple sets of standard turbidity solutions at the turbidity transmission photodetector. 透 The signal value I of the turbidity scattering photodetector 90 Based on the known turbidity value T and the signal value I of the turbidity transmission photodetector of the standard turbidity solution. 透 and the signal value I of the turbidity scattering photodetector 90 According to the calculation formula T = a m ×I 90 ×b n ×I 透 Given the known turbidity value T and its corresponding I 90 and I 透 The values ​​are substituted to form an equation. Multiple sets of standard solutions can be used to obtain multiple sets of equations. The calibration coefficients a, m, b, and n are calculated by solving the equations. After obtaining the above coefficients, they are written into the program algorithm as standard calculation formulas.

[0024] The further technical solution is as follows: Before the step of determining whether the detection item is a turbidity item, the method further includes: filling the sample bottle with a reference solution and multiple sets of standard sample solutions with known concentration values ​​C, and recording the photodetector signal value I0 of the reference solution and the photodetector signal value I of the corresponding concentration standard sample solution. t Then, the absorbance A of multiple sets of concentration standard sample solutions was calculated; among them, Then, based on multiple sets of absorbance A and corresponding concentration C, the least squares method is used in Excel software to fit and generate a standard curve formula C = AK + b; where K and b are the slope and intercept of the standard curve, respectively. The standard curve formula is then written into the program algorithm as the standard calculation formula.

[0025] The advantages of this invention compared to the prior art are: it realizes the functions of diffuse transmission turbidity detection and colorimetric channel detection on the same instrument, reuses the same photodetector for multiple light sources, greatly reduces costs, and has a compact component layout and small size.

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the structure of the water quality detection device for diffuse transmission turbidity and multi-channel colorimetry provided by the present invention;

[0029] Figure 2 A schematic diagram showing the distribution of the colorimetric channel light source and the colorimetric channel beam splitter provided by the present invention;

[0030] Figure 3 This is a schematic flowchart of the water quality detection method for diffuse transmission turbidity and multi-channel colorimetry provided by the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, 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," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0038] like Figure 1 As shown, this invention discloses a specific embodiment of a water quality detection device for diffuse transmission turbidity and multi-channel colorimetry, including a sample bottle 10, a turbidity light source 20, a turbidity light source lens 30, a turbidity photodetector assembly 40, a colorimetric channel light source 50, a colorimetric channel filter 60, a colorimetric channel beam splitter 70, and a colorimetric channel photodetector 80. The light emitted from the turbidity light source 20 passes through the turbidity light source lens 30 and then illuminates the solution inside the sample bottle 10; the light passing through the solution is then detected by the turbidity photodetector assembly 40. The light emitted from the colorimetric channel light source 50 passes through the colorimetric channel filter 60 and then through the colorimetric channel beam splitter 70 to illuminate the solution inside the sample bottle 10; the light passing through the solution is then detected by the colorimetric channel photodetector 80.

[0039] Specifically, such as Figure 1 As shown, the turbidity photodetector assembly 40 includes a turbidity transmission photodetector 41 and a turbidity scattering photodetector 42. The turbidity transmission photodetector 41 is used to detect a portion of the light that passes directly through the solution to obtain a turbidity transmission signal value; the turbidity scattering photodetector 42 is used to detect another portion of the light that passes through the solution to obtain a turbidity scattering signal value. The division of labor is clear and the efficiency is high.

[0040] Specifically, in this embodiment, the number of the colorimetric channel light source 50, colorimetric channel filter 60 and colorimetric channel beam splitter 70 is at least one set, and different numbers of sets can be set according to actual needs to adapt to different application scenarios.

[0041] Specifically, such as Figure 2 As shown, the colorimetric channel light source 50 and the colorimetric channel beam splitter 70 are distributed at 45°. The 45° beam splitter directs the light rays arranged at 90° to the same direction, saving space.

[0042] Specifically, such as Figure 1As shown, the colorimetric channel light source 50 includes an upper colorimetric channel light source 51 and a lower colorimetric channel light source 52; the colorimetric channel filter 60 includes an upper colorimetric channel filter 61 and a lower colorimetric channel filter 62; and the colorimetric channel photodetector 80 includes an upper colorimetric channel photodetector 81 and a lower colorimetric channel photodetector 82. The upper colorimetric channel light source 51, the upper colorimetric channel filter 61, and the upper colorimetric channel photodetector 81 correspond to each other, and the lower colorimetric channel light source 52, the lower colorimetric channel filter 62, and the lower colorimetric channel photodetector 82 correspond to each other, thus having a dual-layer optical path structure. Furthermore, a beam splitter is used to deflect the optical path, resulting in a compact component layout and small size.

[0043] Specifically, in this embodiment, the colorimetric channel filter 60 is a narrowband filter used to filter light to obtain monochromatic light.

[0044] Specifically, in this embodiment, the colorimetric channel light source 50 is a white LED, an ultraviolet light source, or an infrared light source. Different light sources can be set according to actual needs to adapt to different application scenarios.

[0045] This invention achieves both diffuse transmission turbidity detection and colorimetric channel detection on the same instrument, reuses the same photodetector for multiple light sources, significantly reduces costs, and features a compact component layout and small size.

[0046] like Figure 3 As shown, this invention also discloses a water quality detection method based on diffuse transmission turbidity and multi-channel colorimetry, comprising the following steps:

[0047] S1, determine whether the test item is a turbidity item;

[0048] Before step S1, the process includes: sequentially filling the sample bottle with multiple sets of standard turbidity solutions with known turbidity values ​​T, and recording the signal values ​​I of the multiple sets of standard turbidity solutions at the turbidity transmission photodetector. 透 The signal value I of the turbidity scattering photodetector 90 Based on the known turbidity value T and the signal value I of the turbidity transmission photodetector of the standard turbidity solution. 透 and the signal value I of the turbidity scattering photodetector 90 According to the calculation formula T = a m ×I 90 ×b n ×I 透 Given the known turbidity value T and its corresponding I 90 and I 透The values ​​are substituted to form an equation. Multiple sets of standard solutions can be used to obtain multiple sets of equations. The calibration coefficients a, m, b, and n are calculated by solving the equations. After obtaining the above coefficients, they are written into the program algorithm of the device as standard calculation formulas.

[0049] Specifically, a series of standard solutions with known turbidity values ​​T, such as 0 NTU, 1 NTU, 10 NTU, 20 NTU, 200 NTU, 800 NTU, 1000 NTU, ..., are sequentially added to the sample bottle. The signal values ​​I of the turbidity transmission photodetector for each set of standard turbidity solutions under this device are recorded. 透 The signal value I of the turbidity scattering photodetector 90 Based on the known turbidity value T and the signal value I of the turbidity transmission photodetector of the standard solution. 透 and the signal value I of the turbidity scattering photodetector 90 According to the calculation formula T = a m ×I 90 ×b n ×I 透 Given the known turbidity value T and its corresponding I 90 and I 透 The values ​​are substituted to form an equation. Multiple sets of standard solutions can be used to obtain multiple sets of equations. The calibration coefficients a, m, b, and n are calculated by solving the equations. After obtaining the above coefficients, they are written into the program algorithm of the device as standard calculation formulas.

[0050] Prior to step S1, the process includes: filling the sample vial with a reference solution and multiple sets of standard sample solutions with known concentrations C, and recording the photodetector signal value I0 of the reference solution and the photodetector signal value I of the corresponding concentration standard sample solution. t Then, the absorbance A of multiple sets of concentration standard sample solutions was calculated; among them, Then, based on multiple sets of absorbance A and corresponding concentration C, a standard curve formula C = AK + b is generated in Excel software using the least squares method; where K and b are the slope and intercept of the standard curve, respectively. The standard curve formula is then written into the program algorithm of the device as a standard calculation formula.

[0051] Specifically, a reference solution and a series of standard solutions with known concentrations C, such as 0 mg / L, 1 mg / L, 3 mg / L, 5 mg / L, ..., are sequentially added to the sample vial. The photodetector signal value I0 of the reference solution and the photodetector signal value I of the standard sample solution at that concentration are recorded. t According to the formula Calculate the absorbance A of the standard solution at this concentration. Then, fit the concentration C of this series of standard solutions with their absorbance A values ​​using the least squares method to generate a standard curve formula C = AK + b, where K is the slope of the standard curve formula and b is the intercept of the standard curve formula. This standard curve formula is stored in the instrument's program for later use.

[0052] S2, If it is a turbidity test, the turbidity solution to be tested is placed in the sample bottle. The light emitted by the turbidity light source passes through the turbidity light source lens and illuminates the turbidity solution to be tested in the sample bottle. A portion of the light passes through the turbidity solution to be tested and is detected by the turbidity transmission photodetector, with a signal value of I. 透 Another portion of the scattered light was detected by a turbidity scattering photodetector, with a signal value of I. 90 ;

[0053] S3, based on signal value I 透 and signal value I 90 The turbidity value of the solution to be tested is calculated.

[0054] Specifically, the turbidity solution to be tested is placed in the sample bottle. Light emitted from the turbidity light source passes through the lens of the turbidity light source and illuminates the turbidity solution to be tested inside the sample bottle. The signal value I detected by the turbidity transmission photodetector is recorded. 透 The signal value I detected by the turbidity scattering photodetector 90 Then, according to the formula T = a m ×I 90 ×b n ×I 透 The turbidity value of the solution to be tested can be calculated.

[0055] S4, if not a turbidity item, is a colorimetric channel item. A reference solution is placed in the sample vial. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter, then through the colorimetric channel spectrometer, illuminating the reference solution in the sample vial. The light then passes through the reference solution and illuminates the colorimetric channel photodetector, which detects the photoelectric signal value I0 of the reference solution. Alternatively, the test sample solution is placed in the sample vial. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter, then through the colorimetric channel spectrometer, illuminating the test sample solution in the sample vial. The light then passes through the test sample solution and illuminates the colorimetric channel photodetector, which detects the photoelectric signal value I0 of the test sample solution. t ;

[0056] S5, based on the photoelectric signal value I0 of the reference solution and the photoelectric signal value I of the test sample solution. t The absorbance of the sample solution to be tested is calculated, and then the concentration value is calculated according to the built-in standard curve formula.

[0057] Specifically, a reference solution (which may require additional reagents depending on the testing requirements) is placed in the sample vial. Light emitted from either the lower or upper colorimetric channel light source is filtered to produce monochromatic light through a colorimetric channel filter, then passes through a colorimetric channel spectrometer to illuminate the reference solution in the sample vial. After passing through the sample vial, the light illuminates the lower or upper colorimetric channel photodetector, and the photoelectric signal value I0 of the reference solution is recorded. Then, the test sample solution (which may require additional reagents depending on the testing requirements) is placed in the sample vial. Light emitted from either the lower or upper colorimetric channel light source is filtered to produce monochromatic light through a colorimetric channel filter, then passes through a colorimetric channel spectrometer to illuminate the test sample solution in the sample vial. After passing through the sample vial, the light illuminates the lower or upper colorimetric channel photodetector, and the photoelectric signal value I0 of the test sample solution is recorded. t Based on the detected photoelectric signal value I0 of the reference solution and the photoelectric signal value I of the sample solution t Calculate the absorbance A, and then substitute the absorbance A into the stored standard curve formula C = AK + b to calculate the concentration value of the sample solution to be tested.

[0058] This invention achieves turbidity transmission and scattering detection technology within a relatively small size. Simultaneously, it obtains the desired monochromatic light using filters, and a 45° beam splitter directs light rays arranged at 90° angles in the same direction. Furthermore, since the response of photodetectors to different wavelengths of light is not consistent, when multiple wavelengths use the same photodetector, a phenomenon may occur where one wavelength responds appropriately while another responds too low or too high. If the response is too low, the light signal cannot be effectively detected; if it is too high, it exceeds the operating range of the photodetector, causing overexposure. In this case, using a combination of beam splitters with different splitting ratios can adjust the light intensity of each colorimetric channel. Wavelengths with high photodetector response have their light intensity reduced using a beam splitter combination, while wavelengths with low photodetector response have their light intensity increased. This ensures that the response of each wavelength of the photodetector is always at an optimal level (e.g., signal value 20000-30000), reducing the amplification factor of the analog circuit and achieving the goal of improving optical performance.

[0059] This invention features six colorimetric channels, and, where size permits, can be further expanded by adding light sources, filters, and spectrometers to achieve even more colorimetric channels, demonstrating strong applicability. Furthermore, the dominant wavelength and bandwidth of the filters can be adjusted to obtain other wavelengths and superior optical performance. For example, if a detection requirement necessitates a 420nm wavelength, a narrowband filter with a dominant wavelength of 420nm can be selected without altering the filter's dimensions or packaging, ensuring unaffected assembly. Monochromatic light can be adjusted by controlling the bandwidth of this narrowband filter (e.g., from 10nm to 8nm). A narrower bandwidth also means purer light, closer to monochromatic light, reducing deviations from Beer-Lambert's law and improving the device's optical performance. Additionally, by replacing the light source, filters, spectrometers, sample vials, and photodetectors with those suitable for the ultraviolet band, the device can be used in the ultraviolet range, demonstrating strong scalability.

[0060] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

Claims

1. A water quality detection device for diffuse transmission turbidity and multi-channel colorimetry, characterized in that, The system includes a sample bottle, a turbidity light source, a turbidity light source lens, a turbidity photodetector assembly, a colorimetric channel light source, a colorimetric channel filter, a colorimetric channel spectrometer, and a colorimetric channel photodetector. Light emitted from the turbidity light source passes through the turbidity light source lens and then illuminates the solution inside the sample bottle; the light passing through the solution is then detected by the turbidity photodetector assembly. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter and then through the colorimetric channel spectrometer to illuminate the solution inside the sample bottle; the light passing through the solution is then detected by the colorimetric channel photodetector. The system comprises at least one set of colorimetric channel light sources, colorimetric channel filters, and colorimetric channel spectrometers. The colorimetric channel light source includes an upper colorimetric channel light source and a lower colorimetric channel light source. The colorimetric channel filter includes an upper colorimetric channel filter and a lower colorimetric channel filter. The colorimetric channel photodetector includes an upper colorimetric channel photodetector and a lower colorimetric channel photodetector. The upper colorimetric channel light source, the upper colorimetric channel filter, and the upper colorimetric channel photodetector correspond to each other, and the lower colorimetric channel light source, the lower colorimetric channel filter, and the lower colorimetric channel photodetector correspond to each other. The turbidity photodetector assembly includes a turbidity transmission photodetector and a turbidity scattering photodetector. The turbidity transmission photodetector is used to detect a portion of the light that passes directly through the solution to obtain a turbidity transmission signal value. The turbidity scattering photodetector is used to detect another portion of the light that passes through the solution to obtain a turbidity scattering signal value. The colorimetric channel light source and the colorimetric channel beam splitter are distributed at 45°, and the beam splitter distributed at 45° will illuminate the light arranged at 90° in the same direction.

2. The water quality detection device for diffuse transmission turbidity and multi-channel colorimetry according to claim 1, characterized in that, The colorimetric channel filter is a narrowband filter.

3. The water quality detection device for diffuse transmission turbidity and multi-channel colorimetry according to claim 1, characterized in that, The colorimetric channel light source is a white LED, an ultraviolet light source, or an infrared light source.

4. A water quality detection method based on diffuse transmission turbidity and multi-channel colorimetry, characterized in that, Includes the following steps: Determine whether the test item is a turbidity test; For turbidity tests, the turbidity solution to be tested is placed in the sample bottle. Light emitted from the turbidity light source passes through the lens of the turbidity light source and illuminates the turbidity solution inside the sample bottle. A portion of the light passes through the turbidity solution and is detected by the turbidity transmission photodetector, where a signal value of I is detected. 透 Another portion of the scattered light was detected by a turbidity scattering photodetector, with a signal value of I. 90 ; Based on signal value I 透 and signal value I 90 The turbidity value of the solution to be tested is calculated. If it is not a turbidity item, then it is a colorimetric channel item. A reference solution is placed in the sample bottle. The light emitted by the colorimetric channel light source passes through the colorimetric channel filter, and then through the colorimetric channel beam splitter to illuminate the reference solution in the sample bottle. The light then passes through the reference solution and illuminates the colorimetric channel photodetector. The colorimetric channel photodetector detects the photoelectric signal value I0 of the reference solution. The sample solution to be tested is placed in the sample bottle. Light emitted from the colorimetric channel light source passes through the colorimetric channel filter, then through the colorimetric channel beam splitter, illuminating the sample solution inside the sample bottle. The light then passes through the sample solution and illuminates the colorimetric channel photodetector, which detects the photoelectric signal value I of the sample solution. t ; Based on the photoelectric signal value I0 of the reference solution and the photoelectric signal value I of the test sample solution t The absorbance of the sample solution to be tested is calculated, and then the concentration value is calculated according to the built-in standard curve formula.

5. The water quality detection method based on diffuse transmission turbidity and multi-channel colorimetry according to claim 4, characterized in that, Before the step of determining whether the detection item is a turbidity item, the method further includes: sequentially filling the sample bottle with multiple sets of standard turbidity solutions with known turbidity values ​​T, and recording the signal values ​​I of the multiple sets of standard turbidity solutions at the turbidity transmission photodetector. 透 The signal value I of the turbidity scattering photodetector 90 Based on the known turbidity value T and the signal value I of the turbidity transmission photodetector of the standard turbidity solution. 透 and the signal value I of the turbidity scattering photodetector 90 According to the calculation formula T = a m ×I 90 ×b n ×I 透 Given the known turbidity value T and its corresponding I 90 and I 透 The values ​​are substituted to form an equation. Multiple sets of standard solutions can be used to obtain multiple sets of equations. The calibration coefficients a, m, b, and n are calculated by solving the equations. After obtaining the above coefficients, they are written into the program algorithm as standard calculation formulas.

6. The water quality detection method based on diffuse transmission turbidity and multi-channel colorimetry according to claim 4, characterized in that, Before the step of determining whether the detection item is turbidity, the method further includes: filling the sample bottle with a reference solution and multiple sets of standard sample solutions with known concentration values ​​C, and recording the photodetector signal value I0 of the reference solution and the photodetector signal value I of the corresponding concentration standard sample solution. t Then, the absorbance A of multiple concentration standard sample solutions was calculated; among them, Then, based on multiple sets of absorbance A and corresponding concentration C, the least squares method is used in Excel software to fit and generate a standard curve formula C = AK + b; where K and b are the slope and intercept of the standard curve, respectively. The standard curve formula is then written into the program algorithm as the standard calculation formula.

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