Water quality detection system

Abstract

The utility model relates to a water quality detection system, which comprises: a first light source, which is used for irradiating a water sample to be detected in a water body sample pool with light with a wavelength range covering ultraviolet and visible light regions; the second light source is used for exciting the to-be-detected water sample to generate emitted light; the spectrum detector is used for receiving a fluorescence spectrum of the emitted light and receiving an ultraviolet visible spectrum of the transmitted light related to the first light source; the data processing equipment is used for controlling the first light source and the second light source to emit light at different time slices and calculating the water quality index of the water sample to be detected based on the fluorescence spectrum and the ultraviolet visible spectrum. Therefore, different light sources can be used for irradiating a water sample to be detected at different time slices through the water quality detection system, the collected spectrums are free from interference, and meanwhile, each spectrum can focus on different states of material components, so that the components of pollutants in water are detected as much as possible, and the detection accuracy of the water quality detection system is improved. And the precision of subsequent water quality index analysis is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water quality detection, and in particular to a water quality detection system. Background Art

[0002] With the rapid development of human society, the optimal allocation of water resources and the control of water pollution have become key research topics for the sustainable development of human society in the future.

[0003] Optimizing water resource allocation and controlling water pollution first requires establishing an online monitoring system covering a wide range of observation points (including water sources, key pollution sources, rivers and lakes, irrigation areas, reservoirs, and water diversion projects) to continuously and automatically monitor water conditions. Currently, this online monitoring system primarily monitors comprehensive indicators of water quality. Key water quality indicators are primarily measured using chemical methods. However, chemical measurement generates large amounts of chemical wastewater, which can easily cause secondary pollution and requires frequent on-site maintenance. Therefore, developing a pollution-free, highly accurate, and remotely operable water quality measurement method is a pressing technical challenge. Summary of the Invention

[0004] The present application provides a water quality detection system that can perform real-time detection of water quality with less pollution and high accuracy.

[0005] In a first aspect, the present application provides a water quality detection system, comprising: a first light source, a second light source, a spectral detector, and a data processing device. The first light source is used to irradiate the water sample to be tested with light having a wavelength range covering the ultraviolet and visible light regions. The second light source is used to excite the water sample to be tested to produce emitted light. The spectral detector is used to receive the fluorescence spectrum of the emitted light, and to receive the ultraviolet-visible spectrum of the transmitted light associated with the first light source. The data processing device is used to control the first light source and the second light source to emit light at different time slices, and to calculate the water quality index of the water sample to be tested based on the fluorescence spectrum and the ultraviolet-visible spectrum.

[0006] In this way, the water quality detection system can use two different light sources to illuminate the water sample to be tested in a time-sharing manner, and collect the spectra corresponding to the different light sources at different time slices through the same receiving optical path. Finally, the collected spectra are calculated to obtain water quality indicators. Among them, by using different light sources to illuminate the water sample to be tested at different time slices, there is no interference between the collected spectra. At the same time, each spectrum can also focus on the different states of the material components (for example, the state of absorbing light or the state of emitting light, etc.), thereby detecting as many components of pollutants in the water as possible and improving the accuracy of subsequent water quality indicator analysis.

[0007] In one possible implementation, the spectral detector is located on a first side of the water sample pool, the first light source is located on a second side of the water sample pool, and the second light source is located on a third side of the water sample pool, where the first side and the second side are opposing sides. This simple system architecture allows the spectral detector to capture both the transmitted light emitted by the first light source and passing through the water sample to be tested, as well as the emitted light generated by the water sample to be tested, reducing the complexity of the water quality detection system.

[0008] In one possible implementation, the water quality testing system further includes a first lens unit, comprising at least one collimating lens, disposed between the first light source and the water sample reservoir. The first lens unit converts light emitted by the first light source into parallel light, allowing the light to illuminate the water sample to be tested, thereby minimizing light waste.

[0009] In one possible implementation, the water quality testing system further includes a second lens unit, comprising at least one collimating lens, disposed between the second light source and the water sample reservoir. The second lens unit converts light from the second light source into parallel light, allowing the light to illuminate the water sample to be tested, thereby minimizing light waste.

[0010] In one possible implementation, the water quality detection system further includes a third lens unit, comprising at least one focusing lens, disposed between the spectral detector and the water sample reservoir. This third lens unit can focus both transmitted and emitted light onto the spectral detector, thereby avoiding light waste and improving detection accuracy.

[0011] In one possible implementation, the second light source includes an LED array, which includes at least one LED unit. Each LED unit includes a switch, an LED lamp, a filter, and an optical fiber connected in sequence, wherein the optical fibers in different LED units are coupled together. Because LED lamps emit stable light and are not easily damaged, using LED lamps as fluorescent light sources can also improve the reliability of water quality detection systems. In addition, using this LED array can also make the fluorescent light source easily expandable, and the supported range of excitation wavelengths can be conveniently increased.

[0012] In one possible implementation, different LED units emit light of different, discontinuous wavelengths. This allows the detection of light reactions of multiple components, allowing the detection results to reflect the light reactions of most or all components in the water, thereby improving the accuracy of water quality testing results.

[0013] In a possible implementation, the LED array is circular or rectangular.

[0014] In one possible implementation, the wavelength of light emitted by the first light source is continuous. This continuous wavelength allows detection of the light reactions of multiple components, enabling the detection results to reflect the light reactions of most or all components in the water, thereby improving the accuracy of water quality testing results. For example, the first light source can be a xenon lamp or a deuterium halogen lamp.

[0015] In a second aspect, the present application provides a method for water quality testing using the water quality testing system described in the first aspect, comprising: when there is no water sample to be tested in the water sample pool, controlling a first light source to irradiate the water sample pool, and obtaining a first ultraviolet-visible spectrum related to the first light source through spectral detection; when there is a water sample to be tested in the water sample pool, controlling the first light source and the second light source to irradiate the water sample pool at different time slices, and obtaining a second ultraviolet-visible spectrum related to the first light source and a second fluorescence spectrum related to the second light source through spectral detection; and determining the water quality index of the water sample to be tested based on the first ultraviolet-visible spectrum, the second ultraviolet-visible spectrum and the second fluorescence spectrum.

[0016] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of an application scenario of a water quality detection system provided in an embodiment of the present application;

[0018] Figure 2 This is a schematic structural diagram of a water quality detection system provided in an embodiment of the present application;

[0019] Figure 3 This is a schematic structural diagram of a fluorescent light source provided in an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the arrangement of an LED array in a fluorescent light source provided in an embodiment of the present application;

[0021] Figure 5 This is a structural diagram of a data processing device provided in an embodiment of the present application;

[0022] Figure 6 This is a schematic structural diagram of another water quality detection system provided in an embodiment of the present application;

[0023] Figure 7 This is a structural diagram of another water quality detection system provided in an embodiment of the present application;

[0024] Figure 8 Schematic diagram of the structure of another water quality detection system provided in an embodiment of the present application;

[0025] Figure 9 This is a schematic diagram of the use process of a water quality detection system provided in an embodiment of the present application at different stages. DETAILED DESCRIPTION

[0026] The term "and / or" as used herein describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. The symbol " / " as used herein indicates that the related objects are in an "or" relationship, for example, A / B means either A or B.

[0027] The terms "first" and "second" in this specification and claims are used to distinguish different objects rather than to describe a specific order of objects. For example, "first response message" and "second response message" are used to distinguish different response messages rather than to describe a specific order of response messages.

[0028] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0029] In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more, for example, multiple processing units means two or more processing units, etc.; multiple elements means two or more elements, etc.

[0030] In the description of the embodiments of the present application, the water quality detection system is mainly used to monitor comprehensive indicators of water quality, such as turbidity, chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), chlorophyll, blue algae, green algae, etc. The water quality detection system can be but is not limited to being configured at water observation points such as rivers, lakes, reservoirs, irrigation areas, water diversion projects, or water quality monitoring points such as factory sewage outlets and the end of urban domestic wastewater pipe networks. For example, Figure 1 As shown in the figure, the water quality detection system is used to detect the water quality of the factory sewage outlet. Figure 1In the test, the water quality detection system is configured on the downstream side of the factory sewage outlet. Before the sewage discharged from the factory flows into the river through the drainage pipe, the water quality of the sewage can be tested by the water quality detection system. During the test, an appropriate amount of water sample to be tested can be extracted from the drainage pipe; then, the water sample to be tested can be tested by the water quality detection system; finally, after the test is completed, the water sample can be discharged into the drainage pipe. Of course, it can also be discharged into other pipes, which is not limited here. For other application scenarios, please refer to Figure 1 The application scenarios shown are not described here one by one.

[0031] In this embodiment, to avoid secondary contamination during water quality monitoring, the water quality detection system uses spectral detection. Spectral detection primarily utilizes ultraviolet, visible, or near-infrared light to interact with pollutants in water. The concentration of pollutants is then inferred by measuring their absorption of light (or the resulting fluorescence or Raman scattering).

[0032] The water quality detection system provided by the embodiment of the present application is introduced below. Among them, the water quality detection system provided in the present embodiment mainly utilizes two different light sources to time-share illuminate the water sample (i.e. the water sample to be tested), and collects the spectrum corresponding to the different light sources at different time slices through the same receiving light path, and finally calculates the collected spectrum to obtain water quality indicators. Since some of the material components in the water sample absorb light, while others emit light, if a single light source is used, the collected spectrum will interfere with each other. Therefore, by using different light sources to illuminate the water sample at different time slices, it is possible to prevent interference between the collected spectra, and it is also possible to make each spectrum focus on the different states of the material components (for example, the state of absorbing light or the state of emitting light, etc.), thereby detecting as many components of pollutants in the water as possible and improving the accuracy of subsequent water quality index analysis.

[0033] For example, Figure 2 FIG. 1 shows a schematic diagram of the structure of a water quality detection system provided in an embodiment of the present application. Figure 2 As shown, the water quality detection system 200 includes: an ultraviolet-visible light source 210, a fluorescent light source 220, a spectrum detector 230, a data processing device 240 and a water sample pool 250.

[0034] The UV-visible light source 210 refers to a light source capable of emitting wavelengths encompassing both the ultraviolet and visible regions, such as a xenon lamp or a deuterium-halogen lamp. Because different components in water absorb light of different wavelengths to varying degrees, the UV-visible light source 210 may be capable of emitting light of a continuous wavelength to detect the reactions of multiple components to light. This continuous wavelength light allows detection of the reactions of multiple components to light, enabling the detection results to reflect the photoreactions of most or all components in the water, thereby improving the accuracy of water quality testing. For example, continuous wavelength light may refer to light with a continuous distribution of spectral components within a certain range, characterized by a series of photons with wavelengths ranging from longer to shorter wavelengths, rather than discrete, specific wavelengths. Of course, detection can also be performed using light emitted by the UV-visible light source 210 at a single wavelength, depending on the specific circumstances and not limited herein. For example, the spectrum of light absorbed by the UV-visible light source 210 upon its interaction with the water may be referred to as the "UV-visible spectrum." For example, the UV-visible light source 210 may also be referred to as the "first light source."

[0035] The fluorescent light source 220 refers to a light source that can excite the material components in the water to emit fluorescence, such as a high-pressure mercury lamp, a light emitting diode (LED) lamp, etc. Since different wavelengths of excitation light can induce different material components in the water to produce different emission lights, in order to be able to detect the reactions of multiple material components to light, the fluorescent light source 220 can have the ability to emit light of different wavelengths. In this way, the reactions of multiple material components to light can be detected by light of different wavelengths, so that the detected results can reflect the light reactions of most or all material components in the water, thereby improving the accuracy of the water quality detection results. Since each wavelength of excitation light can react with the water body to produce a fluorescence spectrum of emission light of a series of wavelengths, the series of wavelengths of excitation light produces a matrix of fluorescence spectra, which can be called a "three-dimensional fluorescence spectrum". Exemplarily, a three-dimensional fluorescence spectrum can also be called a "fluorescence spectrum". Exemplarily, the fluorescent light source 220 can have the ability to emit continuous wavelength light, or it can have the ability to emit discontinuous wavelengths. However, considering the cost, it is best to use a light source with the ability to emit discontinuous wavelengths. As a possible implementation method, such as Figure 3As shown, the fluorescent light source 220 can be mainly composed of an LED array composed of multiple LED units. Each LED unit can include: a metal-oxide-semiconductor field-effect transistor (MOS) switch 221, an LED lamp 222, a filter 223 and an optical fiber 224 connected in sequence. The MOS switch 221 mainly controls the corresponding LED lamp 222 to turn on or off. The filter 223 is mainly used to selectively transmit or absorb light of a specific wavelength, which can be made of but not limited to plastic or glass. The optical fiber 224 is mainly used to transmit the light emitted by the LED lamp 222. In the LED array, multiple optical fibers 224 can be coupled together to output light emitted by different LED units. For Figure 3 The arrangement of the LED array shown can be as follows Figure 4 The rectangular array shown in (A) can also be Figure 4 The circular array shown in (B) can be determined according to actual conditions and is not limited here. For example, the fluorescent light source 220 can also be referred to as the "second light source." Since LED lamps emit light stably and are not easily damaged, using LED lamps as fluorescent light sources can also improve the reliability of the water quality detection system. In addition, using this LED array can also make the fluorescent light source easily expandable, and can conveniently increase the supported range of excitation wavelengths.

[0036] Spectral detector 230 is primarily used to capture / receive the UV-visible absorption spectrum of the transmitted light associated with UV-visible light source 210, as well as to capture / receive the three-dimensional fluorescence spectrum of the emitted light generated by the water sample, in order to measure and analyze the spectral characteristics (e.g., absorption spectrum, emission spectrum, etc.) of the substance components in the water. Exemplarily, spectral detector 230 can capture / receive continuous UV-visible absorption spectra and three-dimensional fluorescence spectra, which can cover the wavelength and intensity range of UV-visible light, excitation fluorescence, and emission fluorescence.

[0037] The data processing device 240 is primarily used to time-share control the UV-visible light source 210 and the fluorescent light source 220 so that they emit light at different times, thereby preventing the two different types of light from interfering with each other. This allows for subsequent acquisition of complementary interference UV-visible absorption spectra and three-dimensional fluorescence spectra. Furthermore, the data processing device 240 can also be used to acquire the UV-visible absorption spectrum and three-dimensional fluorescence spectrum from the spectrum detector 230, as well as to perform fusion calculations on the acquired UV-visible absorption spectrum and three-dimensional fluorescence spectrum to obtain water quality pollution index results. For example, the data processing device 240 can input the UV-visible absorption spectrum and three-dimensional fluorescence spectrum into a neural network model for calculation. In this embodiment, the data processing device 240 can be connected to the UV-visible light source 210, the fluorescent light source 220, and the spectrum detector 230 via wired or wireless connections.

[0038] As a possible implementation, Figure 5 As shown, data processing device 240 may include a controller 241, a power drive circuit 242, and a variable resistor 243. There may be two variable resistors 243, one connected to the UV-visible light source 210, and the other connected to the fluorescent light source 220. Controller 241, which may be a central processing unit (CPU) or a microcontroller unit (MCU), is primarily responsible for data processing and controlling power drive circuit 242 and variable resistor 243 to control the emission duration and intensity of UV-visible light source 210 and fluorescent light source 220.

[0039] The water sample pool 250 is used to hold the water sample to be tested. The water sample pool 250 can be made of, but is not limited to, materials such as quartz glass. The water sample pool 250 can have a water inlet and a water outlet. The water sample to be tested can enter the water sample pool 250 through the water inlet and flow out through the water outlet. As a possible implementation method, water from a water quality monitoring point or observation point can be pumped into the water sample pool 250 by a pump, etc., and the water sample in the water sample pool 250 can be pumped out by a pump. The specific method of adding water samples to the water sample pool 250 and releasing water samples can be determined according to actual conditions and is not limited here.

[0040] In this embodiment, the UV-visible light source 210 and the fluorescent light source 220 can be oriented toward different sides of the water sample pool 250. For example, continue to refer to Figure 2 , the UV-visible light source 210 can be directed toward the bottom of the water sample pool 250, and the fluorescent light source 220 can be directed toward the right side of the water sample pool 250; or Figure 6As shown, the ultraviolet-visible light source 210 can be directed toward the left side of the water sample pool 250, and the fluorescent light source 220 can be directed toward the bottom of the water sample pool 250. Of course, the ultraviolet-visible light source 210 and the fluorescent light source 220 can also be directed toward the same side of the water sample pool 250, for example, both directed toward the bottom of the water sample pool 250. In addition, the light emitted by the ultraviolet-visible light source 210 and the fluorescent light source 220 needs to be irradiated onto the water sample pool 250 so that the light emitted by both can react with the substance components contained in the water sample to be tested in the water sample pool 250. At the same time, the side of the water sample pool 250 illuminated by the ultraviolet-visible light source 210 and the fluorescent light source 220 also needs to be transparent so that light can enter the interior of the water sample pool 250.

[0041] The spectrum detector 230 also needs to face the water sample pool 250 so as to be able to capture the UV-visible absorption spectrum and the three-dimensional fluorescence spectrum. As a possible implementation method, considering that the UV-visible absorption spectrum is determined based on the absorbance of the light emitted by the UV-visible light source 210, and the spectrum detector 230 needs to capture the light emitted by the UV-visible light source 210 and passing through the water sample in the water sample pool 250, it can be as follows Figure 2 As shown, the spectral detector 230 and the UV-visible light source 210 are arranged on the same straight line, that is, they are located on opposite sides of the water sample pool 250. For example, the spectral detector 230 is located on the upper side of the water sample pool 250, and the UV-visible light source 210 is located on the lower side of the water sample pool 250. Alternatively, the spectral detector 230 is located on the right side of the water sample pool 250, and the UV-visible light source 210 is located on the left side of the water sample pool 250, and so on. At the same time, the incident light path of the fluorescent light source 220 can be set to be orthogonal to the incident light path of the UV-visible light source 210. In this way, water quality detection can be achieved at a low cost using two different light sources.

[0042] In addition, when the spectrum detector 230 and the ultraviolet-visible light source 210 are not arranged on the same straight line, for example, Figure 6 As shown, the spectrum detector 230 is located on the upper side of the water sample pool 250, and the ultraviolet-visible light source 210 is located on the left side of the water sample pool 250. At this time, since the ultraviolet-visible spectrum obtained by the spectrum detector 230 captures the transmitted light emitted by the ultraviolet-visible light source 210 and transmitted through the water sample, and the spectrum detector 230 and the ultraviolet-visible light source 210 are not in the same straight line, the transmitted light cannot enter the spectrum detector 230 along the incident direction. Therefore, considering this situation, the water sample pool 250 can be used as a reference and is located on the opposite side of the ultraviolet-visible light source 210 (for example Figure 6A reflective component 310 is provided on the right side of the water sample pool 250 so that the transmitted light can be reflected by the reflective component 310 to the spectrum detector 230. Exemplarily, the reflective component 310 can be a beam splitter (BS).

[0043] Continue reading Figure 2 The light emitted by the UV-visible light source 210 and the fluorescent light source 220 is divergent. If it is not focused, it will cause light waste. Figure 7 As shown, lens units 260 and 270 can also be added to the water quality detection system. Among them, the lens units 260 and 270 can both include one or more collimating lenses. The lens unit 260 can be set on the incident light path of the ultraviolet-visible light source 210, so that the light emitted by the ultraviolet-visible light source 210 can be converted into parallel light (i.e., the light is collimated) by the lens unit 260, so that these lights can be irradiated on the water sample pool 250 in large quantities, avoiding light waste. The lens unit 270 can be set on the excitation light path of the fluorescent light source 220, so that the excitation light emitted by the fluorescent light source 220 can be converted into parallel light by the lens unit 270, so that these lights can be irradiated on the water sample pool 250 in large quantities, avoiding light waste. Exemplarily, the lens unit 260 can be referred to as the "first lens unit" and the lens unit 270 can be referred to as the "second lens unit".

[0044] Continue reading Figure 2 , only a portion of the light passing through the water sample pool 250 and the light generated by the water sample therein is captured by the spectrum detector 230, which results in only a portion of the water sample being analyzed, rather than all of the water sample, resulting in poor detection results. Figure 7 As shown, a lens unit 280 can be added between the spectral detector 230 and the water sample reservoir 250. The lens unit 280 may include one or more focusing lenses. Thus, the light passing through the water sample reservoir 250 (i.e., the outgoing light) and the light generated by the water sample therein are focused by the lens unit 280 and enter the spectral detector 230, allowing the spectral detector 230 to analyze the entire water sample. For example, the lens unit 280 may be referred to as the "third lens unit."

[0045] Similarly, when the water quality detection system is Figure 6 As shown in FIG, a lens unit consisting of a collimating lens and / or a lens unit consisting of a focusing lens can be added therein. A water quality detection system with a lens unit consisting of a collimating lens and a lens unit consisting of a focusing lens can be as follows: Figure 8 As shown. Figure 8The lens unit 320 shown in FIG. 3 may be the same as the lens unit 280 . In addition, the lens unit 320 and the lens unit 280 may be arranged independently or integrated together.

[0046] It should be understood that the lens units 260, 270, 280, and 320 described above can be configured in one configuration (i.e., only one), two configurations (i.e., any two configurations), three configurations (i.e., any three configurations), or even all four simultaneously, depending on actual circumstances and not limited herein. Furthermore, the number of these lens units can also be determined based on actual circumstances and not limited herein.

[0047] The above is an introduction to the water quality detection system provided by this embodiment. When using the above-mentioned water quality detection system to perform water quality detection, the light intensity and emission time slice of the ultraviolet-visible light source 210 and the fluorescent light source 220 can be controlled by the data processing device 240. The ultraviolet-visible light and excitation light emitted at different time slices respectively illuminate the water sample pool 250. The ultraviolet-visible light passing through the water sample pool 250 and the fluorescence generated by the excited light of the water sample can be detected by the spectrum detector 230 at different time slices via the same receiving light path as the ultraviolet-visible absorption spectrum and the three-dimensional fluorescence spectrum. In this way, the ultraviolet-visible absorption spectrum and the three-dimensional fluorescence spectrum that do not interfere with each other can be obtained. Finally, the two types of spectral data are fused and calculated by the data processing device 240 to invert the water quality pollution index.

[0048] The following is an introduction to the debugging phase and monitoring phase of the water quality detection system described above.

[0049] (1) Debugging phase

[0050] See also Figure 9 , the debugging process is as follows:

[0051] a) Empty the water sample from the water sample pool 250. If there is no water sample in the water sample pool 250, this step can be omitted.

[0052] b) Turn on the UV-visible light source 210.

[0053] c) Data processing device 240 obtains the UV-visible absorption spectrum collected by spectral detector 230 from spectral detector 230. Since there is no water sample in water sample pool 250, the light detected by spectral detector 230 at this time is only the light emitted by UV-visible light source 210. Therefore, the light intensity detected by spectral detector 230 at this time can be referred to as "incident light intensity."

[0054] d) The data processing device 240 adjusts the luminous intensity of the UV-visible light source 210 so that the maximum incident light intensity is less than the maximum range of the spectrum detector 230. This allows the spectrum detector 230 to collect light of all intensities emitted by the UV-visible light source 210.

[0055] e) Turn off the UV-visible light source 210.

[0056] f) Fill the water sample pool 250 with the water sample. Of course, it can also be not filled, as long as the test requirements are met.

[0057] g) Turn on the UV-visible light source 210.

[0058] h) Data processing device 240 obtains the UV-visible absorption spectrum collected by spectral detector 230 from spectral detector 230. Because water sample reservoir 250 contains a water sample, the light emitted by UV-visible light source 210 is partially absorbed by the substances in the water sample and transmitted outside the water sample. Therefore, the light detected by spectral detector 230 at this time is the light transmitted from the water sample, and the light intensity detected by spectral detector 230 at this time can be referred to as "transmitted light intensity."

[0059] i) The data processing device 240 adjusts the luminous intensity of the UV-visible light source 210 so that the maximum transmitted light intensity is less than the maximum range of the spectrum detector 230. This allows the spectrum detector 230 to collect light of all intensities emitted by the UV-visible light source 210.

[0060] j) Turn off the UV-visible light source 210.

[0061] k) Empty the water sample in the water sample pool 250.

[0062] 1) Turn on the fluorescent light source 220.

[0063] m) Data processing device 240 obtains the three-dimensional fluorescence spectrum collected by spectral detector 230 from spectral detector 230. Since there is no water sample in water sample pool 250, the light detected by spectral detector 230 at this time is only the light excited by fluorescent light source 220. Therefore, the light intensity detected by spectral detector 230 at this time can be referred to as "excitation light intensity."

[0064] n) The data processing device 240 adjusts the luminous intensity of the fluorescent light source 220 so that the maximum excitation light intensity is less than the maximum range of the spectrum detector 230. This allows the spectrum detector 230 to collect light of all intensities emitted by the fluorescent light source 220.

[0065] o) Turn off the fluorescent light source 220.

[0066] p) Fill the water sample pool 250 with water sample. Of course, it can also be not filled, as long as the test requirements are met.

[0067] q) Turn on the fluorescent light source 220.

[0068] r) Data processing device 240 obtains the three-dimensional fluorescence spectrum collected by spectral detector 230 from spectral detector 230. Because water sample reservoir 250 contains a water sample, the excitation light emitted by fluorescent light source 220 reacts with the components in the water sample, causing them to emit light. Therefore, the light detected by spectral detector 230 is the emitted light generated by the components in the water sample, and the light intensity detected by spectral detector 230 at this time can be referred to as "emission light intensity."

[0069] s) The luminous intensity of the fluorescent light source 220 is adjusted by the data processing device 240 so that the maximum value of the emitted light intensity is less than the maximum range of the spectrum detector 230. In this way, the spectrum detector 230 can collect the emitted light of most of the material components in the water sample.

[0070] t) Turn off the fluorescent light source 220.

[0071] It should be understood that the order in which the UV-visible light source 210 and the fluorescent light source 220 are adjusted can be determined based on the specific circumstances and is not limited herein. The primary purpose of these adjustments is to ensure that the maximum incident and transmitted light intensities associated with the UV-visible light source 210 are both within the detection range of the spectral detector 230, and that the maximum excitation and emission light intensities associated with the fluorescent light source 220 are also within the detection range of the spectral detector 230.

[0072] After debugging is completed, you can enter the "monitoring phase".

[0073] (2) Monitoring phase

[0074] Continue reading Figure 9 The monitoring phase may include at least one monitoring cycle, and the process of each monitoring cycle may remain consistent. Of course, certain monitoring steps may be adjusted based on one's own needs without affecting the monitoring. For example, different monitoring cycles may be separated by a preset time. The specific process of each monitoring cycle is as follows:

[0075] a) Empty the water sample from the water sample pool 250. If there is no water sample in the water sample pool 250, this step can be omitted.

[0076] b) Turn on the UV-visible light source 210.

[0077] c) The data processing device 240 obtains the ultraviolet-visible absorption spectrum (hereinafter referred to as “ultraviolet-visible spectrum 11 ”) collected by the spectrum detector 230 from the spectrum detector 230 .

[0078] d) Turn off the UV-visible light source 210.

[0079] e) Turn on the fluorescent light source 220.

[0080] f) The data processing device 240 obtains the three-dimensional fluorescence spectrum (hereinafter referred to as “three-dimensional fluorescence spectrum 21 ”) collected by the spectrum detector 230 from the spectrum detector 230 .

[0081] g) Turn off the fluorescent light source 220.

[0082] h) Fill the water sample pool 250 with water samples. Of course, it can also be not full, as long as the monitoring requirements are met.

[0083] i) Turn on the UV-visible light source 210.

[0084] j) The data processing device 240 obtains the ultraviolet-visible absorption spectrum (hereinafter referred to as “ultraviolet-visible spectrum 12 ”) collected by the spectrum detector 230 from the spectrum detector 230 .

[0085] k) Turn off the UV-visible light source 210.

[0086] 1) Turn on the fluorescent light source 220.

[0087] m) The data processing device 240 obtains the three-dimensional fluorescence spectrum (hereinafter referred to as “three-dimensional fluorescence spectrum 22 ”) collected by the spectrum detector 230 from the spectrum detector 230 .

[0088] n) Turn off the fluorescent light source 220.

[0089] o) The data processing device 240 inverts water quality indicators based on the UV-visible spectrum 11, the UV-visible spectrum 12, the three-dimensional fluorescence spectrum 21 and the three-dimensional fluorescence spectrum 22, including but not limited to the concentration values ​​of material components such as COD, TP, TN, chlorophyll, blue algae and green algae.

[0090] It can be seen from the above monitoring stages that in each monitoring stage, it is necessary to control the first light source and the second light source to illuminate the water sample pool at different time slices when there is no water sample to be tested in the water sample pool, and to obtain the first ultraviolet-visible spectrum related to the first light source and the first fluorescence spectrum related to the second light source through spectral detection. Then, when there is a water sample to be tested in the water sample pool, the first light source and the second light source are controlled to illuminate the water sample pool at different time slices, and to obtain the second ultraviolet-visible spectrum related to the first light source and the second fluorescence spectrum related to the second light source through spectral detection. Finally, based on the first ultraviolet-visible spectrum, the second ultraviolet-visible spectrum, the first fluorescence spectrum and the second fluorescence spectrum, the water quality index of the water sample to be tested is determined.

[0091] It should be understood that in each monitoring cycle, the order of obtaining the UV-visible spectrum and fluorescence spectrum when there is no water sample in the water sample pool, and obtaining the UV-visible spectrum and fluorescence spectrum when there is a water sample in the water sample pool, can be determined according to the actual situation and is not limited here. For example, the water sample can be added to the water sample pool 250 first, and the UV-visible spectrum and fluorescence spectrum can be obtained; then, the water sample in the water sample pool 250 can be emptied and the UV-visible spectrum and fluorescence spectrum can be obtained. In addition, since the spectrum collected when there is no water sample and the spectrum collected when there is a water sample are required to calculate the water quality index in each monitoring cycle, if the spectrum collected when there is no water sample is not collected in the current monitoring cycle, and the spectrum collected when there is no water sample in other monitoring cycles is used, the equipment parameters used in the same monitoring cycle may be inconsistent, which in turn leads to errors in the detection results. Taking this into account, it is best to collect spectra when there is no water sample and when there is a water sample in each monitoring cycle.

[0092] It should be understood that during the commissioning and monitoring phases of the water quality testing system, when there is no water sample in the water sample pool, it is possible to choose not to illuminate the water sample pool with the second light source, that is, to choose not to collect the aforementioned first fluorescence spectrum. In this case, the water quality indicators of the water sample can be subsequently determined based on the first UV-visible spectrum, the second UV-visible spectrum, and the second fluorescence spectrum.

[0093] It will be understood that the various numerical numbers involved in the embodiments of the present application are merely distinctions for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A water quality detection system, characterized in that: include: A first light source is used to irradiate the water sample to be tested with light having a wavelength range covering the ultraviolet and visible light regions; a second light source, for exciting the water sample to be tested to generate emitted light; the second light source comprises an LED array, the LED array comprises a plurality of LED units, wherein the wavelengths of light emitted by different LED units are different and discontinuous; a spectral detector for receiving the fluorescence spectrum of the emitted light and the ultraviolet-visible spectrum of the transmitted light associated with the first light source; The data processing device is used to control the first light source and the second light source to emit light in different time slices, and determine the water quality index of the water sample to be tested based on the fluorescence spectrum and the ultraviolet-visible spectrum collected in time sharing.

2. The water quality detection system according to claim 1, characterized in that: The water quality detection system also includes a water sample pool; The water sample pool is used to hold the water sample to be tested, wherein the water sample to be tested contains multiple material components, and different material components react differently to light of different wavelengths.

3. The water quality detection system according to claim 2, characterized in that: The spectral detector is located on a first side of the water sample pool, the first light source is located on a second side of the water sample pool, and the second light source is located on a third side of the water sample pool, wherein the first side and the second side are opposite sides.

4. The water quality detection system according to claim 3, characterized in that: Also includes: The first lens unit includes at least one collimating lens and is arranged between the first light source and the water sample pool.

5. The water quality detection system according to claim 4, characterized in that: Also includes: The second lens unit includes at least one collimating lens and is arranged between the second light source and the water sample pool.

6. The water quality detection system according to claim 5, characterized in that: Also includes: The third lens unit includes at least one focusing lens and is arranged between the spectrum detector and the water sample pool.

7. The water quality detection system according to any one of claims 1 to 6, characterized in that: Each of the LED units includes a switch, an LED lamp, a filter, and an optical fiber connected in sequence, wherein the optical fibers in different LED units are coupled together.

8. The water quality detection system according to claim 1, characterized in that: The LED array is circular or rectangular.

9. The water quality detection system according to claim 1, characterized in that: The wavelength of the light irradiated by the first light source is a continuous wavelength.

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