Method for detecting concentration of organic matters in water body and organic matter concentration detection device

Abstract

The invention discloses a method for detecting the concentration of organic matters in a water body and an organic matter concentration detection device, and relates to the technical field of automatic control, and the method comprises the following steps: collecting a to-be-detected water body generated in the washing process of a dish-washing machine through a water body sampling cabin, and emitting incident ultraviolet light to the to-be-detected water body through an ultraviolet light emitting module; receiving the emergent ultraviolet light penetrating through the to-be-detected water body through an ultraviolet light receiving module, and determining the emergent light intensity corresponding to the emergent ultraviolet light; the method comprises the following steps: determining the first spectral integral intensity of incident ultraviolet light according to the incident light intensity of incident ultraviolet light through a concentration detection module, determining the second spectral integral intensity of emergent ultraviolet light according to the emergent light intensity, and determining the organic matter concentration of a water body to be detected according to the first spectral integral intensity and the second spectral integral intensity. The method can directly measure the concentration of organic matters in the water body, makes up for the defect that a turbidity sensor cannot measure the concentration of organic matters in the water body, and improves the accuracy and comprehensiveness of a water quality detection result.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology, and in particular to a method and device for detecting the concentration of organic matter in water. Background Technology

[0002] In today's world, where artificial intelligence and the Internet of Things are reshaping the home ecosystem, dishwashers have evolved from simple cleaning tools into the intelligent hub of the modern kitchen. Especially in fast-paced urban life, they have become a key element in balancing work efficiency and quality of life. During the dishwasher wash cycle, water is the core washing medium, and differences in water quality directly affect washing efficiency, equipment lifespan, and cleaning safety.

[0003] Currently, dishwashers typically rely on turbidity sensors for water quality testing, which determines cleanliness by measuring changes in the transmitted or scattered light in the water. However, this method cannot detect organic matter in the water, resulting in insufficient accuracy and comprehensiveness of the water quality test results. Summary of the Invention

[0004] This invention provides a method and device for detecting the concentration of organic matter in water, in order to solve the problem that existing turbidity sensors cannot detect organic matter in water, resulting in insufficient accuracy and comprehensiveness of water quality test results.

[0005] According to one aspect of the present invention, a method for detecting the concentration of organic matter in water is provided, applied to an organic matter concentration detection device, the organic matter concentration detection device being disposed in a dishwasher, the organic matter concentration detection device including an ultraviolet light emitting module, a water sampling chamber, an ultraviolet light receiving module, and a concentration detection module; the water sampling chamber is located between the ultraviolet light emitting module and the ultraviolet light receiving module, and is located on the light emission path of the ultraviolet light emitting module; the ultraviolet light emitting module and the ultraviolet light receiving module are arranged opposite to each other, the method comprising:

[0006] The water sampler collects the washing water generated by the dishwasher during the washing process through the water sampling chamber, which is used as the water to be tested. The ultraviolet light is emitted into the water to be tested through the ultraviolet light emission module as the incident ultraviolet light.

[0007] The ultraviolet light receiving module receives ultraviolet light passing through the water body to be tested, which is then used as emitted ultraviolet light, and the intensity of the emitted ultraviolet light is determined.

[0008] The concentration detection module determines the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and determines the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity, and determines the organic matter concentration of the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

[0009] According to another aspect of the present invention, an organic matter concentration detection device is provided, configured in a dishwasher. The organic matter concentration detection device includes an ultraviolet light emitting module, a water sampling chamber, an ultraviolet light receiving module, and a concentration detection module. The water sampling chamber is located between the ultraviolet light emitting module and the ultraviolet light receiving module, and is situated on the light emission path of the ultraviolet light emitting module. The ultraviolet light emitting module and the ultraviolet light receiving module are arranged opposite to each other.

[0010] The water sampling chamber is used to collect the washing water generated by the dishwasher during the washing process, as the water to be tested;

[0011] The ultraviolet light emitting module is used to emit ultraviolet light into the water body to be detected as incident ultraviolet light;

[0012] The ultraviolet light receiving module is used to receive ultraviolet light passing through the water body to be tested as emitted ultraviolet light, and to determine the emitted light intensity corresponding to the emitted ultraviolet light.

[0013] The concentration detection module is used to determine the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and to determine the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity, and to determine the organic matter concentration of the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

[0014] This invention emits ultraviolet light into the water body to be tested via an ultraviolet light emitting module as incident ultraviolet light, and receives the ultraviolet light passing through the water body as emitted ultraviolet light via an ultraviolet light receiving module. Then, a concentration detection module determines the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and determines the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity. Finally, the organic matter concentration of the water body to be tested is determined based on the first spectral integral intensity and the second spectral integral intensity. The beneficial effects are as follows:

[0015] Since organic matter in water absorbs ultraviolet light, by calculating the first spectral integral intensity of the incident ultraviolet light and the second spectral integral intensity of the emitted ultraviolet light, and analyzing the difference between the first and second spectral integral intensities, the concentration of organic matter in the water can be directly measured. This overcomes the limitation of using turbidity sensors to measure the concentration of organic matter in water, and improves the accuracy and comprehensiveness of water quality detection results.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0018] Figure 1 A flowchart illustrating a method for detecting the concentration of organic matter in water provided in Embodiment 1 of the present invention;

[0019] Figure 2 A flowchart illustrating a method for detecting the concentration of organic matter in water, provided in Embodiment 2 of the present invention;

[0020] Figure 3A This is a schematic diagram of the structure of an organic matter concentration detection device provided in Embodiment 3 of the present invention;

[0021] Figure 3B This is a schematic diagram of another organic matter concentration detection device provided in Embodiment 3 of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] Example 1

[0025] Figure 1 This is a flowchart of a method for detecting the concentration of organic matter in water according to Embodiment 1 of the present invention. This embodiment is applicable to situations where ultraviolet light is used to detect the concentration of organic matter in the washing water generated during the washing process of a dishwasher. The method can be applied to an organic matter concentration detection device configured in the dishwasher. The organic matter concentration detection device includes an ultraviolet light emitting module, a water sampling chamber, an ultraviolet light receiving module, and a concentration detection module. The water sampling chamber is located between the ultraviolet light emitting module and the ultraviolet light receiving module, and is situated on the light emission path of the ultraviolet light emitting module. The ultraviolet light emitting module and the ultraviolet light receiving module are arranged opposite each other. Figure 1 As shown, the method includes:

[0026] S101. The washing water generated by the dishwasher during the washing process is collected through the water sampling chamber and used as the water body to be tested. Ultraviolet light is emitted to the water body to be tested through the ultraviolet light emission module as the incident ultraviolet light.

[0027] The water sampling chamber is a specially designed sampling container or cavity used to collect and temporarily hold washing water samples from a dishwasher for subsequent testing. It is located between the ultraviolet (UV) emitting module and the UV receiving module in the organic matter concentration detection device, ensuring that UV light can directly penetrate the water sample. Its material is typically transparent or translucent to minimize UV ​​absorption or scattering, thereby guaranteeing detection accuracy.

[0028] A dishwasher is a household or commercial automated appliance used to clean dishes. It achieves water circulation, cleaning, and drying through components such as a spray system, heating elements, and detergent. The wash water produced during the washing process refers to the water that the dishwasher recycles during operation. It contains dissolved or suspended contaminants, such as food scraps, grease, proteins, and detergent residues. Over time, organic matter accumulates in the wash water, and changes in its concentration directly reflect the washing effect.

[0029] The water sample to be tested refers to a specific water sample collected during the dishwasher's washing process. This sample is placed in a dedicated water sampling chamber and serves as the direct target for detecting organic matter concentration. The ultraviolet (UV) light emission module is a core component of the detection device, responsible for generating and emitting UV light of a specific wavelength to illuminate the water sample. This module typically includes a light source and optical lenses to ensure beam stability. Incident UV light refers to the initial light signal of the raw UV beam emitted from the UV light emission module before it enters the water sample.

[0030] In one implementation, during the dishwasher's washing process, when the dishwasher's detection system determines, according to a preset program, that it is necessary to monitor the concentration of organic matter, such as at the end of the main wash or the beginning of the rinse stage, the dishwasher's control system will activate an automatic sampling mechanism:

[0031] First, a small sample of wash water is drawn from the dishwasher's circulating water circuit using a miniature solenoid valve or water pump. This sample is then introduced into the water sampling chamber through a flexible pipe. Second, during sampling, the inlet valve of the water sampling chamber is opened to allow water flow, while the outlet valve remains closed. This ensures the water sample completely fills the chamber and forms a closed environment, preventing air bubbles or external contamination, thus obtaining a representative sample of the water to be tested. Finally, after sampling is complete, the inlet valve is closed, and the water is isolated within the water sampling chamber, ready for subsequent ultraviolet light transmission analysis.

[0032] Furthermore, after detecting that the water sampling chamber has completed sampling, the dishwasher's control system activates the ultraviolet light emitting module and emits a beam of ultraviolet light through the ultraviolet light emitting module at the incident window of the water sampling chamber as the incident ultraviolet light, and ensures that the light path passes perpendicularly through the water sampling chamber to maximize the accuracy of light absorption measurement.

[0033] S102. Receive ultraviolet light passing through the water body to be tested through the ultraviolet light receiving module, use it as emitted ultraviolet light, and determine the emitted light intensity corresponding to the emitted ultraviolet light.

[0034] The ultraviolet (UV) light receiving module is a key component in the organic matter concentration detection device, specifically responsible for receiving and detecting UV light signals transmitted from the water body. It is essentially an optical sensor system, typically containing a photodetector (such as a photodiode or photomultiplier tube) that converts the received UV light into a measurable electrical signal. In organic matter concentration detection, this module's role is to capture the light signal passing through the water body being tested, providing raw data for subsequent intensity analysis.

[0035] Emitted ultraviolet light refers to the ultraviolet light beam that passes through the water body being tested and reaches the ultraviolet light receiving module. It originates from the incident ultraviolet light emitted by the ultraviolet light emitting module. After passing through the water body being tested, its spectral characteristics change due to the absorption and scattering effects of organic matter in the water.

[0036] The emitted light intensity refers to the light energy of emitted ultraviolet light, usually expressed as luminous flux per unit area or in relative units. It is measured by the ultraviolet light receiving module, quantifying the residual intensity of the ultraviolet light after passing through the water body being tested. In the concentration detection module, the emitted light intensity is compared with the incident light intensity to deduce the organic matter concentration.

[0037] In one implementation, after the incident ultraviolet light penetrates the water sampler chamber, the attenuated emitted ultraviolet light first reaches the optical window of the ultraviolet light receiving module. This module is equipped with a high-precision ultraviolet photodetector, whose photosensitive surface faces the emitted light path of the water sampler chamber to ensure maximum capture of the transmitted light signal. The ultraviolet photodetector converts the received emitted ultraviolet photons into a current signal. This current signal is then converted into a voltage signal by a built-in transimpedance amplifier, and further quantized in real time by an analog-to-digital converter. Finally, within a preset integration time, the digital signals from multiple samples are subjected to a moving average filter to output a stable digital voltage value as a representation of the emitted light intensity.

[0038] S103. The concentration detection module determines the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and determines the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity, and determines the organic matter concentration of the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

[0039] The concentration detection module is the core computing unit of the organic matter concentration detection device, responsible for converting light intensity signals into organic matter concentration values. It processes the electrical signals transmitted from the ultraviolet light receiving module to ultimately output a quantitative organic matter concentration.

[0040] The first spectral integral intensity refers to the total energy integral value of the incident ultraviolet light within a specific wavelength range, representing the original light energy before absorption by the water body being tested. The second spectral integral intensity refers to the total energy integral value of the incident ultraviolet light within the same wavelength range, reflecting the remaining light energy after absorption by the water body being tested.

[0041] The concentration of organic matter in the water to be tested refers to the total mass percentage of dissolved or suspended organic pollutants in the water to be tested, and is a direct indicator for determining whether the dishwasher's rinsing process meets the standards.

[0042] In one implementation, the concentration detection module first reads the incident light intensity recorded by the built-in reference sensor of the ultraviolet light emitting module, and combines it with a pre-stored light source-wavelength response curve to perform numerical integration within a preset wavelength band, generating a first spectral integrated intensity characterizing the total incident energy. Then, it acquires the emitted light intensity transmitted by the ultraviolet light receiving module, performs numerical integration within the same preset wavelength band, and generates a second spectral integrated intensity characterizing the total emitted energy. Further, the target optical density of residual organic matter contained in the water body to be detected is determined based on the first and second spectral integrated intensities.

[0043] Furthermore, in one embodiment, the target optical density is mapped to the final organic concentration of the water body to be detected by using a pre-calibrated "organic concentration-optical density" conversion model.

[0044] In another implementation, the equivalent relationship between "optical density" and "equivalent absorption cross-sectional area of ​​residual organic matter", "optical path length of water sampling chamber" and "organic matter concentration" is determined, and then the "optical path length of water sampling chamber" is obtained and the "equivalent absorption cross-sectional area of ​​residual organic matter" is calculated. Based on the equivalent relationship, the organic matter concentration of the water to be tested is calculated according to the target optical density, the equivalent absorption cross-sectional area of ​​residual organic matter and the optical path length of water sampling chamber.

[0045] In this embodiment of the invention, ultraviolet light is emitted into the water body to be tested by an ultraviolet light emitting module as incident ultraviolet light, and ultraviolet light passing through the water body to be tested is received by an ultraviolet light receiving module as emitted ultraviolet light. Then, a concentration detection module determines the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and determines the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity. The organic matter concentration of the water body to be tested is determined based on the first spectral integral intensity and the second spectral integral intensity. The beneficial effects are as follows:

[0046] Firstly, since organic matter in water absorbs ultraviolet light, by calculating the first spectral integral intensity of the incident ultraviolet light and the second spectral integral intensity of the emitted ultraviolet light, and analyzing the difference between the first and second spectral integral intensities, the concentration of organic matter in the water can be directly measured. This makes up for the inability of turbidity sensors to measure the concentration of organic matter in water, and improves the accuracy and comprehensiveness of water quality detection results.

[0047] Secondly, the organic matter concentration detection device can be integrated into the dishwasher's water circuit to achieve continuous monitoring of the entire process from pre-wash to final rinsing, with strong real-time data and rich sensing capabilities.

[0048] Thirdly, the final output is a digital and easy-to-understand "organic matter concentration", which makes the interface for communication with the dishwasher's main control system simple and universal, facilitating the intelligent control of the dishwasher.

[0049] Fourthly, the components of the organic matter concentration detection device are miniaturized, which has the advantages of small size, less material, and controllable cost, making it very suitable for large-scale application in home appliances.

[0050] Example 2

[0051] Figure 2 This is a flowchart of a method for detecting the concentration of organic matter in water according to Embodiment 2 of the present invention. This embodiment further optimizes and expands the above embodiments and can be combined with the various optional implementation methods described above. Figure 2 As shown, the method includes:

[0052] S201. The washing water generated by the dishwasher during the washing process is collected through the water sampling chamber and used as the water body to be tested. Ultraviolet light is emitted to the water body to be tested through the ultraviolet light emission module as the incident ultraviolet light.

[0053] S202. Receive ultraviolet light passing through the water body to be tested through the ultraviolet light receiving module, use it as emitted ultraviolet light, and determine the emitted light intensity corresponding to the emitted ultraviolet light.

[0054] S203. Determine the lower wavelength limit and the upper wavelength limit based on the wavelength range of the incident ultraviolet light, and determine the specific incident light intensity corresponding to the incident ultraviolet light at at least one wavelength, and determine the specific outgoing light intensity corresponding to the outgoing ultraviolet light at at least one wavelength.

[0055] The wavelength range of incident ultraviolet light refers to the effective spectral range output by the ultraviolet light emitting module, that is, the continuous ultraviolet band that the light source can stably radiate and that can be recognized by the ultraviolet light receiving module. The lower wavelength limit refers to the starting wavelength of the wavelength range, and the upper wavelength limit refers to the ending wavelength of the wavelength range. For example, a lower wavelength limit of 200 nm and an upper wavelength limit of 1100 nm can be selected.

[0056] A specific incident light intensity represents the raw ultraviolet light energy measured at a single target wavelength, before absorption by the water body being tested. A specific emitted light intensity represents the residual ultraviolet light energy measured at the same target wavelength after penetrating the water body being tested.

[0057] In one implementation, a pre-calibrated wavelength range of incident ultraviolet light is obtained, and a specific number of target wavelengths are selected within this range. Then, the intensity of the incident light under pure water reference conditions is measured using a high-precision spectrometer as the specific incident light intensity. During actual testing, the water body to be tested flows through the water sampling chamber, and the ultraviolet light receiving module synchronously captures the emitted ultraviolet light of the same specific wavelength. After lock-in amplification and AD conversion, the specific emitted light intensity of the corresponding wavelength is output.

[0058] S204. Using the lower limit of wavelength as the lower limit of integration and the upper limit of wavelength as the upper limit of integration, perform integration calculation on the intensity of each specific incident light to determine the first spectral integral intensity. Using the lower limit of wavelength as the lower limit of integration and the upper limit of wavelength as the upper limit of integration, perform integration calculation on the intensity of each specific outgoing light to determine the second spectral integral intensity.

[0059] The lower limit of integration is the starting wavelength position in the spectral integration calculation, representing the spectral starting point of the integration operation. The upper limit of integration is the ending wavelength position in the spectral integration calculation, representing the spectral ending point of the integration operation.

[0060] Integrating the intensity of each specific incident light refers to continuously summing the incident light intensities measured at discrete wavelengths within the integration interval to generate a first spectral integral intensity characterizing the total incident energy. Integrating the intensity of each specific emitted light refers to continuously summing the emitted light intensities measured at discrete wavelengths within the same integration interval to generate a second spectral integral intensity characterizing the remaining energy after transmission.

[0061] In one implementation, the first spectral integral intensity is determined using the following formula:

[0062] ;

[0063] in, Indicates the integrated intensity of the first spectrum. This represents the lower limit of integration. This indicates the maximum score. This indicates that the incident ultraviolet light has a wavelength of The specific incident light intensity corresponding to the time.

[0064] The integrated intensity of the second spectrum is determined using the following formula:

[0065] ;

[0066] in, Indicates the integrated intensity of the second spectrum. This represents the lower limit of integration. This indicates the maximum score. This indicates that the emitted ultraviolet light has a wavelength of The specific emitted light intensity corresponding to the time.

[0067] By determining the lower and upper wavelength limits based on the wavelength range of the incident ultraviolet light, and by determining the specific incident light intensities corresponding to at least one wavelength of the incident ultraviolet light; using the lower wavelength limit as the lower limit of integration and the upper wavelength limit as the upper limit of integration, the first spectral integral intensity is determined by integrating the specific incident light intensities; and by determining the specific emitted ultraviolet light intensities corresponding to at least one wavelength of the emitted ultraviolet light, using the lower wavelength limit as the lower limit of integration and the upper wavelength limit as the upper limit of integration, the second spectral integral intensity is determined by integrating the specific emitted light intensities. The beneficial effects are:

[0068] Because relying on single-wavelength ultraviolet light for organic matter concentration detection is susceptible to fluctuations in the light source and scattering by bubbles in the water, the accuracy of the final detection results is insufficient. This method integrates the specific incident light intensity and specific outgoing light intensity at discrete wavelength points within the wavelength range, and obtains the first and second spectral integral intensities through statistical averaging effects. This reduces the interference of random errors on the final results and improves the accuracy of the final detection results.

[0069] S205. Determine the target optical density of residual organic matter contained in the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

[0070] Residual organic matter refers to organic pollutants or compounds remaining in the water body being tested, mainly including incompletely degraded organic matter such as humus, dissolved organic carbon, pesticide residues, and industrial chemicals. These substances usually originate from natural processes or anthropogenic pollution. Target optical density specifically refers to the absorbance value calculated at a specific wavelength for residual organic matter, reflecting the degree to which ultraviolet light is absorbed when passing through the water body being tested.

[0071] In one implementation, the target optical density is determined using the following formula:

[0072] ;

[0073] in, Indicates the target optical density, Indicates the integrated intensity of the first spectrum. This represents the integrated intensity of the second spectrum.

[0074] S206. Determine the equivalent absorption cross-sectional area of ​​the residual organic matter, and determine the concentration of organic matter in the water to be tested based on the target optical density, the equivalent absorption cross-sectional area, and the optical path length of the water sampling chamber.

[0075] The equivalent absorption cross-sectional area represents the effective area for light absorption by residual organic matter, describing the probability that residual organic matter absorbs ultraviolet light at a specific wavelength. The optical path length of the water sampling chamber represents the physical path distance of ultraviolet light through the water body being tested, indicating the straight-line distance traveled by ultraviolet light from incident to exit within the water sampling chamber.

[0076] By determining the target optical density of residual organic matter in the water body to be tested based on the integrated intensity of the first and second spectra, and by determining the equivalent absorption cross-sectional area of ​​the residual organic matter, and then determining the concentration of organic matter in the water body to be tested based on the target optical density, the equivalent absorption cross-sectional area, and the optical path length of the water sampling chamber, the beneficial effects are:

[0077] Firstly, traditional chemical methods require a long time to estimate the concentration of organic matter, while this method directly determines the concentration of organic matter through spectral analysis, thus shortening the time required to determine the concentration of organic matter.

[0078] Secondly, by calculating the equivalent absorption cross-sectional area, the light absorption characteristics of multiple organic compounds can be integrated into a unified equivalent parameter, which can reduce the error in the final calculation of organic compound concentration.

[0079] Optionally, the equivalent absorption cross-sectional area of ​​the residual organic matter is determined, including:

[0080] A1. Determine the specific absorption cross-sectional area of ​​the residual organic matter at at least one wavelength, and determine the specific incident light intensity of the incident ultraviolet light at at least one wavelength.

[0081] Among them, the specific absorption cross-sectional area refers to the effective absorption cross-sectional area of ​​a unit organic molecule for ultraviolet light at a single wavelength, which characterizes the light absorption capacity of the molecule at that wavelength.

[0082] B1. Based on the ratio between the intensity of each specific incident light and the intensity of the first spectral integral, determine the spectral weighting coefficients corresponding to each specific absorption cross-sectional area, and determine the weighted absorption cross-sectional area based on each specific absorption cross-sectional area and each spectral weighting coefficient.

[0083] Among them, the spectral weighting coefficients represent the energy ratio of the specific incident light intensity at each wavelength to the first spectral integral intensity, reflecting the spectral energy distribution characteristics of the light source. The weighted absorption cross-sectional area represents the linear superposition of specific absorption cross-sectional areas according to the spectral weighting coefficients.

[0084] In one implementation, the weighted absorption cross-sectional area is determined using the following formula:

[0085] ;

[0086] in, Indicates the integrated intensity of the first spectrum. This indicates that the incident ultraviolet light has a wavelength of The specific incident light intensity corresponding to the time, This indicates that the wavelength of the residual organic matter in the incident ultraviolet light is... The specific absorption cross-sectional area corresponding to the time, This represents the weighted absorption cross-sectional area.

[0087] C1. Obtain the preset wavelength lower limit and preset wavelength upper limit, and use the preset wavelength lower limit as the integration lower limit and the preset wavelength upper limit as the integration upper limit. Perform integration calculation on each weighted absorption cross-sectional area to determine the equivalent absorption cross-sectional area.

[0088] The integral calculation of each weighted absorption cross-sectional area means that the weighted absorption cross-sectional area is continuously summed within the integration interval formed by the preset lower wavelength limit and the preset upper wavelength limit to generate the equivalent absorption cross-sectional area.

[0089] In one implementation, the equivalent absorption cross-sectional area is determined using the following formula:

[0090] ;

[0091] in, The preset lower limit value for wavelength, The preset wavelength upper limit, This represents the weighted absorption cross-sectional area.

[0092] By determining the specific absorption cross-sectional area corresponding to residual organic matter at at least one wavelength, and the specific incident light intensity corresponding to incident ultraviolet light at at least one wavelength; determining the spectral weighting coefficients corresponding to each specific absorption cross-sectional area based on the ratio between each specific incident light intensity and the first spectral integral intensity, and determining the weighted absorption cross-sectional area based on each specific absorption cross-sectional area and each spectral weighting coefficient; obtaining a preset wavelength lower limit and a preset wavelength upper limit, and using the preset wavelength lower limit as the integration lower limit and the preset wavelength upper limit as the integration upper limit, integrating each weighted absorption cross-sectional area to determine the equivalent absorption cross-sectional area, the beneficial effects are:

[0093] Traditional single-wavelength measurements neglect the differences in absorption cross-sections of different organic compounds at specific wavelengths, leading to significant errors in organic compound concentration detection results in mixed pollution scenarios. This proposed solution, however, utilizes dynamic allocation of spectral weighting coefficients to ensure that high-energy wavelengths dominate detection.

[0094] Furthermore, by continuously integrating and fusing the absorption cross-sections, the absorption characteristics across the entire wavelength range can be integrated, thereby further reducing the error in the detection results of organic matter concentration.

[0095] Optionally, the concentration of organic matter in the water to be tested is determined based on the target optical density, equivalent absorption cross-sectional area, and optical path length of the water sampling chamber, including:

[0096] The concentration of organic matter in the water body to be tested is determined using the following formula:

[0097] ;

[0098] in, This indicates the concentration of organic matter in the water body being tested. Indicates the target optical density, Represents the equivalent absorption cross-sectional area. Indicates the optical path length.

[0099] The derivation process of the above formula is as follows:

[0100] First, determine the specific wavelength. At a specific incident light intensity and specific emitted light intensity The equivalence relation between them:

[0101] ;

[0102] in, The attenuation factor is determined by the specific absorption cross-sectional area. Optical path length and the concentration of organic matter in the water body to be tested .

[0103] Next, according to and The equivalence relationship between them determines the specific wavelength. Optical density of residual organic matter :

[0104] ;

[0105] Finally, the target optical density Linearization is performed to obtain the target optical density of residual organic matter. :

[0106] ;

[0107] After conversion, the formula for determining the organic matter concentration of the water body to be tested is obtained:

[0108] .

[0109] Optionally, after determining the organic matter concentration of the water body to be detected based on the first spectral integrated intensity and the second spectral integrated intensity, the method further includes:

[0110] Determine the water temperature and pressure of the water body to be tested; based on the Boltzmann constant, water temperature, water pressure, and organic matter concentration, determine the volume mixing ratio of the water body to be tested.

[0111] The volume mixing ratio refers to the ratio of the volume of organic components to the total volume of water under the same temperature and pressure.

[0112] In one implementation, the volume mixing ratio is determined using the following formula:

[0113] ;

[0114] in, Indicates the volume mixing ratio. This indicates the water pressure of the water body being tested. This indicates the water temperature of the water body being tested. Represents the Boltzmann constant. Indicates the concentration of organic matter.

[0115] By determining the water temperature and pressure of the water body to be tested, and based on the Boltzmann constant, water temperature, water pressure, and organic matter concentration, the volume mixing ratio of the water body to be tested is determined. The beneficial effects are:

[0116] Firstly, the detection of organic matter concentration ignores the influence of water temperature and water pressure on the distribution of dissolved molecules, resulting in large errors in deep and shallow water scenarios. This solution, by introducing water pressure, water temperature and Boltzmann constant to calculate the volume mixing ratio, can reduce the error impact of different scenarios on the detection results and improve the accuracy of the detection results.

[0117] Secondly, the numerical representation of organic matter concentration is usually small and has poor readability, such as "0.0000001ug / L". By converting it into a dimensionless standardized index of volume mixing ratio, the readability of the numerical representation can be improved.

[0118] Optionally, the method also includes:

[0119] 1) Collect clean water extracted by the dishwasher during the water intake process through the water sampling chamber as a reference water body, and emit ultraviolet light into the reference water body through the ultraviolet light emission module as auxiliary incident ultraviolet light.

[0120] The reference water body refers to the purified water collected from the dishwasher's inlet through the water sampling chamber, serving as the background reference for optical detection. The auxiliary incident ultraviolet light refers to the beam of light directly illuminating the reference water body through the ultraviolet light emitting module.

[0121] In one implementation, after the dishwasher has finished filling with water, when the dishwasher's detection system determines, according to a preset program, that the incident light intensity needs to be measured, the dishwasher's control system activates an automatic sampling mechanism. A small sample of clean water is drawn from the dishwasher's inlet via a miniature solenoid valve or water pump. This sample is then introduced into the water sampling chamber through a flexible pipe as a reference water body. Furthermore, after detecting that the water sampling chamber has completed sampling, the dishwasher's control system activates the ultraviolet light emitting module and emits a beam of ultraviolet light through the module, aimed at the incident window of the water sampling chamber, as auxiliary incident ultraviolet light.

[0122] 2) The ultraviolet light passing through the reference water body is received by the ultraviolet light receiving module as auxiliary emitted ultraviolet light, and the intensity of the auxiliary emitted ultraviolet light is determined as the incident intensity of the incident ultraviolet light.

[0123] Among them, the auxiliary emitted ultraviolet light represents the physical quantity that quantifies the energy of the auxiliary emitted ultraviolet light, which is directly used as the incident light intensity of the incident ultraviolet light in the subsequent organic matter concentration detection process.

[0124] The water sampling chamber collects clean water extracted by the dishwasher during the water intake process, which serves as the reference water. Ultraviolet light is emitted into the reference water via an ultraviolet light emitting module as auxiliary incident ultraviolet light. The ultraviolet light receiving module receives the ultraviolet light passing through the reference water as auxiliary emitted ultraviolet light, and the intensity of the auxiliary emitted ultraviolet light is determined as the incident intensity of the incident ultraviolet light. The beneficial effect is that it effectively eliminates the drift problem of incident light intensity caused by light source aging of the ultraviolet light emitting module or window contamination of the water sampling chamber, thereby further ensuring the accuracy of organic matter concentration detection results.

[0125] Optionally, the organic matter concentration detection device may also include a cabin cleaning module, and the method may also include:

[0126] The chamber cleaning module detects dirt in the water sampling chamber based on the light intensity threshold and the incident light intensity. If the chamber cleaning module determines that the water sampling chamber is dirty, it cleans the chamber.

[0127] The chamber cleaning module is a self-maintenance subsystem integrated into the organic matter concentration detection device, enabling pollution control of the optical window of the water sampling chamber. The light intensity threshold is the critical transmittance index for determining the pollution of the optical window of the water sampling chamber.

[0128] In one embodiment, the incident light intensity is compared with a pre-set light intensity threshold by a chamber cleaning module. If the incident light intensity is greater than the light intensity threshold, it means that the optical window of the water sampling chamber is relatively clean and no chamber cleaning is required. If the incident light intensity is less than or equal to the light intensity threshold, it means that the optical window of the water sampling chamber is dirty. Then, the integrated mechanical scraping structure is used to clean the water sampling chamber to remove attached water troughs and oil films.

[0129] The chamber cleaning module detects dirt in the water sampling chamber based on light intensity thresholds and incident light intensity. When the cleaning module determines that the water sampling chamber is dirty, it cleans the chamber. The advantages are: traditional solutions cannot detect optical window contamination, leading to misinterpretations of decreased emitted light intensity as increased organic matter concentration. This solution, through dynamic diagnosis using light intensity thresholds, automatically cleans the chamber when dirt is detected in the optical window, ensuring the cleanliness of the optical window and further improving the accuracy of organic matter concentration detection results.

[0130] Optionally, the organic matter concentration detection device may also include a fault monitoring module, and the method may also include:

[0131] The fault monitoring module monitors the working status of the ultraviolet light emitting module and the ultraviolet light receiving module respectively; when the fault monitoring module determines that the ultraviolet light emitting module or the ultraviolet light receiving module has failed, the fault monitoring module generates fault alarm information.

[0132] The fault monitoring module is integrated into the real-time diagnostic center of the organic matter concentration detection device, providing full lifecycle health management. A fault in the ultraviolet (UV) emission or reception module refers to a deviation of key parameters from safety thresholds, resulting in detection failure or excessive error. Fault alarm information refers to the structured diagnostic report generated by the fault monitoring module.

[0133] In one implementation, the working status of the ultraviolet light emitting module and the ultraviolet light receiving module is monitored in real time by a fault monitoring module. If it is determined that the ultraviolet light emitting module has a fault, such as light source aging, or the ultraviolet light receiving module has a fault, such as detector not responding, a fault alarm message is generated and sent to the dishwasher main control system or user terminal.

[0134] The fault monitoring module monitors the working status of the ultraviolet light emitting module and the ultraviolet light receiving module respectively. When the fault monitoring module determines that the ultraviolet light emitting module or the ultraviolet light receiving module has a fault, it generates a fault alarm message. The beneficial effect is that it can detect and alarm the fault status of the ultraviolet light emitting module or the ultraviolet light receiving module in a timely manner, which helps to ensure the success rate of organic matter concentration detection.

[0135] Example 3

[0136] Figure 3A This is a schematic diagram of an organic matter concentration detection device provided in Embodiment 3 of the present invention. It is applicable to situations where ultraviolet light is used to detect the organic matter concentration in the wash water generated during the washing process of a dishwasher. Figure 3A As shown, the device is configured in a dishwasher and includes an ultraviolet light emitting module 30, a water sampling chamber 31, an ultraviolet light receiving module 32, and a concentration detection module 33. The water sampling chamber 31 is located between the ultraviolet light emitting module 30 and the ultraviolet light receiving module 32, and is situated on the light emission path of the ultraviolet light emitting module 30. The ultraviolet light emitting module 30 and the ultraviolet light receiving module 32 are arranged opposite to each other.

[0137] The water sampling chamber 31 is used to collect the washing water generated by the dishwasher during the washing process as the water to be tested.

[0138] The water sampling chamber 31 may include a flow cell that can be directly connected in series or in parallel to be integrated into the dishwasher's circulating water circuit. This flow cell is composed of high-temperature and corrosion-resistant quartz glass windows and channels, providing a detection window for ultraviolet light.

[0139] The ultraviolet light emitting module 30 is used to emit ultraviolet light into the water body to be tested as incident ultraviolet light.

[0140] The ultraviolet light emitting module 30 is composed of a UV-LED light source with a specific wavelength, which has the advantages of small size, low power consumption and long life.

[0141] The ultraviolet light receiving module 32 is used to receive ultraviolet light passing through the water body to be tested, as emitted ultraviolet light, and to determine the emitted light intensity corresponding to the emitted ultraviolet light.

[0142] The ultraviolet light receiving module 32 uses a photodiode or spectral chip that is sensitive to ultraviolet light and is arranged opposite to the ultraviolet light emitting module 30 to accurately measure the light intensity signal after penetrating the water sample.

[0143] The concentration detection module 33 is used to determine the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and to determine the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity, and to determine the organic matter concentration of the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

[0144] Optionally, the concentration detection module 33 is specifically used for:

[0145] The lower wavelength limit and the upper wavelength limit are determined based on the wavelength range of the incident ultraviolet light, and the specific incident light intensity corresponding to the incident ultraviolet light at at least one wavelength is determined.

[0146] The lower wavelength limit is used as the lower limit of integration, and the upper wavelength limit is used as the upper limit of integration. The intensity of each specific incident light is integrated to determine the first spectral integrated intensity.

[0147] The specific emitted light intensity corresponding to each of the emitted ultraviolet light at at least one wavelength is determined, and the lower limit of the wavelength is used as the lower limit of integration, and the upper limit of the wavelength is used as the upper limit of integration. The specific emitted light intensity is integrated to determine the second spectral integrated intensity.

[0148] Optionally, the concentration detection module 33 is further used for:

[0149] The target optical density of residual organic matter contained in the water body to be detected is determined based on the first spectral integrated intensity and the second spectral integrated intensity.

[0150] The equivalent absorption cross-sectional area of ​​the residual organic matter is determined, and the concentration of organic matter in the water to be tested is determined based on the target optical density, the equivalent absorption cross-sectional area, and the optical path length of the water sampling chamber.

[0151] Optionally, the concentration detection module 33 is further used for:

[0152] Determine the specific absorption cross-sectional area of ​​the residual organic matter at at least one wavelength, and determine the specific incident light intensity of the incident ultraviolet light at at least one wavelength;

[0153] Based on the ratio between each specific incident light intensity and the first spectral integral intensity, the spectral weighting coefficients corresponding to each specific absorption cross-sectional area are determined, and the weighted absorption cross-sectional area is determined based on each specific absorption cross-sectional area and each spectral weighting coefficient.

[0154] Obtain a preset lower wavelength limit and a preset upper wavelength limit, and use the preset lower wavelength limit as the integration lower limit and the preset upper wavelength limit as the integration upper limit to perform integration calculation on each of the weighted absorption cross-sectional areas to determine the equivalent absorption cross-sectional area.

[0155] Optionally, the concentration detection module 33 is further used for:

[0156] The organic matter concentration of the water body to be tested is determined using the following formula:

[0157] ;

[0158] Among them, the This indicates the concentration of organic matter in the water body to be tested. The target optical density is represented by the Represents the equivalent absorption cross-sectional area, the This indicates the optical path length.

[0159] Optionally, the concentration detection module 33 is further used for:

[0160] Determine the water temperature of the water body to be tested, and determine the water pressure of the water body to be tested;

[0161] The volume mixing ratio of the water to be tested is determined based on the Boltzmann constant, the water temperature, the water pressure, and the organic matter concentration.

[0162] Optionally, the water sampling chamber 31 is also used to collect clean water drawn by the dishwasher during the water intake process as a reference water body;

[0163] The ultraviolet light emitting module 30 is also used to emit ultraviolet light into the reference water body as auxiliary incident ultraviolet light;

[0164] The ultraviolet light receiving module 32 is also used to receive ultraviolet light passing through the reference water body as auxiliary emitted ultraviolet light, and to determine the intensity of the auxiliary emitted ultraviolet light as the intensity of the incident ultraviolet light.

[0165] Figure 3B This is a schematic diagram of another organic matter concentration detection device provided in Embodiment 3 of the present invention. Optionally, based on the above structure, the organic matter concentration detection device further includes a chamber cleaning module 34, specifically used for:

[0166] The water sampling chamber is tested for dirt and grime based on the light intensity threshold and the incident light intensity.

[0167] If it is determined that the water sampling chamber is dirty, the chamber shall be cleaned.

[0168] Optionally, the organic matter concentration detection device further includes a fault monitoring module 35, specifically used for:

[0169] Monitor the operating status of the ultraviolet light emitting module and the ultraviolet light receiving module respectively;

[0170] When a fault is detected in the ultraviolet light emitting module or the ultraviolet light receiving module, a fault alarm message is generated.

[0171] The organic matter concentration detection device provided in the embodiments of the present invention can execute the organic matter concentration detection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method.

[0172] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting the concentration of organic matter in water, characterized in that, An organic matter concentration detection device is used in a dishwasher. The organic matter concentration detection device includes an ultraviolet light emitting module, a water sampling chamber, an ultraviolet light receiving module, and a concentration detection module. The water sampling chamber is located between the ultraviolet light emitting module and the ultraviolet light receiving module, and is located on the light emission path of the ultraviolet light emitting module. The ultraviolet light emitting module and the ultraviolet light receiving module are arranged opposite to each other, and the method includes: The water sampler collects the washing water generated by the dishwasher during the washing process through the water sampling chamber, which is used as the water to be tested. The ultraviolet light is emitted into the water to be tested through the ultraviolet light emission module as the incident ultraviolet light. The ultraviolet light receiving module receives ultraviolet light passing through the water body to be tested, which is then used as emitted ultraviolet light, and the intensity of the emitted ultraviolet light is determined. The concentration detection module determines the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and determines the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity, and determines the organic matter concentration of the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

2. The method according to claim 1, characterized in that, The step of determining the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity using the concentration detection module includes: The lower wavelength limit and the upper wavelength limit are determined based on the wavelength range of the incident ultraviolet light, and the specific incident light intensity corresponding to the incident ultraviolet light at at least one wavelength is determined. The lower wavelength limit is used as the lower limit of integration, and the upper wavelength limit is used as the upper limit of integration. The intensity of each specific incident light is integrated to determine the first spectral integrated intensity. The step of determining the second spectral integrated intensity of the emitted ultraviolet light based on the emitted light intensity using the concentration detection module includes: The specific emitted light intensity corresponding to each of the emitted ultraviolet light at at least one wavelength is determined, and the lower limit of the wavelength is used as the lower limit of integration, and the upper limit of the wavelength is used as the upper limit of integration. The specific emitted light intensity is integrated to determine the second spectral integrated intensity.

3. The method according to claim 1, characterized in that, The step of determining the organic matter concentration of the water body to be detected based on the first spectral integrated intensity and the second spectral integrated intensity includes: The target optical density of residual organic matter contained in the water body to be detected is determined based on the first spectral integrated intensity and the second spectral integrated intensity. The equivalent absorption cross-sectional area of ​​the residual organic matter is determined, and the concentration of organic matter in the water to be tested is determined based on the target optical density, the equivalent absorption cross-sectional area, and the optical path length of the water sampling chamber.

4. The method according to claim 3, characterized in that, Determining the equivalent absorption cross-sectional area of ​​the residual organic matter includes: Determine the specific absorption cross-sectional area of ​​the residual organic matter at at least one wavelength, and determine the specific incident light intensity of the incident ultraviolet light at at least one wavelength; Based on the ratio between each specific incident light intensity and the first spectral integral intensity, the spectral weighting coefficients corresponding to each specific absorption cross-sectional area are determined, and the weighted absorption cross-sectional area is determined based on each specific absorption cross-sectional area and each spectral weighting coefficient. Obtain a preset lower wavelength limit and a preset upper wavelength limit, and use the preset lower wavelength limit as the integration lower limit and the preset upper wavelength limit as the integration upper limit to perform integration calculation on each of the weighted absorption cross-sectional areas to determine the equivalent absorption cross-sectional area.

5. The method according to claim 3, characterized in that, The step of determining the organic matter concentration of the water body to be tested based on the target optical density, the equivalent absorption cross-sectional area, and the optical path length of the water sampling chamber includes: The organic matter concentration of the water body to be tested is determined using the following formula: ； Among them, the This indicates the concentration of organic matter in the water body to be tested. The target optical density is represented by the Represents the equivalent absorption cross-sectional area, the This indicates the optical path length.

6. The method according to claim 1, further comprising, after determining the organic matter concentration of the water body to be detected based on the first spectral integrated intensity and the second spectral integrated intensity: Determine the water temperature of the water body to be tested, and determine the water pressure of the water body to be tested; The volume mixing ratio of the water to be tested is determined based on the Boltzmann constant, the water temperature, the water pressure, and the organic matter concentration.

7. The method according to claim 1, characterized in that, The method further includes: The water sampling chamber collects clean water extracted by the dishwasher during the water intake process as a reference water body, and the ultraviolet light emission module emits ultraviolet light into the reference water body as auxiliary incident ultraviolet light. The ultraviolet light receiving module receives ultraviolet light passing through the reference water body as auxiliary emitted ultraviolet light, and determines the intensity of the auxiliary emitted ultraviolet light as the incident intensity of the incident ultraviolet light.

8. The method according to claim 1, characterized in that, The organic matter concentration detection device also includes a chamber cleaning module, and the method further includes: The cleaning module detects dirt in the water sampling chamber based on the light intensity threshold and the incident light intensity. If the chamber cleaning module determines that the water sampling chamber is dirty, the chamber cleaning module will clean the water sampling chamber.

9. The method according to claim 1, characterized in that, The organic matter concentration detection device further includes a fault monitoring module, and the method further includes: The fault monitoring module monitors the operating status of the ultraviolet light emitting module and the ultraviolet light receiving module respectively. When the fault monitoring module determines that the ultraviolet light emitting module or the ultraviolet light receiving module has malfunctioned, it generates a fault alarm message.

10. An organic matter concentration detection device, characterized in that, The organic matter concentration detection device, configured in a dishwasher, includes an ultraviolet (UV) light emitting module, a water sampling chamber, an UV light receiving module, and a concentration detection module. The water sampling chamber is located between the UV emitting module and the UV receiving module, and is situated along the light emission path of the UV emitting module. The UV emitting module and the UV receiving module are arranged opposite to each other. The water sampling chamber is used to collect the washing water generated by the dishwasher during the washing process, as the water to be tested; The ultraviolet light emitting module is used to emit ultraviolet light into the water body to be detected as incident ultraviolet light; The ultraviolet light receiving module is used to receive ultraviolet light passing through the water body to be tested as emitted ultraviolet light, and to determine the emitted light intensity corresponding to the emitted ultraviolet light. The concentration detection module is used to determine the first spectral integral intensity of the incident ultraviolet light based on the incident light intensity, and to determine the second spectral integral intensity of the emitted ultraviolet light based on the emitted light intensity, and to determine the organic matter concentration of the water body to be detected based on the first spectral integral intensity and the second spectral integral intensity.

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