A water color recognition device and a water color recognition method

Abstract

The present invention discloses a water color identification device and a water color identification method, including a water sample collection chamber, an LED light source array, a light energy detection unit, a data transmission unit, and a power supply; the water sample collection chamber is a cavity for storing water samples to be tested, and an LED light source array is provided on one side thereof, and a light energy detection unit is provided on the other side thereof, and the LED light source array includes a plurality of monochromatic LEDs with different luminous wavelengths, and the light emitted by the LED light source array passes through the water sample in the water sample collection chamber and is received by the light energy detection unit. The present invention adopts a plurality of monochromatic LEDs with different luminous wavelengths to form an LED light source array as a light source, so that monochromatic light of a specific wavelength passes through the water sample to be tested one by one, and the transmittance value of the monochromatic light of a specific wavelength is obtained, thereby identifying the water color, and greatly improving the efficiency and accuracy of water color detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensors, and in particular relates to a water color recognition device and a water color recognition method. Background Art

[0002] The substances that affect the color of natural water bodies mainly include plankton (such as green algae, cyanobacteria, yellow algae, diatoms, protozoa, etc.), suspended non-biological particles, etc. These substances have specific absorption of light of different wavelengths, which causes the water body to present different colors. Experienced aquaculture technicians can judge the current status and main problems of aquaculture water bodies represented by different water colors through on-site observation. Therefore, it is particularly important to observe aquaculture water bodies and distinguish between good and bad water colors for the management, maintenance and conditioning of water quality in aquaculture production. However, the observation of technicians alone is not enough to accurately identify the water color, and corresponding identification sensors need to be used for cooperation. As is the current situation in most industries in my country, few companies have carried out in-depth research and development work on water color identification sensors, the underlying core technology of the industry.

[0003] The Chinese invention patent with application number 201520999508.7 discloses a special device for rapid water color detection, including a detection rod, a groove is provided at the bottom of the detection rod, an adjustable light source and a light intensity sensor are provided on the inner wall of the groove, the light intensity of the adjustable light source is a constant value, and the frequency is a variable value, and the light intensity sensor is electrically connected to a handheld data receiver via a photoelectric converter and wires provided on the detection rod. When the detection rod of the present invention is placed in water, the groove will automatically be filled with water, and the adjustable light source will emit light of different frequencies and wavelengths. The light intensity sensor receives the light intensity absorbed by the measured water body in the groove, and measures the water color of the measured water body, thereby reducing the error caused by visually measuring the water color, and more accurately, intelligently and quickly measuring the water color of the water body. The entire device has a simple structure and low cost.

[0004] The Chinese invention patent with application number 201721256379.8 discloses a fishery water color recognition sensor, which avoids the subjectivity and uncertainty of human visual observation through quantitative identification of water color; and the bottom surface of the fishery water color recognition sensor is smooth, easy to remove dirt, and can effectively ensure the measurement effect of the color detector; the low-power design is combined with the application of solar modules to ensure long-term stable operation of the equipment; the measured parameters can be transmitted to the mobile phone in time, combined with the analysis of the mobile phone application or platform, to output water color analysis results and water diversion suggestion information; its output result, as a kind of quantitative data information, is conducive to technical personnel to make more reasonable water diversion plans.

[0005] The Chinese invention patent with application number 201521079898.2 discloses a water color identification device, which is used in the field of aquaculture. The water sample to be tested is extracted from the pool water, and the water sample to be tested is illuminated by a light source. The water sample to be tested is identified by a color recognition module, and the water color value of the water sample to be tested is obtained and directly displayed by a display module. For farmers, the operation is simple and the results are intuitive.

[0006] The Chinese invention patent with application number 201721256847.1 discloses a water color recognition device based on narrowband Internet of Things, which includes a water color recognition float and a hardware control board arranged inside the water color recognition float, and the hardware control board includes a color sensor, a NB-IOT communication module and a microcontroller unit. The present invention uses a color sensor to quantitatively identify the water color of the water body, avoiding the subjectivity and inaccuracy of judgment through naked eye observation; and the bottom surface of the water color recognition device is smooth and easy to wipe off dirt, and the color sensor always maintains a reasonable measurement distance with the water surface, and the measurement result is more accurate.

[0007] The structures of the identification sensor devices of the above patents are similar. They all emit composite light as detection light, and the color recognition electronic components read the color difference according to the RGB standard. However, the composite light contains a mixture of multiple wavelengths of light. Only by reading the absorbance of the water body to the key specific wavelength of light can the water color be accurately identified, and ordinary detection devices cannot accurately detect this data, so this extensive structure in the prior art is not sufficient to conduct instructive detection of the color of the water body, and it is even more difficult to determine what substance causes the color of the water body. Laboratory spectrometers can accurately detect the absorption spectrum of substances in water, but such devices are expensive and are generally only used in scientific research and surveys. They are difficult to promote and apply on a large scale in fisheries and aquaculture, and cannot achieve real-time monitoring of water color. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a water color identification device, including a water sample collection chamber, an LED light source array, a light energy detection unit, a data transmission unit, and a power supply; the water sample collection chamber is a cavity for storing water samples to be tested, and an LED light source array is provided on one side thereof, and a light energy detection unit is provided on the other side thereof, the LED light source array includes a number of monochromatic LEDs with different light emission wavelengths, and the light emitted by the LED light source array passes through the water sample in the water sample collection chamber and is received by the light energy detection unit; the light energy detection unit is connected to the data transmission unit, and a water inlet is also provided on the water sample collection chamber.

[0009] Preferably, a suspended particle size classification filter screen is provided in the water sample collection chamber to divide the water sample collection chamber into several layers.

[0010] Preferably, each layer of the water sample collection chamber is provided with a corresponding LED light source array, and the composition of the monochromatic LEDs in each layer of the LED light source array is the same.

[0011] Preferably, the water inlet is arranged above the water sample collection chamber, a water outlet is provided below the water sample collection chamber, and a coarse filter is provided at the water inlet.

[0012] Preferably, it further comprises a cleaning device, wherein the cleaning device comprises a backwash pump, and the backwash pump is connected to the water outlet.

[0013] Preferably, it also includes a cleaning device, which includes a dosing bin, a metering pump is provided at the bottom of the dosing bin, a transmission pipe is provided at the bottom of the metering pump, the transmission pipe is connected to the water inlet, a one-way valve is provided on the transmission pipe, and a sewage pipe is provided at the water outlet.

[0014] Preferably, the suspended particle size classification filter screen is made of corrosion-resistant material.

[0015] The present invention also provides a water color identification method, comprising the following steps:

[0016] S1 Sampling: Let the water sample enter the water sample collection chamber;

[0017] S2 Transmitted light detection: a number of monochromatic LEDs with different luminous wavelengths are used to sequentially penetrate and illuminate the water sample. Each time the transmitted light passes through the water sample, it is received by the light energy detection unit, thereby determining the transmittance of the water sample under different wavelengths of light;

[0018] S3 Water color judgment: According to the characteristics that different substances have selective absorption of light of different wavelengths, the measured water sample transmittance data is analyzed; if the transmittance of a certain wavelength of light in the water sample is low, it means that the water sample contains substances that absorb light of that specific wavelength, and the color of the water sample is then judged.

[0019] Preferably, before step S2, step S21 is also included: according to the difference in the particle size of suspended matter particles in the water sample, a graded filter screen is set in the water sample collection chamber, and the water sample collection chamber is divided into several layers, so that the suspended matter particles contained in each layer of water sample are different; in step S2, each layer of water sample is irradiated by the same LED light source array, and the light energy detection unit receives the transmitted light and measures the transmittance of each layer of water sample under different wavelengths of light; in step S3, the transmittance data of each layer of water sample is analyzed.

[0020] Preferably, before step S3, the method further includes step S31: using the monochromatic LED in step S2 to sequentially penetrate and irradiate a blank calibration solution, and the transmittance measured each time is used as a transmittance reference value of the light of the wavelength.

[0021] The advantages of the present invention are:

[0022] 1. The system uniquely adopts multiple monochromatic LEDs with different luminous wavelengths to form an LED light source array as the light source, so that the monochromatic light of the specific wavelength passes through the water sample to be tested one by one, and the transmittance value of the monochromatic light of the specific wavelength is obtained, thereby identifying the water color, which greatly improves the efficiency and accuracy of water color detection.

[0023] 2. The system has innovatively added protective coarse filtration and targeted fine filtration for water samples. Coarse filtration can filter out large particles irrelevant to water color detection at the front end of the water sample entering the sampling system to avoid pump valve and pipeline failures; targeted fine filtration can grade and filter out plankton and suspended non-biological particles of different particle sizes, causing the water sample to change its transmittance to light of different wavelengths, thereby extracting deeper and more precise data. Combined with the particle size of the screen, it can also identify the types of plankton and suspended non-biological particles that affect water color.

[0024] 3. The monochrome LED light source array and light energy detection unit in this technical solution have extremely low-cost selection, which greatly reduces the overall equipment cost. They can be deployed in large quantities in water bodies, making it easier to popularize and promote them in the aquaculture industry.

[0025] 4. The water color recognition sensor can be buried underwater for a long time, and the water color detection can be carried out continuously. The detection data can be transmitted remotely, so that the water color can be monitored remotely in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of the sensor of the present invention;

[0027] Figure 2 This is a first arrangement diagram of multiple sensors of the present invention;

[0028] Figure 3 A second arrangement diagram of multiple sensors of the present invention;

[0029] Figure 4 This is a structural diagram of the first cleaning device for the sensor of the present invention;

[0030] Figure 5 This is a structural diagram of the second cleaning device for the sensor of the present invention;

[0031] Figure 6 It is a flow chart of the water color identification method of the present invention.

[0032] In the figure: 1 water sample collection chamber, 2 LED light source array, 3 light energy detection unit, 4 water inlet, 5 suspended particle size classification filter screen, 6 water outlet, 8 backwash pump, 9 dosing chamber, 10 metering pump body, 11 transmission pipe, 12 one-way valve, 13 sewage pipe, 14 prism. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Example 1

[0034] like Figure 1 As shown, a water color identification device includes a water sample collection chamber 1, an LED light source array 2, a light energy detection unit 3, a data transmission unit and a power supply. The LED light source array 2 in this embodiment is composed of 5 monochromatic LEDs, and the light emission wavelengths are 340nm, 410nm, 560nm, 628nm and 650nm respectively. Generally, a visible light (wavelength 380nm-780nm) monochromatic LED can be selected to measure the water color. If it is necessary to measure specific microorganisms or biochemical components in the water, ultraviolet light (wavelength less than 380nm) monochromatic LED or monochromatic infrared light (wavelength greater than 780nm) LED can also be selected. When selecting a monochromatic LED that emits a specific wavelength, the wavelength is selected accordingly based on the characteristic absorption of plankton or suspended non-biological particles in the local water body, and the key spectral frequency is selected as much as possible, so that the water color of the local water body and the types of suspended particles in the water can be more efficiently identified.

[0035] The more monochromatic LEDs with different luminous wavelengths in the LED light source array 2, the higher the detection accuracy, and the more types of plankton or suspended non-biological particles that can be identified. A light energy detection unit 3 is provided on one side of the water sample collection chamber 1 that is symmetrical to the LED light source array 2; the light energy detection unit 3 is preferably a photoelectric converter that can convert the light signal into a quantifiable output signal, and the photoelectric converter is connected to the data transmission unit; the data transmission unit can be a wired collection and transmission method such as a wire in conjunction with a data receiver, or a wireless transmission method such as a data receiver in conjunction with a wireless transmission module such as 2G, 3G, 4G, 5G or a wireless network module, and the data transmission unit can amplify, convert, mathematically process, filter out noise, and then output the signal to an external analysis unit such as a computer, mobile phone, tablet, etc. in a suitable manner; the water sample collection chamber 1 is provided with a water inlet 4, and the position, shape, and number are not limited. A coarse filter is provided at the water inlet 4, which can filter out large particles such as aquatic plants and impurities that are not related to water color detection, and avoid pump valve pipeline failure. After the water sample collection chamber 1 is preset in the water body, the water sample enters the water sample collection chamber 1 through the water inlet 4; the water sample can also be collected from a specific sampling point and injected into the water sample collection chamber through the water inlet. The water sample collection chamber 1 is also provided with a suspended particle size classification filter screen 5, which is a screen or filter membrane with different apertures. In the water sample collection chamber 1, from the water sample entry end to the distal end, the aperture of the filter screen decreases, such as Figure 1As shown. The more levels of the suspended particle size classification filter screen 5 (i.e., the number of filter screens / filter membranes with different apertures), the higher the detection accuracy, and the more types of plankton or suspended non-biological particles that can be identified. In this embodiment, the suspended particle size classification filter screen 5 has two levels of filter screens, which divide the water sample collection chamber 1 into three layers from top to bottom, and each layer is provided with the same LED light source array 2. The water sample enters from the top, and a filter screen with an aperture of 0.1-0.3mm is set at the top as the first-level filter screen, and a filter screen with an aperture of 0.02-0.1mm is set at the bottom as the second-level filter screen. The suspended particle size classification filter screen 5 can filter and remove suspended animals, algae and other plankton or suspended non-biological particles of different particle sizes in a targeted manner, thereby separating the factors affecting the water color, and extracting deeper and more precise data by comparing the absorption difference characteristics of the liquid spectrum after filtering different particle sizes at the same site. The power supply of the whole device can be a storage battery or an external power supply to supply power to the LED light source array 2, the light energy detection unit 3, and the data transmission unit.

[0036] During the detection, the five monochromatic LEDs in each layer of the LED light source array 1 emit light in turn to transmit the water sample of the corresponding layer. After the photoelectric converter receives the light, the detection results are obtained through analysis and calculation as shown in Table 1 below:

[0037]

[0038] The values ​​in the table are transmittance. Since the light emission of LED will decay with the use time, the transmittance will also change, thus affecting the detection accuracy. Therefore, it is necessary to set the reference value of the transmittance in this test before the test as the standard reference for this test. The method of setting the reference value is as follows: 5 single-color LEDs penetrate and irradiate a blank calibration liquid in turn, and the transmittance measured each time is used as the transmittance reference value of the light of that wavelength, that is, 100%. The blank calibration liquid can be colorless and transparent pure water.

[0039] As can be seen from Table 1, the difference between the transmittance of the coarse filtrate with a wavelength of 340nm and the reference value is not large, indicating that the specific absorption of the light with a wavelength of 340nm by the plankton or suspended non-biological particles in the water sample is not obvious. At the same time, the effect of the two-stage fine filtration on the transmittance of the water sample is not significant, indicating that there are basically no plankton or suspended non-biological particles with specific absorption of light with a wavelength of 340nm in the water sample.

[0040] There is a significant difference between the transmittance of the coarse filtrate with a wavelength of 410nm and the benchmark value, indicating that there are plankton or suspended non-biological particles in the water sample that have obvious specific absorption of light with a wavelength of 410nm, and the transmittance of the water sample has changed significantly after the first level of fine filtration. The transmittance after the first level of fine filtration is close to the benchmark value, indicating that the first level of fine filtration has almost removed the plankton or suspended non-biological particles with obvious specific absorption of light with a wavelength of 410nm, which means that the particle size of this type of plankton or suspended non-biological particles is larger than the aperture of the first level filter screen, and their type can be determined based on their specific absorption characteristics of light with a wavelength of 410nm.

[0041] There is a significant difference between the transmittance of the coarse filtrate with a wavelength of 560nm and the benchmark value, indicating that there are plankton or suspended non-biological particles with obvious specific absorption of light at a wavelength of 560nm in the water sample, and the transmittance of the water sample changed significantly after the first level of fine filtration. There is still a significant difference between the transmittance and the benchmark value after the first level of fine filtration, indicating that the first level of fine filtration did not completely remove the plankton or suspended non-biological particles with obvious specific absorption of light at a wavelength of 560nm. There is a significant change in the transmittance of the water sample after the second level of fine filtration, and the transmittance after the second level of fine filtration is close to the benchmark value, indicating that the second level of fine filtration almost removes the plankton or suspended non-biological particles with obvious specific absorption of light at a wavelength of 560nm. In summary, there are two types of plankton or suspended non-biological particles with obvious specific absorption of light at a wavelength of 560nm in the water sample, one with a particle size larger than the aperture of the first level filter screen, and the other with a particle size smaller than the aperture of the first level filter screen but larger than the aperture of the second level filter screen.

[0042] The transmittance changes of water samples transmitted by light of wavelength 628nm and light of wavelength 659nm are similar. There is a significant difference between the transmittance of the coarse filtrate and the benchmark value. The transmittance of the water sample did not change significantly after the first-level fine filtration, but changed significantly after the second-level fine filtration and was close to the benchmark value, indicating that the second-level fine filtration almost removed the plankton or suspended non-biological particles with obvious specific absorption, indicating that there are two types of plankton or suspended non-biological particles in the water sample with obvious specific absorption for light of wavelength 628nm and light of wavelength 659nm, respectively, and their particle size is smaller than the aperture of the first-level filter screen but larger than the aperture of the second-level filter screen.

[0043] In order to improve the detection accuracy and identify more types of plankton or suspended non-biological particles, the number of monochromatic LEDs with different luminous wavelengths can be increased in a single water color recognition sensor, or the number of suspended particle size classification filter screens (i.e., the number of filter screens / filter membranes with different apertures) can be increased; the number of water color recognition sensors can also be increased, so that there are more monochromatic LEDs with different luminous wavelengths and more suspended particle size classification filter screens (i.e., the number of filter screens / filter membranes with different apertures) on the whole. Since the LED light source array 2 and the light energy detection unit 3 have extremely low-cost selection, even if multiple recognition sensors are set up, the cost of the overall solution can still be controlled at a low level. Example 2

[0044] like Figure 1-5 As shown, a water color identification device includes a water sample collection chamber 1, a monochromatic LED light source array 2, a light energy detection unit 3, a data transmission unit, a power supply and a water inlet 4. A light energy detection unit 3 is provided on a side of the water sample collection chamber 1 that is symmetrical to the LED light source array 2; the light energy detection unit 3 is preferably a photoelectric converter, which can convert an optical signal into a quantifiable output signal. A water inlet 4 and a water outlet 6 are respectively provided at the upper and lower parts of the water sample sampling chamber for collecting and discharging water samples. A coarse filter screen for coarse filtration is provided at the water inlet 4, which can filter out large particles such as algae and impurities that are not related to water color detection, thereby avoiding pump valve pipeline failure. The water sample collection chamber 1 is also provided with a suspended particle size classification filter screen 5, which is a screen or filter membrane with different apertures. The coarse filter screen and the suspended particle size classification filter screen 5 need to be cleaned regularly to avoid aperture blockage, so a cleaning device is also included. The cleaning device includes a backwash pump 8, which is connected to the water outlet 6 and can remove the attachments on the coarse filter screen and the suspended particle size classification filter screen 5 by a physical method of reverse flushing. In addition, a dosing chamber 9 can also be set, and a metering pump 10 is provided at the bottom of the dosing chamber 9, and a transmission pump is provided at the bottom of the metering pump 10. Tube 11, the transmission pipe 11 is connected with the water inlet 4, a one-way valve 12 is arranged on the transmission pipe 11, a sewage pipe 13 is arranged at the water outlet 6, the dosing chamber 9 can add acid and alkali liquid from the water inlet 4, which is used to remove sediments, residues, etc. in the device, the metering pump 10 is used to calculate and control the amount of acid and alkali liquid released, the one-way valve 12 is used to prevent backflow, and correspondingly, the coarse filter screen and the suspended particle size classification filter screen 5 are made of acid and alkali resistant and corrosion-resistant materials, including nylon or titanium alloy and other materials. The device dissolves impurities by chemical means and discharges the dissolved impurities through the sewage pipe 13.

[0045] This embodiment also provides another installation method of the suspended particle size classification filter screen 5, such as Figure 2As shown, a plurality of water sample collection chambers 1 are provided, and the water sample collection chambers 1 are made of transparent materials such as glass. Two groups of LED light source arrays 2 are spaced apart on both sides outside the water sample collection chamber 1, and each group of LED light source arrays 2 corresponds to a photoelectric converter. A suspended particle size grading filter screen 5 is provided in each water sample collection chamber 1, and each suspended particle size grading filter screen 5 divides the water sample collection chamber 1 into two layers, an upper layer and an lower layer. The suspended particle size grading filter screen 5 is used to grade plankton or suspended non-biological particles of different particle sizes in the water sample, and each layer is provided with a corresponding LED light source array 2 and a photoelectric converter, each level has a set of independent photoelectric systems, and the composition of the monochromatic LEDs in each layer of the LED light source array 2 is the same. The aperture of the suspended particle size grading filter screen 5 in each water sample collection chamber 1 is different. At the same time, it can also be as follows Figure 3 As shown, two LED light source arrays 2 are set to correspond to one photoelectric converter, and an optical element prism 14 that can change the direction of light transmission is also set between the water sample collection chamber 1 and the photoelectric converter, so that the light emitted by the LED light source arrays 2 at two different positions is transmitted to the photoelectric converter, and the light of the two groups of LED light source arrays 2 is received by a photoelectric converter, and a plurality of monochromatic LEDs with different luminous wavelengths are used to form an LED light source array as a light source, so that monochromatic light of a specific wavelength passes through the detected water sample one by one, and the transmittance value of the monochromatic light of a specific wavelength is obtained, so as to identify the water color, which greatly improves the efficiency and accuracy of water color detection. By setting an optical element to adjust the direction of light, an LED light source array can be used to transmit multiple layers of water samples, and a photoelectric converter can be used to receive light from multiple LED light source arrays, making the device structure more flexible and compact. Example 3

[0046] The present invention also provides a water color identification method, comprising the following steps:

[0047] S1 Sampling: Let the water sample enter the water sample collection chamber 1;

[0048] S2 Transmitted light detection: a plurality of monochromatic LEDs with different luminous wavelengths are sequentially used to penetrate and illuminate the water sample, and each transmitted light passing through the water sample is received by the light energy detection unit 3, thereby determining the transmittance of the water sample under different wavelengths of light;

[0049] S3 Water color judgment: According to the characteristics that different substances selectively absorb light of different wavelengths, the measured water sample transmittance data is analyzed; if the transmittance of a certain wavelength of light in the water sample is low, it means that the water sample contains substances that absorb the light of the specific wavelength, and then the color of the water sample is judged;

[0050] Before step S2, step S21 is also included: according to the difference in the size of suspended particles in the water sample, a graded filter screen is set in the water sample collection chamber 1, and the water sample collection chamber 1 is divided into several layers, so that the suspended particles contained in each layer of water sample are different; in step S2, each layer of water sample is irradiated by the same LED light source array 2, and the light energy detection unit 3 receives the transmitted light and measures the transmittance of each layer of water sample under different wavelengths of light; in step S3, the transmittance data of each layer of water sample is analyzed. The graded filter screen can perform targeted fine filtration on the water sample, graded and screen out plankton and suspended non-biological particles of different particle sizes, so that the transmittance of the water sample to light of different wavelengths changes, thereby extracting deeper and more precise data, and combined with the screen particle size, the types of plankton and suspended non-biological particles that affect the water color can also be determined.

[0051] Before step S3, the method further includes step S31: using the monochromatic LED in step S2 to sequentially penetrate and irradiate a blank calibration liquid, and using the transmittance measured each time as a transmittance reference value of the light of the wavelength, thereby preventing the LED light attenuation from affecting the detection accuracy.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for identifying water color using a water color identification device, characterized in that: The water color identification device comprises a water sample collection chamber (1), an LED light source array (2), a light energy detection unit (3), a data transmission unit, and a power supply. The water sample collection chamber (1) is a cavity for storing water samples to be tested, one side of which is provided with an LED light source array (2), and the other side of which is provided with a light energy detection unit (3). The LED light source array (2) comprises a plurality of monochromatic LEDs with different light emission wavelengths. Light emitted by the LED light source array (2) passes through the water sample in the water sample collection chamber (1) and is received by the light energy detection unit (3). The light energy detection unit (3) communicates with the data transmission unit (3). The water sample collection chamber (1) is connected to a transmission unit, a water inlet (4) is also provided on the water sample collection chamber (1), a suspended particle size classification filter screen (5) is provided in the water sample collection chamber (1), the water sample collection chamber (1) is divided into a plurality of layers, each layer of the water sample collection chamber (1) is provided with the same LED light source array (2), the composition of the single-color LED in each layer of the LED light source array (2) is the same, the water inlet (4) is arranged above the water sample collection chamber (1), a water outlet (6) is provided below the water sample collection chamber (1), and a coarse filter screen is provided at the water inlet (4); The water color identification method comprises the following steps: S1 Sampling: Let the water sample enter the water sample collection chamber (1); S2 Transmitted light detection: a plurality of monochromatic LEDs with different luminous wavelengths are sequentially used to penetrate and illuminate the water sample. Each time the transmitted light passes through the water sample, it is received by the light energy detection unit (3), thereby measuring the light transmittance of the water sample under different wavelengths of light. S3 Water color judgment: According to the characteristics that different substances selectively absorb light of different wavelengths, the measured water sample transmittance data is analyzed. If the transmittance of a certain wavelength of light in the water sample is low, it means that the water sample contains substances that absorb the light of the specific wavelength, and then the color of the water sample is judged; The method further includes step S21 before step S2: setting a suspended particle size classification filter screen (5) according to the difference in particle sizes of suspended matter particles in the water sample, wherein the suspended particle size classification filter screen (5) sequentially filters and removes suspended animals, plankton or suspended non-biological particles of different particle sizes, thereby separating the factors affecting the water color, and making the suspended matter particles contained in each layer of the water sample different; In step S2, each layer of water sample is irradiated by the same LED light source array (2), and the light energy detection unit (3) receives the transmitted light and measures the light transmittance of each layer of water sample under light of different wavelengths; In step S3, the light transmittance data of each layer of water samples is analyzed.

2. The method for water color recognition using a water color recognition device according to claim 1, characterized in that: Before step S3, the method further includes step S31: using the monochromatic LED in step S2 to sequentially penetrate and irradiate a blank calibration liquid, and the transmittance measured each time is used as a transmittance reference value of the light of the wavelength.

3. The method for water color recognition using a water color recognition device according to claim 2, characterized in that: It also comprises a cleaning device, the cleaning device comprising a backwashing pump (8), the backwashing pump (8) being connected to the water outlet (6).

4. The method for water color recognition using a water color recognition device according to claim 2, characterized in that: The invention also comprises a cleaning device, the cleaning device comprising a dosing bin (9), a metering pump (10) being provided at the bottom of the dosing bin (9), a transmission pipe (11) being provided at the bottom of the metering pump (10), the transmission pipe (11) being connected to the water inlet (4), a one-way valve (12) being provided on the transmission pipe, and a sewage discharge pipe (13) being provided at the water outlet (6).

5. The method for water color recognition using the water color recognition device according to claim 4, characterized in that: The suspended particle size classification filter screen (5) is made of corrosion-resistant material.

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