Water quality sensing device

Abstract

This water quality sensing device comprises: a flow path pipe; an external light blocking unit formed such that the flow path pipe is inserted therein, and configured such that an inlet and an outlet of the flow path pipe are exposed through a first side surface and a second side surface; a first light source coupled to a first point of the flow path pipe and configured to emit first light to the inner region of the flow path pipe; a second light source coupled to a second point of the flow path pipe and configured to emit second light to the inner region of the flow path pipe; and a detector configured to detect scattered light of the first light scattered in the inner region of the flow path pipe and detect reflected light of the second light reflected from a surface of the flow path pipe.

Description

Water quality sensing device

[0001] The present invention relates to a water quality sensing device. More specifically, it relates to a water quality sensing device and method capable of measuring the turbidity of water used in home appliances.

[0002] Generally, household appliances that use water, such as water purifiers, dishwashers, and washing machines, are equipped with various sensors to monitor water turbidity because they must use clean water.

[0003] Turbidity refers to the concentration of light-scattering or light-absorbing particles suspended in a fluid. When turbidity increases within a fluid, light transmittance may vary depending on the distribution of suspended particles, refractive index, surface characteristics, and other factors.

[0004] By adjusting the cleaning or water purification cycles of home appliances based on water turbidity information, waste of water, electricity, detergent, etc., can be minimized. Furthermore, based on water turbidity information, drinking water purified under optimal conditions can be provided, or items such as tableware and clothing washed under optimal conditions can be provided.

[0005] However, existing turbidity sensors have limitations in measuring water pollution in low-turbidity ranges, making it difficult to ensure the safety of drinking water, such as in household appliances. Therefore, there is a need to develop a water quality measuring device equipped with sensing capabilities that can detect water quality in low-turbidity ranges as well as high-turbidity ranges.

[0006] Meanwhile, an impurity detection system utilizing chaotic waves can be provided for water quality measurement. In this regard, if the depth of the irregularity is small relative to the wavelength of the incident light, the number of multiple scattering events due to reflection decreases. Conversely, if the depth of the irregularity is large relative to the wavelength of the incident light, multiple scattering due to diffuse reflection increases. Therefore, by irradiating the fluid with the multiple scattered light, interference in the optical path caused by the movement of internal constituent materials and changes in the pattern over time can be measured. Accordingly, it is possible to determine the presence and estimate the concentration of impurities within the fluid.

[0007] However, if a uniform pattern or an irregular uneven structure is constructed to detect low turbidity in low-turbidity regions, the reliance on multiple reflections of light increases the likelihood of obstruction of water flow and accumulation of foreign substances in the uneven areas. In this regard, it is possible to analyze the fluctuation patterns of impurity coherence with respect to laser light over the time axis. Consequently, while it is possible to estimate the concentration of impurities / foreign substances and turbidity within the fluid, time delays occur, making real-time measurement impossible.

[0008] The purpose of this specification is to provide a water quality measuring device having a sensing function capable of detecting low turbidity water quality.

[0009] The purpose of this specification is to enable real-time turbidity measurement by preventing time delays when estimating turbidity caused by foreign substances in a fluid.

[0010] The purpose of this specification is to provide a water quality measuring device capable of effectively detecting foreign substances having scattering and reflection components.

[0011] The purpose of this specification is to effectively determine abnormal water quality conditions and pollution conditions in relation to the determination of water turbidity.

[0012] The purpose of this specification is to overcome the issue of false detection caused by water quality conditions, such as biofilms and activated carbon, in existing sensors in low turbidity regions applicable to drinking water appliances.

[0013] The purpose of this specification is to provide a home appliance, such as a water purification device, capable of detecting low turbidity water quality and measuring turbidity in real time.

[0014] A water quality sensing device according to the specification comprises: a flow channel; an external light blocking part formed to surround the flow channel and configured such that the inlet and outlet of the flow channel are exposed through a first side and a second side, wherein the external light blocking part is formed such that the flow channel is inserted into the interior of the external light blocking part; a first light source coupled to a first point of the flow channel and configured to emit a first light into an interior region of the flow channel; a second light source coupled to a second point of the flow channel and configured to emit a second light into an interior region of the flow channel; and a detector configured to detect scattered light of the first light scattered in an interior region of the flow channel and to detect reflected light of the second light reflected from a surface of the flow channel. The water quality sensing device may further comprise a processor operably coupled to the first light source, the second light source, and the detector, and configured to measure turbidity inside the flow channel and detect whether the flow channel is contaminated based on the detected scattered light of the first light and reflected light of the second light.

[0015] According to an embodiment, the first point to which the first light source is coupled and the point to which the detector is coupled may be spaced apart at an angle of 90 degrees. The second point to which the second light source is coupled and the point to which the detector is coupled may be spaced apart at an angle of 0 degrees.

[0016] According to an embodiment, the water quality sensing device may further include a reflector formed between a third point and a fourth point on the inner or outer side of the flow channel. The third point of the flow channel is a point facing the first point of the flow channel, and the fourth point of the flow channel is a point facing the second point of the flow channel. The reflector may be formed in a first fan shape of 90 degrees or less along the curved surface of the flow channel between the third point and the fourth point of the flow channel.

[0017] According to an embodiment, the water quality sensing device may further include a reflector formed in both directions based on a fourth point on the inner or outer side of the flow channel. The fourth point of the flow channel is a point opposite to the second point of the flow channel. The reflector may be formed in a second fan shape of 90 degrees or less along the curved surface of the flow channel based on the fourth point of the flow channel.

[0018] According to an embodiment, the water quality sensing device may further include a reflector formed in a third fan shape greater than 90 degrees and less than 120 degrees along the curved surface of the flow channel between a third point on the inner or outer side of the flow channel and the first point. The reflector may be formed in an asymmetrical structure in both directions with respect to a fourth point on the inner or outer side of the flow channel. A first end of the reflector may be formed adjacent to the third point, and a second end of the reflector may be formed spaced apart from the first point at an angle of 45 degrees or more.

[0019] According to an embodiment, the water quality sensing device may further include a switch configured to control a first light emission state of the first light source and a second light emission state of the second light source. The processor may control the switch to turn on the first light source so that the first light is emitted into the inner region, and may measure a first turbidity value by detecting scattered light of the first light. The processor may control the switch to turn on the second light source so that the second light is emitted into the inner region, and may measure a second turbidity value by detecting reflected light of the second light. Based on the first turbidity value and the second turbidity value, the processor may calculate a turbidity value of the inner region.

[0020] According to an embodiment, the processor can control the second light source to an off state during a first time interval in which the first light source is in an on state. The processor can measure the first turbidity value during a second time interval following the first time interval. The processor can control the first light source to an off state during a third time interval in which the second light source is in an on state. The processor can measure the second turbidity value during a fourth time interval following the third time interval.

[0021] According to an embodiment, the water quality sensing device may further include a digital-to-analog converter disposed between the processor and the switch, receiving a serial data signal and a serial clock signal from the processor, and transmitting a control signal to control the first light source and the second light source through the switch. The water quality sensing device may further include an operational amplifier connected to the detector and configured to amplify signals associated with the detected scattered light and reflected light. The water quality sensing device may further include a low-pass filter configured to filter low-frequency signal components of the amplified signals and transmit the filtered signal components to the processor.

[0022] According to an embodiment, the water quality sensing device may further include a thermistor coupled to the processor and configured to measure the temperature of the internal region of the flow channel. The processor may determine whether the first turbidity value or the second turbidity value exceeds a threshold value. If the first turbidity value or the second turbidity value exceeds the threshold value, the processor may determine whether the flow channel is contaminated by condensation. If it is determined that the flow channel is contaminated by condensation, the processor may control a temperature controller to control the temperature of the internal region of the flow channel.

[0023] According to an embodiment, if the first turbidity value and the second turbidity value are smaller than the threshold value, the processor can determine whether the first turbidity value and the second turbidity value are in a steady state in which a linear relationship of a first-order function is established, or in an abnormal state that deviates from the linear relationship. If the first turbidity value and the second turbidity value are in a steady state, the processor can calculate the turbidity value of the internal region based on the first turbidity value and the second turbidity value.

[0024] According to an embodiment, if the first turbidity value and the second turbidity value are in an abnormal state, the processor can determine whether the internal region is contaminated by foreign substances or biofilms. If the processor determines that the internal region is contaminated by foreign substances or biofilms, it can control the flow path of the flow path pipe to be cleaned. The processor can control water to be introduced into the internal region of the flow path pipe while the flow path of the flow path pipe is cleaned.

[0025] According to an embodiment, the threshold value of the first turbidity value or the second turbidity value may be set to 4000. The normal state may be defined as a first region in which the first turbidity value and the second turbidity value establish a linear relationship of the first function. The abnormal state may be defined as a second region in which the first turbidity value is greater than the first region, or a third region in which the second turbidity value is greater than the first region. The contaminated state may be defined as a fourth region in which the first turbidity value and the second turbidity value are greater than the abnormal state of the third region.

[0026] According to an embodiment, when the temperature of the internal region is controlled, the processor can control the switch to turn on the first light source so that the first light is emitted into the internal region. The processor can measure a first turbidity value by detecting scattered light of the first light. The processor can control the switch to turn on the second light source so that the second light is emitted into the internal region. The processor can measure a second turbidity value by detecting reflected light of the second light. If the measured first turbidity value or the second turbidity value is in a normal state, the processor can calculate the turbidity value of the internal region based on the first turbidity value and the second turbidity value.

[0027] According to an embodiment, if the first turbidity value and the second turbidity value are smaller than the threshold value, the processor can determine whether the internal region is contaminated by foreign substances or biofilms. If it is determined that there is contamination by foreign substances or biofilms in the internal region, the processor can control the flow path of the flow path pipe to be cleaned. The processor can control water to be introduced into the internal region of the flow path pipe while the flow path of the flow path pipe is cleaned.

[0028] According to an embodiment, the processor can control the switch to turn on the first light source so that the first light is emitted into the internal region while water is introduced into the internal region. The processor can measure a first turbidity value by detecting scattered light of the first light. The processor can control the switch to turn on the second light source so that the second light is emitted into the internal region. The processor can measure a second turbidity value by detecting reflected light of the second light. If the measured first turbidity value or second turbidity value is in a normal state, the processor can calculate the turbidity value of the internal region based on the first turbidity value and the second turbidity value.

[0029] A water quality sensing method according to another aspect of the present specification may be performed by a processor of a water quality sensor device. The method comprises: a first light source driving process for controlling a switch to turn on a first light source coupled to a first point of the flow channel so that a first light is emitted into an internal region of the flow channel; a first turbidity value measuring process for measuring a first turbidity value by detecting scattered light of the first light scattered in the internal region through a detector; a second light source driving process for controlling the switch to turn on a second light source coupled to a second point of the flow channel so that a second light is emitted into the internal region; a second turbidity value measuring process for measuring a second turbidity value by detecting reflected light of the second light reflected from the surface of the flow channel through the detector; and a turbidity value calculation process for calculating a turbidity value of the internal region based on the first turbidity value and the second turbidity value.

[0030] A water purification device according to another aspect of the present specification comprises: an inlet formed to receive water; a water quality sensing device configured to detect the turbidity of water flowing in through a flow path from the inlet; and a water supply port formed to discharge the water with detected turbidity. The water quality sensing device comprises: an external light blocking part formed to surround the flow path, wherein the inlet and outlet of the flow path are exposed through a first side and a second side—the external light blocking part is formed such that the flow path is inserted into the interior of the external light blocking part; a first light source coupled to a first point of the flow path and configured to emit a first light into an internal region of the flow path; a second light source coupled to a second point of the flow path and configured to emit a second light into an internal region of the flow path; and a detector configured to detect scattered light of the first light scattered in the internal region of the flow path and to detect reflected light of the second light reflected from the surface of the flow path. and includes a processor operably coupled with the first light source, the second light source, and the detector, and configured to measure the turbidity inside the flow channel. The processor detects scattered light of the first light through the detector to measure a first turbidity value, detects reflected light of the second light through the detector to measure a second turbidity value, calculates a turbidity value of the internal region based on the first turbidity value and the second turbidity value, and can detect whether the flow channel is contaminated.

[0031] According to the present specification, it is possible to implement a water quality measuring device having a sensing function capable of detecting low turbidity water quality by utilizing scattered light and reflected light that are scattered and reflected from foreign substances with respect to incident light.

[0032] According to the present specification, real-time turbidity measurement is possible by using scattered light and reflected light scattered and reflected from foreign substances with respect to incident light to prevent time delay phenomena when estimating turbidity caused by foreign substances in a fluid.

[0033] According to the present specification, foreign substances having scattering and reflection components can be effectively detected by optimally placing two light sources and one detector in one side area of ​​the flow channel and optimally placing a reflector in the other side area.

[0034] According to the present specification, abnormal water quality conditions and pollution conditions can be effectively determined through a two-dimensional turbidity pattern by scattered light and reflected light.

[0035] According to the present specification, through machine learning-based two-dimensional turbidity pattern classification, the issue of false detection caused by water quality conditions such as biofilm and activated carbon of existing sensors in low turbidity areas applicable to drinking water appliances can be overcome.

[0036] According to the present specification, it is possible to detect water turbidity in drinking water appliances by preventing false detection caused by Euro contamination and ensuring the safety of drinking water through the detection of water turbidity itself.

[0037] According to the present specification, it is possible to prevent false detection caused by Euro contamination and reduce unnecessary replacement costs by setting a customized filter replacement cycle based on contamination standards through the detection of turbidity of the water quality itself.

[0038] According to the present specification, a low-cost water quality detection device can be manufactured using low-cost light-emitting diodes and photodiodes, and the application to home appliances can be expanded.

[0039] According to the present specification, a home appliance such as a water purification device capable of detecting low turbidity water quality and measuring turbidity in real time can be provided through an optimal structure of two light sources and one detector.

[0040] According to the present specification, it is possible to provide water quality control and customer reassurance services through real-time monitoring and measurement of water quality in home appliances such as water purification devices.

[0041] Further scopes of the applicability of the present invention will become apparent from the following detailed description. However, since various changes and modifications within the spirit and scope of the present invention are clearly understood by those skilled in the art, specific embodiments, such as the detailed description and preferred embodiments of the present invention, should be understood as being given merely as examples.

[0042] FIG. 1 shows a structure in which a flow path of a water quality sensing device according to the present specification is inserted.

[0043] Figure 2 shows a block diagram of the water quality sensing device of Figure 1.

[0044] Figure 3 shows a structure for detecting light that is reflected and scattered by foreign substances when a first light and a second light are incident inside the Euro tube of Figure 2.

[0045] Figure 4 shows the structure of a flow path in a water quality sensing device, in which reflectors according to the embodiments are formed in different regions along the curved surface of the flow path.

[0046] Figure 5 is a graph showing the turbidity performance evaluation for the first scattered light and the second reflected light.

[0047] Figure 6 shows a structure in which a reflector is formed in a fan shape at an angle greater than 90 degrees across the first and second quadrants of the flow channel.

[0048] Figure 7 shows a detailed block diagram of the water quality sensing device of Figure 2.

[0049] Figure 8 shows a conceptual diagram of the light emission control of the first and second light sources and the detection of the first scattered light and the second reflected light in a time division method.

[0050] Figure 9 shows a graph that determines the water quality status through the distinction of two-dimensional turbidity patterns of the first turbidity value and the second turbidity value.

[0051] FIGS. 10 and FIGS. 11 show flowcharts of a water quality sensing method according to other aspects of the present specification.

[0052] FIG. 12 shows the configuration of a water purification device having a water quality sensing device according to another aspect of the present specification.

[0053] The technology disclosed in this specification applies to water purification devices and laundry devices capable of inhibiting scale adhesion. However, the technology disclosed in this specification is not limited thereto and may be applied to all water purification devices and laundry devices capable of inhibiting scale adhesion to which the technical concept of the technology can be applied.

[0054] It should be noted that technical terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Furthermore, unless specifically defined otherwise in this specification, technical terms used in this specification should be interpreted in the sense generally understood by those skilled in the art to which the invention pertains, and should not be interpreted in an overly broad or overly narrow sense. Additionally, if a technical term used in this specification is an incorrect technical term that fails to accurately express the spirit of the invention, it should be understood as being replaced by a technical term that can be correctly understood by those skilled in the art. Moreover, general terms used in this invention should be interpreted according to their prior definitions or the context, and should not be interpreted in an overly narrow sense.

[0055] Additionally, singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may not be included, or that additional components or steps may be included.

[0056] Furthermore, the suffixes "module" and "part" for components used in this specification are assigned or used interchangeably solely for the sake of ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0057] Additionally, terms including ordinal numbers, such as first, second, etc., used herein may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0058] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. Identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0059] Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such descriptions could obscure the essence of the invention. Additionally, it should be noted that the attached drawings are intended only to facilitate an understanding of the concept of the present invention and should not be interpreted as limiting the concept of the present invention.

[0060] Hereinafter, a water purification device capable of inhibiting scale adhesion according to the present specification will be described. In this regard, FIG. 1 shows a structure in which a flow path of a water quality sensing device according to the present specification is inserted. FIG. 2 shows a block diagram of the water quality sensing device of FIG. 1.

[0061] Referring to the water quality sensing device (1000) of FIG. 1, a flow channel (1030) may be formed inside an external light blocking part (1200). A first light source (1310) may be placed at a first point (P1) of the flow channel (1030). A second light source (1320) may be placed at a second point (P2a) of the flow channel (1030). A detector (1330) may be placed at a second point (P2b) of the flow channel (1030). The second point (P2a) of the flow channel (1030) where the second light source (1320) is placed may be a point on the Z-axis higher than the second point (P2b) of the flow channel (1030) where the detector (1330) is placed. In this regard, interference between the first light source (1310) and the second light source (1320) can be reduced not only in the XY plane but also in the Z-axis direction.

[0062] With reference to FIGS. 1 and 2, a water quality sensing device (1000) according to the present specification is described. The water quality sensing device (1000) is configured such that incident light is applied into a flow channel (1020) through a plurality of light sources. The water quality sensing device (1000) can determine the water quality within the flow channel (1020) by detecting light that is reflected and scattered by particles within the flow channel (1020) by the incident light.

[0063] In this regard, the water quality sensing device (1000) may be configured to include a flow path (1020), an external light blocking unit (1200), a first light source (1310), a second light source (1320), a detector (1330), and a processor (1400). The first light source (1310) and the second light source (1320) may be implemented as a first light-emitting diode (LED) and a second light-emitting diode, respectively.

[0064] The external light blocking part (1200) may be formed so that the flow channel (1020) is inserted into the interior of the external light blocking part (1200). A liquid, such as water, may be contained inside the flow channel (1020). The external light blocking part (1200) may be formed to surround the outside of the flow channel (1020). The external light blocking part (1200) is configured to block the inflow of light from the outside, excluding the first light source (1310) and the second light source (1320). The external light blocking part (1200) may be configured so that the inlet and outlet of the flow channel (1020) are exposed through the first side and the second side.

[0065] A first light source (1310) may be coupled to a first point (P1) of the flow channel (1020). The first light source (1310) may be configured to emit a first light into the inner region of the flow channel (1020). A second light source (1320) may be coupled to a second point (P2) of the flow channel (1020). The second light source (1320) may be configured to emit a second light into the inner region of the flow channel (1020). The flow channel (1020) may be formed in a cylindrical shape to accommodate fluid inside. The flow channel (1020) may have a pipe shape with a through hole formed to allow fluid to flow inside, but is not limited thereto and can be modified according to the application. The entire surface of the flow channel (1020) may be formed of a light-transmitting member.

[0066] A reflector (1100) may be placed in a portion of the inner or outer side of the flow channel (1020). The reflector (1100) may increase the light reflection characteristics of low-turbidity particles with low light scattering. The reflector (1100) may be formed of a metal member to reflect light traveling through the flow channel (1020) from the first and second light sources (1310, 1320).

[0067] A water quality sensing device (1000) according to the present specification may be configured to stably detect foreign substances by detecting light that is reflected and scattered as different first light and second light are incident. In this regard, FIG. 3 shows a structure in which the first light and second light are incident inside the flow channel of FIG. 2 and light that is reflected and scattered by foreign substances is detected.

[0068] Referring to FIG. 3, a liquid with turbidity (1021) may be present in the inner region of the flow channel (1020). The flow channel (1020) may be formed of glass or plastic material. The flow channel (1020) may be implemented as a vial formed of glass or plastic material. Foreign matter (1022) may be present in the inner region of the flow channel (1020). The foreign matter (1022) may float in the liquid (1021) or settle on the wall of the flow channel (1020).

[0069] A first light may be incident at an angle of 0 degrees into the inner region of the flow channel (1020) from a first point of the flow channel (1020) through a first light source (1310). The first light may be reflected by a foreign substance (1022) or scattered by the foreign substance (1022), and the first reflected light (first scattered light) may travel in a 180-degree direction. In this regard, if the component scattered by the foreign substance (1022) is greater than the component reflected, the direction of travel of the first scattered light is changed at an angle of approximately -90 degrees relative to the first incident light. Accordingly, the scattering angle (θn) of the first scattered light may be detected at an angle of approximately -90 degrees. The scattering angle of the first scattered light is not limited to this and may be formed differently depending on the type and shape of the foreign substance (1022) and the type of liquid, etc.

[0070] A second light may be incident at an angle of 90 degrees into the inner region of the flow channel (1020) from a second point of the flow channel (1020) through a second light source (1320). The second light may be reflected by a foreign substance (1022) or scattered by the foreign substance (1022), and a second reflected light (second scattered light) may travel in a 180-degree direction. In this regard, if the component reflected by the foreign substance (1022) is greater than the component scattered, the direction of travel of the second reflected light changes at an angle of approximately 180 degrees relative to the first incident light. Accordingly, the reflection angle of the second reflected light can be detected at an angle of approximately -90 degrees.

[0071] A first scattered light traveling in a direction of approximately -90 degrees relative to the first incident light and a second reflected light traveling in a direction of 180 degrees are directed toward a second point of the flow channel (1020). The first scattered light and the second reflected light directed toward the second point of the flow channel (1020) can be detected at the second point of the flow channel (1020) or at a detector (1330) placed adjacent thereto.

[0072] The scattered light detection method of the low turbidity sensor may cause problems with misdetection and stability depending on environmental conditions, depending on the state of various water quality solutions. For example, if a substance such as biofilm settles on the wall of the flow channel (1020), the non-contact light detection sensor may be unable to detect it or may extract an abnormal value. Therefore, to prevent such misdetection, it is necessary to check whether foreign substances have settled.

[0073] The water quality sensing device (1000) according to the present specification determines whether there is an abnormality in the water quality sensing environment by changing the turbidity detection limit of a single-channel method to a two-dimensional array structure of two channels. That is, in the case of a biofilm, the scattered light of the first light source (1310) and the reflected light of the second light source (1320) are checked simultaneously. Therefore, the turbidity of the liquid can be calculated based on the difference between the scattered light value and the reflected light value of ordinary purified water free of foreign substances, thereby allowing for the identification of abnormal values.

[0074] With reference to FIGS. 1 to 3, the detection process of the water quality sensing device (1000) according to the present specification will be described in detail. A detector (1330) may be configured to detect scattered light of a first light scattered in an internal region of a flow path (1020). Additionally, the detector (1330) may be configured to detect reflected light of a second light reflected from the surface of the flow path (1020). A processor (1400) may be operably coupled with a first light source (1310), a second light source (1320), and a detector (1330). The processor (1400) may be configured to measure the turbidity inside the flow path (1020). The processor (1400) may be configured to measure the turbidity inside the flow channel (1020) based on the scattered light of the first light and the reflected light of the second light, and to detect whether the flow channel (1020) is contaminated.

[0075] The first point to which the first light source (1310) is coupled and the point to which the detector (1330) is coupled may be spaced apart at an angle of 90 degrees. The second point to which the second light source (1320) is coupled and the point to which the detector (1330) is coupled may be spaced at an angle of 0 degrees. The processor (1400) may be placed on a substrate coupled to the side of the external light blocking part (1200).

[0076] A first light source (1310) emits light to detect turbidity caused by foreign substances inside the flow channel (1020), and scattered light scattered by foreign substances can be detected by a detector (1330). A second light source (1320) emits light to detect contamination of the surface of the flow channel (1020), and reflected light reflected by contaminants on the surface can be detected by a detector (1330).

[0077] Meanwhile, a reflector (1100) may be disposed in the flow channel (1020) of the water quality sensing device (1000). In this regard, FIG. 4 shows the structure of a flow channel in which a reflector according to embodiments is formed in different regions along the curved surface of the flow channel in the water quality sensing device. Referring to FIG. 4(a) and FIG. 4(b), the reflector (1100) is shown disposed inside the flow channel (1020), but is not limited thereto and may be disposed outside the flow channel (1020) as in FIG. 2.

[0078] Referring to FIGS. 2 to 4(a), a reflector (1100) may be placed in the area of ​​the first quadrant of the XY plane on the inner or outer side of the flow channel (1020). The reflector (1100) may be formed on the inner or outer side of the flow channel (1020). The reflector (1100) may be formed between the third point (P3) and the fourth point (P4) of the flow channel (1020). The reflector (1100) may be placed on the inner or outer side of the flow channel (1020) between the third point (P3) and the fourth point (P4) of the flow channel (1020). As the reflector (1100) is placed in the area of ​​the first quadrant, light scattered in the direction of the first quadrant may also be reflected and detected through the detector (1330). Therefore, scattered light scattered in the downward direction by foreign matter (1022) and scattered light scattered in the first quadrant in the upward direction can both be detected through the detector (1330).

[0079] The third point (P3) of the flow channel (1020) may be a point facing the first point (P1) of the flow channel (1020). The third point (P3) of the flow channel (1020) may be a point facing the first point (P1) of the flow channel (1020) at an angle of 180 degrees. The fourth point (P4) of the flow channel (1020) may be a point facing the second point (P2) of the flow channel (1020). The fourth point (P4) of the flow channel (1020) may be a point facing the second point (P2) of the flow channel (1020) at an angle of 180 degrees. The reflector (1100) may be formed in a fan shape of 90 degrees or less along the curved surface of the flow channel (1020) between the third point (P3) and the fourth point (P4) of the flow channel (1020).

[0080] Referring to FIGS. 2, FIGS. 3 and FIGS. 4(b), a reflector (1100b) may be positioned across a portion of the first quadrant and a portion of the second quadrant of the XY plane on the inner or outer side of the flow channel (1020). The reflector (1100b) may be formed on the inner or outer side of the flow channel (1020). The reflector (1100b) may be formed in both directions with respect to a fourth point (P4) on the inner or outer side of the flow channel (1020).

[0081] The reflector (1100b) may be formed at an angle of 45 degrees or less toward the first point (P1) relative to the fourth point (P4) of the flow channel (1020). The reflector (1100b) may be formed at an angle of 45 degrees or less toward the third point (P3) relative to the fourth point (P4) of the flow channel (1020). The reflector (1100b) may be formed at an angle of 90 degrees or less in both directions relative to the fourth point (P4) on the inside or outside of the flow channel (1020). The reflector (1100b) may be formed in a fan shape of 90 degrees or less relative to the fourth point (P4) of the flow channel (1020). The reflector (1100b) may be placed on the inside or outside of the flow channel (1020) in a fan shape of 90 degrees or less relative to the fourth point (P4) of the flow channel (1020).

[0082] Meanwhile, the water quality sensing device according to the present specification performs a turbidity performance evaluation based on a first turbidity value and a second turbidity value for a first scattered light and a second reflected light. In this regard, FIG. 5 is a graph showing the turbidity performance evaluation for the first scattered light and the second reflected light. Referring to FIG. 5, the X-axis and Y-axis represent turbidity and the ADC level, respectively. It shows the results of the first scattered light measurement by LED1, which is the first light source, and the second reflected light measurement by LED2, which is the second light source. In this regard, the results of the first scattered light measurement by LED1, which is the first light source, and the second absorbed light measurement by LED2, which is the second light source, may be shown. The ADC level is associated with the light reception characteristics of a detector (1330) implemented as a photo detector.

[0083] Referring to FIGS. 1 through 5, the ADC level represents a digital value converted from the analog values ​​of the first scattered light and the second reflected light, and can be output by the processor (1400). As the turbidity increases from ONTU to 1 NTU, the ADC level of the first scattered light for the first incident light of LED 1, which is the first light source (1310), can increase from 3300 to 3425. Referring to the ADC level of the first scattered light, it can correspond to the fourth region (R4) corresponding to the contamination state of FIG. 9.

[0084] As the turbidity increases from ONTU to 1 NTU, the ADC level of the second reflected light for the second incident light of LED 2, which is the second light source (1320), has a value within a predetermined range based on 3300. The ADC level of the second reflected light may have a different range outside the range of FIG. 7. If the ADC level of the second reflected light changes from the level of the ADC level of the first reflected light, it may correspond to a contamination state such as a biofilm, rather than an influence caused by foreign substances.

[0085] If the ADC level of the second reflected light changes from the level of the ADC level of the first reflected light, it can correspond to the fourth region (R4) corresponding to the contamination state of FIG. 9. The graph characteristics of FIG. 7 illustrate the change in turbidity due to water contamination. Other contamination characteristics can be distinguished by utilizing the one-dimensional linear characteristics by the first light source LED1 and the variability characteristics by the second light source LED2.

[0086] Meanwhile, with reference to FIG. 4(b) and FIG. 5, the intensity control of the second light source by the reflector (1100b) is described. As the reflector (1100b) is placed in a part of the first quadrant and a part of the second quadrant, the reflection ratio of the third reflected light to the incident light of the second light source (1320) increases compared to the structure of FIG. 4(a). The degree of surface contamination can be determined by comparing the third reflected light to the incident light of the second light source (1320) with the second reflected light due to surface contamination of the flow channel (1020).

[0087] Since the detector (1330) is positioned at the same location as the second light source (1320), the value of the third reflected light reflected at the fourth point (P4) of the flow path (1020) after passing through the interior of the flow path (1020) may be small. As the value of the third reflected light reflected through the reflector (1100b) increases, the intensity of the second light source (1320) can be adjusted to a level similar to the intensity of the first light source (1310).

[0088] If the intensity of the second light source (1320) is greater than the intensity of the first light source (1310) by a threshold level, the difference in the second reflected light when the turbidity increases due to an increase in foreign substances may appear greater than the slope of FIG. 5. If the intensity of the first light source (1310) is greater than the threshold level, it becomes impossible to distinguish whether the ADC level exceeding the normal level is due to surface contamination of the flow channel (1020) or an increase in turbidity due to an increase in foreign substances inside. Therefore, through the reflector (1100b), it is possible to distinguish whether the surface contamination of the flow channel (1020) or the increase in turbidity due to an increase in foreign substances inside is due to the second light source (1320), whose intensity is adjusted to a level similar to the intensity of the first light source (1310).

[0089] In summary, the reflector (1100) of FIG. 4(a) is a structure capable of increasing the value of the first scattered light detected through the detector (1330). The reflector (1100) of FIG. 4(a) can be formed into a first fan shape smaller than 90 degrees. For example, the reflector (1100) can be formed into a first fan shape of 60 degrees. The reflector (1100) can be formed into a first fan shape of 60 degrees ranging from 15 degrees to 75 degrees with respect to the X-axis.

[0090] The reflector (1100b) of FIG. 4(b) is a structure capable of increasing the value of the third reflected light detected when there is no foreign matter or the ratio of foreign matter is low. The reflector (1100b) of FIG. 4(b) can be formed into a second fan shape smaller than 90 degrees. For example, the reflector (1100b) can be formed into a second fan shape of 60 degrees. The reflector (1100b) can be formed into a first fan shape of 60 degrees, ranging from 60 degrees to 120 degrees with respect to the X-axis.

[0091] Meanwhile, FIG. 6 shows a structure in which a reflector is formed in a fan shape with an angle greater than 90 degrees across the first and second quadrants of the flow channel. Referring to FIG. 6, the reflector (1100) is shown as being placed inside the flow channel (1020), but it is not limited thereto and may be placed outside the flow channel (1020) as in FIG. 2.

[0092] Referring to FIG. 6, the reflector (1100c) is structured to increase the value of the first scattered light through the detector (1330) that detects it. Additionally, the reflector (1100c) is structured to increase the value of the third reflected light that detects it when there is no foreign substance detected or when the ratio of foreign substances is lower than a threshold ratio.

[0093] The reflector (1100c) can increase the value of the first scattered light to improve the accuracy of detecting foreign substances having a scattering component, and increase the value of the third reflected light to improve the accuracy of detecting foreign substances having a reflection component.

[0094] Meanwhile, as the size of the reflector (1100c) increases, the light component scattered in the boundary region of the reflector (1100c) may increase, or the asymmetry of the light path may increase slightly. Therefore, the size of the reflector (1100c) needs to be formed such that it is greater than 90 degrees and smaller than a critical angle in the upper region of the flow channel (1020).

[0095] The reflector (1100c) can be formed as a structure combining the reflector (1100) of FIG. 4(a) and the reflector (1100b) of FIG. 4(b). The reflector (1100) of FIG. 4(a) is a first fan shape with a 60-degree angle ranging from 15 to 75 degrees with respect to the X-axis. The reflector (1100b) of FIG. 4(b) is a second fan shape ranging from 15 to 60 to 120 degrees with respect to the X-axis. Accordingly, the reflector (1100c) can be formed as a third fan shape with a 105-degree angle ranging from 15 to 120 degrees with respect to the X-axis.

[0096] The reflector (1100c) may be formed in a third fan shape greater than 90 degrees and less than 120 degrees along the curved surface of the flow channel (1020) between the third point (P3) and the first point (P1) on the inner or outer side of the flow channel. The third point (P3) of the flow channel (1020) may be a point facing the first point (P1). The fourth point (P3) of the flow channel (1020) may be a point facing the second point (P2).

[0097] The reflector (1100c) may be formed in an asymmetrical structure in both directions based on a fourth point (P4) on the inner or outer side of the flow channel (1020). The first end of the reflector (1100c) may be formed adjacent to the third point (P3) of the flow channel (1020). The first end of the reflector (1100c) may be formed adjacent to the third point (P3) of the flow channel (1020) at an angle of 30 degrees or less. The second end of the reflector (1100c) may be formed spaced apart from the first point (P1) of the flow channel (1020) at an angle of 45 degrees or more.

[0098] In this regard, since the detector (1330) is positioned at the second point (P2) of the flow channel (1020) and not at the fourth point (P4), the reflector (1100b, 1100c) can be formed to include the fourth point (P4) as shown in FIG. 4(b) and FIG. 5. Accordingly, the water quality sensing device (1000) according to the present specification can effectively detect foreign substances having scattering and reflection components by optimally positioning two light sources and one detector in the lower region (one side region) and optimally positioning the reflector in the upper region (the other side region).

[0099] Specifically, the water quality sensing device (1000) has a structure in which two first light sources (1310) and a second light source (1320) are placed at a first point (P1) and a second point (P2) of the flow channel (1020), and a detector (1330) is placed at the second point (P2) of the flow channel (1020). In this regard, reflectors (1100, 1100b, 1100c) in various forms can be placed in the upper region of the flow channel (1020).

[0100] Meanwhile, the detailed structure of the water quality sensing device (1000) according to the present specification is described. The water quality sensing device (1000) may be configured to selectively emit light from different first light sources (1310) and second light sources (1320). In this regard, FIG. 7 shows a detailed block diagram of the water quality sensing device of FIG. 2. With reference to FIG. 1 to FIG. 7, the water quality sensing device (1000) according to the present specification is described.

[0101] The water quality sensing device (1000) may be configured to further include a switch (1410). Light emission control is possible so that either the first light source (1310) or the second light source (1320) is selectively emitted by the switch (1410). In this regard, the switch (1410) may be configured to control a first light emission state of the first light source (1310) and a second light emission state of the second light source (1320). To cause the first light source (1310) or the second light source (1320) to emit light, the switch (1410) may be implemented as a single pole double throw (SPDT) switch.

[0102] The processor (1400) can control the switch (1410) so that the first light source (1310) is turned on so that the first light is emitted into the inner region of the flow channel (1020). The processor (1400) can control the detector (1330) to detect scattered light of the first light and measure the first turbidity value. The processor (1400) can control the switch (1410) so that the second light source (1320) is turned on so that the second light is emitted into the inner region of the flow channel (1020). The processor (1400) can control the detector (1330) to detect reflected light of the second light and measure the second turbidity value.

[0103] The processor (1400) can calculate the turbidity value of the internal region of the flow channel (1020) based on the measured first turbidity value and second turbidity value. Accordingly, by implementing a sensor that detects a low turbidity signal at the level of drinking water (≤ 3 NTU) through the water quality sensing device (1000) according to the present disclosure, turbidity can be calculated and flow channel contamination can be detected. Here, NTU stands for Nephelometry Turbidity Unit. Turbidity indicates the degree of cloudiness of water caused by suspended solids, etc. in the water. Specifically, turbidity is defined as 1 NTU when 2.5 mL of a turbidity standard stock solution containing hydrazine sulfate and hexamethylenetetramine is dissolved in 1 L of distilled water.

[0104] Meanwhile, the water quality sensing device according to the present disclosure can perform light emission control of the first and second light sources and detection of scattered light / reflected light in a time division method. In this regard, FIG. 8 shows a conceptual diagram in which light emission control of the first and second light sources and detection of the first scattered light and the second reflected light are performed in a time division method.

[0105] Referring to FIG. 8, light emission control of the first and second light sources and detection of the first scattered light and the second reflected light can be performed in a time division manner. During the first time interval (T1), light emission control can be performed with the first light source (1310) in an ON state and the second light source (1320) in an OFF state. During the second time interval (T1) following the first time interval (T1), the first scattered light for the first incident light of the first light source (1310) can be detected to measure the first turbidity value.

[0106] The first light source (1310) may be switched to an off state before the start of the third time interval (T3). The second light source (1320) may be switched to an on state after the start of the third time interval (T3). Therefore, only the first scattered light from the first light source (1310) can be detected during the second time interval (T1). Since the propagation directions of the first incident light and the first scattered light from the first light source (1310) are 90 degrees apart, interference between them can be ignored.

[0107] During the third time interval (T3) following the second time interval (T2), light emission control can be performed with the first light source (1310) in the ON state and the second light source (1320) in the OFF state. During the fourth time interval (T4) following the third time interval (T3), the second reflected light of the second incident light of the second light source (1320) can be detected to measure the second turbidity value. Therefore, only the second reflected light by the second light source (1320) can be detected during the fourth time interval (T4). The direction of travel of the second incident light and the second reflected light by the second light source (1320) differs by 180 degrees, and the second reflected light is detected by the detector (1330) during the fourth time interval (T4). On the other hand, during the fourth time interval (T4), the second incident light is not detected by the detector (1330) because it is in a state before being reflected by foreign matter.

[0108] Meanwhile, the second duration of the first light source (1310) in the off state may be formed to be longer than the first duration of the first light source (1310) in the on state. The third duration of the second light source (1320) in the off state may be formed to be longer than the fourth duration of the second light source (1320) in the on state.

[0109] Referring to FIGS. 1 to 8, a water quality sensing device (1000) that performs light emission control of the first and second light sources and detection of scattered light / reflected light in a time division method is described. A processor (1400) can control the second light source (1320) to an off state during a first time interval (T1) in which the first light source (1310) is in an on state. The processor (1400) can control the measurement of a first turbidity value during a second time interval (T2) following the first time interval (T1). The first light source (1310) may remain in an on state during a certain time interval of the second time interval (T2), and the first light source (1310) may be switched to an off state before the start of the third time interval (T3). The second light source (1320) may be switched to an on state after the start of the third time interval (T3).

[0110] The processor (1400) can control the first light source (1310) to an off state during a third time interval in which the second light source (1320) is in an on state. In this regard, the first light source (1310) may be switched to an off state after the start point of the third time interval. The processor (1400) can control the measurement of the second turbidity value during a fourth time interval following the third time interval. The second light source (1320) may be maintained in an on state during a certain time interval of the fourth time interval.

[0111] Meanwhile, the water quality sensing device (1000) may include a plurality of components to convert, amplify, and process a signal to calculate a turbidity value. In this regard, the water quality sensing device (1000) may be configured to further include a digital analog converter (DAC) (1420), an operational amplifier (1430), and a low pass filter (LPF) (1440).

[0112] A digital-to-analog converter (1420) may be placed between the processor (1400) and the switch (1410). The analog converter (1420) may receive a serial data signal (SDC) and a serial clock signal (SCL) from the processor (1400). The analog converter (1420) may be configured to transmit a control signal to control the first light source (1310) and the second light source (1320) through the switch (1410).

[0113] An operational amplifier (1430) may be connected to a detector (1330) and configured to amplify signals associated with the scattered light of the first light and the reflected light of the second light detected. A low-pass filter (1440) may be configured to filter the low-frequency signal components of the amplified signals and to transmit the filtered signal components to a processor (1400).

[0114] The water quality sensing device (1000) may be configured to further include a voltage divider (1450) and a power supply unit (1460). Through the voltage divider (1450), the voltage of the power supplied from the power supply unit (1460) can be converted into driving voltages to drive the processor (1400) and the operational amplifier (1430).

[0115] Meanwhile, the water quality sensing device (1000) can perform temperature control if it determines that the flow path (1020) is contaminated by condensation based on the first turbidity value from the first light and the second turbidity value from the second light. The water quality sensing device (1000) may be equipped with a thermistor (1340) for temperature measurement. Additionally, the water quality sensing device (1000) may be equipped with a clock oscillator (1350) to generate a control signal associated with the timing of controlling the first light source (1310) and the second light source (1320).

[0116] As described above, the water quality sensing device (1000) may be configured to further include a thermistor (1340) and a clock oscillator (1350). The thermistor (1340) may be operably coupled with a processor (1400). The thermistor (1340) may be configured to measure the temperature of an internal region of the flow channel (1020).

[0117] In this regard, the processor (1400) can determine whether the first turbidity value due to the scattered light of the first light or the second turbidity value due to the reflected light of the second light exceeds a threshold value. If the first turbidity value or the second turbidity value exceeds the threshold value, the processor (1400) can determine whether the flow path (1020) is contaminated by condensation. If the processor (1400) determines that the flow path (1020) is contaminated by condensation, it can control a temperature control device so that the temperature of the internal area of ​​the flow path (1020) is controlled.

[0118] The processor (1400) can determine whether the first turbidity value and the second turbidity value are in an abnormal state or a normal state if the first turbidity value and the second turbidity value are smaller than a threshold value. In this regard, FIG. 9 shows a graph for determining the water quality state through the distinction of two-dimensional turbidity patterns of the first turbidity value and the second turbidity value.

[0119] Referring to FIG. 9, the first turbidity value and the second turbidity value can be mapped to coordinates on the X-axis and Y-axis, respectively. In this regard, for a steady-state liquid with low turbidity, it moves along a turbidity regression equation in the form of a linear function, such as the first region (R1) of FIG. 5, and has a change in the turbidity value inherent to the water quality.

[0120] If the first and second turbidity values ​​follow a linear turbidity regression equation, the inside of the flow channel can be determined to be in a normal state. On the other hand, if the first and second turbidity values ​​do not follow a linear turbidity regression equation, the second region (R2) and the third region (R3) may be determined to be in an abnormal state or the fourth region (R4) to be in a contaminated state. In this regard, it is possible to detect abnormal water quality conditions through machine learning-based two-dimensional turbidity pattern classification.

[0121] The high-performance low-turbidity sensor utilizing machine learning techniques consists of a variable optical path composite structure employing LED1 and LED2, which serve as the first and second light sources. Each light source represents a structure designed to detect scattered and reflected light from water quality. This is because conventional methods based on simple scattered light structures have limitations in responding to environmental factors, such as the detection of foreign substances. Under conditions such as condensation in the flow channel, foreign substance contamination, or biofilms, scattered light cannot distinguish between simple water pollution and channel contamination. Therefore, since surface contamination of the flow channel is also counted as water pollution, composite detection involving scattered light characteristics as well as reflected or absorbed light is required.

[0122] Referring to FIGS. 1 to 9, a composite detection method for calculating water quality contamination distinct from surface contamination of a flow path (1020) is described. To implement the above-described method, scattered light is detected by positioning a first light source (1310) at a 90-degree angle to a detector (1330), which is a light receiving part. Absorbed light or reflected light can be detected by positioning a second light source (1320) at the same point at 0 degrees to the light receiving part and the detector (1330). The first light source (1310) and the second light source (1320) operate in a switching manner. When the first light source (1310) is in the ON state, the second light source (1320) is in the OFF state, and when the first light source (1310) is in the OFF state, the second light source (1320) is in the ON state.

[0123] Low-turbidity scattered light is detected through the first light source (1310), and the validity of the value received from the first light source (1310) is determined under the light emission conditions of the second light source (1320). If the conclusion is an abnormal value that is not due to pure water quality contamination, the presence of condensation or contamination of the waterway is determined according to the conditions. If condensation is present, temperature control is required, and in the case of waterway contamination, re-measurement is performed through waterway cleaning control, thereby allowing only the inherent contamination level of the water quality to be measured.

[0124] Referring to FIG. 9 and the following mathematical formula 1, the first detected value (T) detected from the received value according to the turbidity (X) of the first light source. LED1 (x)) can be expressed as a linear function. A second detected value (T) detected from the received value according to the turbidity (X) of the second light source. LED2 (x)) can be expressed as a linear function. The first detection value (T LED1 (x)) is the second detection value (T LED2 It can be expressed in terms of (x)) and the coefficients of a linear function.

[0125]

[0126] In mathematical formula 1, if the relationship between the linear functions TLED1(x) and TLED2(x) holds, it represents the basic water quality turbidity. On the other hand, if the relationship is unequal, it means that there are abnormal values ​​due to environmental pollution, and re-measurement through correction processing is required.

[0127] Meanwhile, if foreign substances such as biofilms are present inside the flow channel, values ​​deviating from the linear regression equation are output, which means that the water quality turbidity value is not the inherent value. Therefore, first and second turbidity values ​​deviating from the linear function turbidity regression equation, such as in the fourth region (R4), may be detected. In this regard, the first turbidity value may be detected as a value greater than the second turbidity value. For example, the first and second turbidity values ​​may be detected as values ​​of 3110 and 3361. Therefore, when foreign substances are removed through flow channel cleaning control, the flow moves to follow the linear function turbidity regression equation, such as in the first region (R1). Accordingly, the normal linear regression model is followed, making it possible to detect normal water quality turbidity.

[0128] With reference to FIGS. 1 through 9, a water quality sensor device (1000) according to the present specification is described. If the first turbidity value and the second turbidity value are smaller than a threshold value, the processor (1400) can determine whether the first turbidity value and the second turbidity value are in an abnormal state or a normal state. In this regard, the threshold value of the first turbidity value or the second turbidity value may be set to 4000. However, the threshold value of the first turbidity value or the second turbidity value is not limited to 4000 and can be changed depending on the application. The first turbidity value or the second turbidity value is a digitally converted value of the first voltage value and the second voltage value detected through the detector (1330). For example, a voltage value of up to 1.8V may be detected and converted into a 12-bit digital value. Accordingly, the digitally converted value of the voltage value of up to 1.8V corresponds to 4096.

[0129] The processor (1400) can determine whether the first turbidity value and the second turbidity value are in a normal state where a linear relationship of a first function holds, or in an abnormal state where they deviate from a linear relationship. If the first turbidity value and the second turbidity value are in a normal state, the processor (1400) can calculate the turbidity value of the internal region of the flow channel (1020) based on the first turbidity value and the second turbidity value. The normal state can be defined as a first region (R1) in which the first turbidity value and the second turbidity value are in a linear relationship of a first function on an XY plane with the first turbidity value and the second turbidity value as variables.

[0130] The processor (1400) can determine whether the internal area of ​​the flow channel (1020) is contaminated by foreign matter or biofilm if the first turbidity value and the second turbidity value are in an abnormal state. The abnormal state can be defined as a second area (R2) where the first turbidity value is greater than the first area (R1) or a third area (R3) where the second turbidity value is greater than the first area (R1) on an XY plane where the first turbidity value and the second turbidity value are variables.

[0131] If the internal region of the flow path (1020) is determined to be contaminated by foreign matter or biofilm, the processor (1400) can control the flow path of the flow path (1020) to be cleaned. In this regard, the contaminated state may be defined as a fourth region (R4) in which the first turbidity value and the second turbidity value are greater than the abnormal state of the third region on an XY plane with the first turbidity value and the second turbidity value as variables. The processor (1400) can control water to be introduced into the internal region of the flow path (1020) while the flow path of the flow path (1020) is cleaned.

[0132] Meanwhile, the water quality control device (1000) can calculate a turbidity value based on the first and second turbidity values ​​in a temperature-controlled state when the flow path (1020) is contaminated by condensation. In this regard, the processor (1400) can control the switch (1410) so that the first light source (1310) is turned on so that the first light is emitted into the internal region of the flow path (1020) in a temperature-controlled state. The processor (1400) can measure the first turbidity value by detecting the scattered light of the first light in the state where the first light source (1310) is turned on.

[0133] The processor (1400) can control the switch (1410) so that the second light source (1320) is turned on so that the second light is emitted into the inner region of the flow channel (1020) while the temperature is controlled. The processor (1400) can detect the reflected light of the second light and measure the second turbidity value. If the measured first turbidity value or the second turbidity value is in a normal state, the turbidity value of the inner region of the flow channel (1020) can be calculated based on the first turbidity value and the second turbidity value.

[0134] The processor (1400) can determine whether the internal area of ​​the flow channel (1020) is contaminated by foreign substances or biofilms if the first turbidity value and the second turbidity value are smaller than the threshold value. If it is determined that the internal area of ​​the flow channel (1020) is contaminated by foreign substances or biofilms, the processor (1400) can control the flow channel of the flow channel (1020) to be cleaned. Water can be controlled to be introduced into the internal area of ​​the flow channel (1020) while the flow channel of the flow channel (1020) is cleaned.

[0135] The processor (1400) can control the switch (1410) so that the first light source (1310) is turned on so that the first light is emitted into the inner region of the flow channel (1020) while water is introduced into the inner region of the flow channel (1020). The processor (1400) can measure the first turbidity value by detecting the scattered light of the first light while the first light source (1310) is turned on.

[0136] The processor (1400) can control the switch (1410) so that the second light source (1320) is turned on so that the second light is emitted into the inner region of the flow channel (1020) while water is introduced into the inner region of the flow channel (1020). The processor (1400) can measure the second turbidity value by detecting the reflected light of the second light while the second light source (1320) is turned on. If the measured first turbidity value or the second turbidity value is in a normal state, the processor (1400) can calculate the turbidity value of the inner region of the flow channel (1020) based on the first turbidity value and the second turbidity value.

[0137] A water quality sensing device (1000) according to one aspect of the present disclosure has been described above. A water quality sensing method according to another aspect of the present disclosure will be described below. In this regard, FIGS. 10 and FIGS. 11 show a flowchart of a water quality sensing method according to another aspect of the present specification. The water quality sensing method of FIGS. 10 and FIGS. 11 can be performed by a processor of the water quality sensing device of FIGS. 1 to 6. The descriptions of the configuration and operation of the water quality sensing device (1000) described above can be applied to the water quality sensing method below.

[0138] With reference to FIGS. 1 to 11, a water quality sensing method according to the present disclosure is described. The water quality sensing method may be performed by a processor (1400) of a water quality sensor device (1000). The water quality sensing method may include a first light source driving process (S110), a first turbidity value measurement process (S120), a second light source driving process (S130), a second turbidity value measurement process (S140), and a turbidity value calculation process (S300).

[0139] Through the first light source driving process (S110), a switch can be controlled to turn on the first light source coupled to the first point of the flow path so that the first light is emitted into the inner region of the flow path. Through the first turbidity value measurement process (S120), the scattered light of the first light scattered in the inner region of the flow path can be detected through a detector to measure the first turbidity value.

[0140] Through the second light source driving process (S130), a switch can be controlled to turn on the second light source coupled to the second point of the flow channel so that the second light is emitted into the inner region of the flow channel. Through the second turbidity value measurement process (S140), the second turbidity value can be measured by detecting the reflected light of the second light reflected from the surface of the flow channel through a detector. Through the turbidity value calculation process (S300), the turbidity value of the inner region of the flow channel can be calculated based on the first turbidity value and the second turbidity value.

[0141] In the first light source driving process (S110), the second light source can be controlled to an off state during a first time interval in which the first light source is in an on state. In the first turbidity value measurement process (S120), the first turbidity value can be measured during a second time interval following the first time interval. In the second light source driving process (S130), the first light source can be controlled to an off state during a third time interval in which the second light source is in an on state. In the second turbidity value measurement process (S140), the second turbidity value can be measured during a fourth time interval following the third time interval.

[0142] The water quality sensing method may be configured to further include a linearity determination process (S200). In the linearity determination process (S200), it may be determined whether the first turbidity value and the second turbidity value are in a steady state where a linear relationship of a first-order function is established, or in an abnormal state where they deviate from the linear relationship. If the first turbidity value and the second turbidity value are in an abnormal state, the water quality sensing method may be configured to perform an abnormal state control process (S1000).

[0143] The water quality sensing method may be configured to further include a threshold comparison process (S400). The water quality sensing method may perform an abnormal state control process (S1000) through the threshold comparison process (S400). Specifically, if the first turbidity value and the second turbidity value are in an abnormal state, the threshold comparison process (S400) may be performed. Through the threshold comparison process (S400), it may be determined whether the first turbidity value or the second turbidity value exceeds a threshold value in the abnormal state.

[0144] The water quality sensing method may include a first contamination state determination process (S410), a flow path cleaning process (S420), and a water injection process (S430). The water quality sensing method may include a second contamination state determination process (S510) and a temperature control process (S520).

[0145] If the first turbidity value and the second turbidity value do not exceed a threshold value, a first contamination state determination process (S410) may be performed. Through the first contamination state determination process (S410), it may be determined whether there is contamination by foreign substances or biofilm in the internal area of ​​the flow channel. If it is determined that there is contamination by foreign substances or biofilm in the internal area of ​​the flow channel, a flow channel cleaning process (S420) may be performed. If the first turbidity value and the second turbidity value are smaller than the threshold value, the flow channel of the flow channel may be controlled to be cleaned through the flow channel cleaning process (S420). A water injection process (S430) may be performed while the flow channel of the flow channel is cleaned. Through the water injection process (S430), water may be controlled to be injected into the internal area of ​​the flow channel.

[0146] If the first turbidity value and the second turbidity value are determined to be in a normal state through the linearity determination process (S200), the turbidity value calculation process (S300) may be performed. Through the turbidity value calculation process (S300), the turbidity value of the internal region of the flow channel can be calculated based on the first turbidity value and the second turbidity value.

[0147] If the first turbidity value or the second turbidity value exceeds the threshold value during the threshold comparison process (S400), the second contamination state determination process (S510) may be performed. Through the second contamination state determination process (S510), it may be determined whether the flow path is contaminated by condensation. If it is determined that the flow path is contaminated by condensation, the temperature control process (S520) may be performed. If the first turbidity value or the second turbidity value exceeds the threshold value, the temperature control device combined with the processor may be controlled through the temperature control process (S520) so that the temperature of the internal area of ​​the flow path is controlled.

[0148] The water quality sensing device and water quality sensing method according to the present specification have been described above. Below, a water purification device equipped with a water quality sensing device according to another aspect of the present specification will be described. In this regard, FIG. 12 shows the configuration of a water purification device equipped with a water quality sensing device according to another aspect of the present specification. The descriptions of the configuration and operation of the water quality sensing device (1000) and the water quality sensing method described above may be applied to the water purification device (100) equipped with the water quality sensing device (1000) below. The water quality sensing device (1000) of FIG. 12 may be applied to other home appliances, such as a washing machine, in addition to the water purification device (100).

[0149] Referring to FIG. 12, the water purification device (100) may be configured to include an inlet (1010), a water quality sensing device (1000), and a water supply port (1030). Referring to FIG. 1 through 12, a water purification device (100) having a water quality sensing device (1000) according to another aspect of the present specification will be described. The inlet (1010) may be formed to allow water to enter. The water quality sensing device (1000) may be configured to detect the turbidity of water flowing in through the flow path (1020) from the inlet (1010). The water quality sensing device (1000) may be placed in a portion of the pipe (1020a) where the inlet (1010) and the water supply port (1030) are formed. The water supply port (1030) may be formed to allow water with detected turbidity to flow out.

[0150] The water quality sensing device (1000) may be configured to include a water pipe (1020), an external light blocking part (1200), a first light source (1310), a second light source (1320), and a detector (1330). The water quality sensing device (1000) may include a processor (1400) or be configured to work in conjunction with the processor (1400).

[0151] The external light blocking part (1200) may be formed so that the flow channel (1020) is inserted into the interior of the external light blocking part (1200). The external light blocking part (1200) may be configured so that the inlet and outlet of the flow channel (1020) are exposed through the first side and the second side. A liquid, such as water, may be contained inside the flow channel (1020). The external light blocking part (1200) may be formed to surround the outside of the flow channel (1020).

[0152] A first light source (1310) may be coupled to a first point of the flow channel (1020). The first light source (1310) may be configured to emit a first light into the inner region of the flow channel (1020). A second light source (1320) may be coupled to a second point of the flow channel (1020). The second light source (1320) may be configured to emit a second light into the inner region of the flow channel (1020).

[0153] The detector (1330) may be configured to detect scattered light of the first light scattered in the internal region of the flow channel (1020). Additionally, the detector (1330) may be configured to detect reflected light of the second light reflected from the surface of the flow channel (1020). The processor (1400) may be operably coupled with the first light source (1310), the second light source (1320), and the detector (1330). The processor (1400) may be configured to measure the turbidity inside the flow channel (1020).

[0154] The water quality sensing device (1000) may be configured to further include a switch (1410) to control light emission so that either the first light source (1310) or the second light source (1320) emits light selectively. In this regard, the switch (1410) may be configured to control a first light emission state of the first light source (1310) and a second light emission state of the second light source (1320). To cause the first light source (1310) or the second light source (1320) to emit light, the switch (1410) may be implemented as a single pole double throw (SPDT) switch.

[0155] The processor (1400) can control the detector (1330) to detect scattered light of the first light and measure the first turbidity value. The processor (1400) can control the detector (1330) to detect scattered light of the first light and measure the first turbidity value. The processor (1400) can control the switch (1410) so that the second light source (1320) is turned on so that the second light is emitted into the inner region of the flow channel (1020). The processor (1400) can control the detector (1330) to detect reflected light of the second light and measure the second turbidity value. Based on the measured first turbidity value and the second turbidity value, the processor (1400) can calculate the turbidity value of the inner region of the flow channel (1020).

[0156] The processor (1400) can measure a first turbidity value by detecting the scattered light of the first light through the detector (1330). The processor (1400) can measure a second turbidity value by detecting the reflected light of the second light through the detector (1330). Based on the first turbidity value and the second turbidity value, the processor (1400) can calculate the turbidity value of the internal area of ​​the flow channel (1020) and detect whether the flow channel (1020) is contaminated. The processor (1400) can calculate the turbidity value of the internal area of ​​the flow channel (1020) based on the first turbidity value according to the detected scattered light of the first light and the reflected light of the detected second light, and detect whether the flow channel (1020) is contaminated.

[0157] The processor (1400) can determine whether the first turbidity value and the second turbidity value are in an abnormal state or a normal state. The processor (1400) can determine whether the first turbidity value and the second turbidity value are in a normal state where a linear relationship of a first function is established, or in an abnormal state where they deviate from a linear relationship. If the first turbidity value and the second turbidity value are in a normal state, the processor (1400) can calculate the turbidity value of the internal region of the flow channel (1020) based on the first turbidity value and the second turbidity value.

[0158] In an abnormal state, if the first turbidity value and the second turbidity value are smaller than the threshold value, the processor (1400) can control the flow path of the flow path (1020) to be cleaned. If the first turbidity value and the second turbidity value are in an abnormal state, the processor (1400) can determine whether the internal area of ​​the flow path (1020) is contaminated by foreign substances or biofilm. If it is determined that the internal area of ​​the flow path (1020) is contaminated by foreign substances or biofilm, the processor (1400) can control the flow path of the flow path (1020) to be cleaned. Additionally, the processor (1400) can control water to be introduced into the internal area of ​​the flow path (1020) while the flow path of the flow path (1020) is cleaned.

[0159] In an abnormal state, if the first turbidity value or the second turbidity value exceeds a threshold value, the processor (1400) can control a temperature control device coupled with the processor (1400) so that the temperature of the internal region of the flow channel (1020) is controlled. If it is determined that the flow channel (1020) is contaminated by condensation based on the first turbidity value from the first light and the second turbidity value from the second light, the water quality sensing device (1000) can perform temperature control.

[0160] In this regard, the processor (1400) can determine whether the first turbidity value due to the scattered light of the first light or the second turbidity value due to the reflected light of the second light exceeds a threshold value. If the first turbidity value or the second turbidity value exceeds the threshold value, the processor (1400) can determine whether the flow channel (1020) is contaminated by condensation. If it is determined that the flow channel (1020) is contaminated by condensation, the processor (1400) can control a temperature control device so that the temperature of the internal area of ​​the flow channel (1020) is controlled.

[0161] The above describes a water quality sensing device, a method, and a home appliance such as a water purification device including the same according to the present specification. The technical effects of the water quality sensing device, a method, and a home appliance such as a water purification device including the same according to the present specification are described as follows.

[0162] According to the present specification, it is possible to implement a water quality measuring device having a sensing function capable of detecting low turbidity water quality by utilizing scattered light and reflected light that are scattered and reflected from foreign substances with respect to incident light.

[0163] According to the present specification, real-time turbidity measurement is possible by using scattered light and reflected light scattered and reflected from foreign substances with respect to incident light to prevent time delay phenomena when estimating turbidity caused by foreign substances in a fluid.

[0164] According to the present specification, foreign substances having scattering and reflection components can be effectively detected by optimally placing two light sources and one detector in one side area of ​​the flow channel and optimally placing a reflector in the other side area.

[0165] According to the present specification, abnormal water quality conditions and pollution conditions can be effectively determined through a two-dimensional turbidity pattern by scattered light and reflected light.

[0166] According to the present specification, through machine learning-based two-dimensional turbidity pattern classification, the issue of false detection caused by water quality conditions such as biofilm and activated carbon of existing sensors in low turbidity areas applicable to drinking water appliances can be overcome.

[0167] According to the present specification, it is possible to detect water turbidity in drinking water appliances by preventing false detection caused by Euro contamination and ensuring the safety of drinking water through the detection of water turbidity itself.

[0168] According to the present specification, it is possible to prevent false detection caused by Euro contamination and reduce unnecessary replacement costs by setting a customized filter replacement cycle based on contamination standards through the detection of turbidity of the water quality itself.

[0169] According to the present specification, a low-cost water quality detection device can be manufactured using low-cost light-emitting diodes and photodiodes, and the application to home appliances can be expanded.

[0170] According to the present specification, a home appliance such as a water purification device capable of detecting low turbidity water quality and measuring turbidity in real time can be provided through an optimal structure of two light sources and one detector.

[0171] According to the present specification, it is possible to provide water quality control and customer reassurance services through real-time monitoring and measurement of water quality in home appliances such as water purification devices.

[0172] The foregoing detailed description should not be interpreted restrictively in all respects and should be considered exemplary. The scope of the invention shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention.

Claims

1. In a water quality sensing device, Euro Pavilion; An external light blocking member formed to surround the above-mentioned flow channel and configured such that the inlet and outlet of the above-mentioned flow channel are exposed through a first side and a second side; the external light blocking member is formed such that the above-mentioned flow channel is inserted into the interior of the external light blocking member; A first light source coupled to a first point of the above-mentioned flow channel and configured to emit a first light into the internal region of the above-mentioned flow channel; A second light source coupled to a second point of the above-mentioned flow channel and configured to emit a second light into the inner region of the above-mentioned flow channel; A detector configured to detect scattered light of the first light scattered in the internal region of the above-mentioned flow channel and to detect reflected light of the second light reflected from the surface of the above-mentioned flow channel; and A water quality sensor device comprising a processor operably coupled to the first light source, the second light source, and the detector, and configured to measure turbidity inside the flow channel based on the scattered light of the first light and the reflected light of the second light detected, and to detect whether the flow channel is contaminated.

2. In Paragraph 1, The first point to which the first light source is connected and the point to which the detector is connected are spaced apart at an angle of 90 degrees, and A water quality sensor device in which the second point combined with the second light source and the point combined with the detector are arranged at an angle of 0 degrees.

3. In Paragraph 1, It further includes a reflector formed between a third point and a fourth point on the inner or outer side of the above-mentioned Euro tube, and The third point of the above-mentioned flow channel is a point opposite to the first point of the above-mentioned flow channel, and The fourth point of the above-mentioned Euro conduit is a point opposite to the second point of the above-mentioned Euro conduit, and A water quality sensor device, wherein the reflector is formed in a first fan shape of 90 degrees or less along the curved surface of the flow channel between the third point and the fourth point of the flow channel.

4. In Paragraph 1, It further includes reflectors formed in both directions based on a fourth point on the inner or outer side of the above-mentioned Euro tube, and The fourth point of the above-mentioned Euro conduit is a point opposite to the second point of the above-mentioned Euro conduit, and A water quality sensor device in which the reflector is formed in a second fan shape of 90 degrees or less along the curved surface of the flow channel based on the fourth point of the flow channel.

5. In Paragraph 1, It further includes a reflector formed in a third fan shape greater than 90 degrees and less than 120 degrees along the curved surface of the flow channel between a third point on the inner or outer side of the flow channel and the first point, The above reflector is formed in an asymmetric structure in both directions based on a fourth point on the inner or outer side of the above flow channel, and The third point of the above-mentioned flow channel is a point opposite to the first point of the above-mentioned flow channel, and The fourth point of the above-mentioned Euro conduit is a point opposite to the second point of the above-mentioned Euro conduit, and A water quality sensor device, wherein the first end of the reflector is formed adjacent to the third point, and the second end of the reflector is formed spaced apart from the first point at an angle of 45 degrees or more.

6. In Paragraph 2, It further includes a switch configured to control the first light emission state of the first light source and the second light emission state of the second light source, and The above processor is, Control the switch so that the first light source is turned on so that the first light is emitted into the inner region, and Detecting the scattered light of the first light above to measure the first turbidity value, and Control the switch so that the second light source is turned on so that the second light is emitted into the inner region, and Detecting the reflected light of the second light above to measure the second turbidity value, and A water quality sensor device that calculates a turbidity value of the internal region based on the first turbidity value and the second turbidity value.

7. In Paragraph 6, The above processor is, During a first time interval in which the first light source is in an on state, the second light source is controlled to an off state, and The first turbidity value is measured during the second time interval following the first time interval, and During a third time interval in which the second light source is in the ON state, the first light source is controlled to the OFF state, and A water quality sensor device that measures the second turbidity value during a fourth time interval following the third time interval.

8. In Paragraph 6, A digital-to-analog converter disposed between the processor and the switch, receiving a serial data signal and a serial clock signal from the processor, and transmitting a control signal to control the first light source and the second light source through the switch; An operational amplifier connected to the detector and configured to amplify signals associated with the detected scattered light and reflected light; and A water quality sensor device further comprising a low-pass filter configured to filter the low-frequency signal components of the amplified signals and to transmit the filtered signal components to the processor.

9. In Paragraph 6, It further includes a thermistor coupled to the above processor and configured to measure the temperature of the internal region of the above-mentioned Euro tube, The above processor is, Determining whether the first turbidity value or the second turbidity value exceeds a threshold value, If the first turbidity value or the second turbidity value exceeds the threshold value, the presence of condensation contamination in the flow channel is determined, and A water quality sensor device that controls a temperature control device to control the temperature of the internal region of the above-mentioned flow path when it is determined that the condensation in the above-mentioned flow path is contaminated.

10. In Paragraph 9, The above processor is, If the first turbidity value and the second turbidity value are smaller than the threshold value, it is determined whether the first turbidity value and the second turbidity value are in a steady state where a linear relationship of a first-order function is established or in an abnormal state that deviates from the linear relationship, and A water quality sensor device that calculates a turbidity value of the internal region based on the first turbidity value and the second turbidity value when the first turbidity value and the second turbidity value are in a normal state.

11. In Paragraph 10, The above processor is, If the first turbidity value and the second turbidity value are in an abnormal state, determine whether the internal area is contaminated by foreign substances or biofilms, and If it is determined that the internal area is contaminated by foreign substances or the biofilm, the flow path of the fluid pipe is controlled to be cleaned, and A water quality sensor device that controls the inflow of water into the internal region of the above-mentioned flow path while the flow path of the above-mentioned flow path is cleaned.

12. In Paragraph 11, The threshold value of the first turbidity value or the second turbidity value is set to 4000, and The above steady state is defined as a first region in which the first turbidity value and the second turbidity value establish a linear relationship of the first function. The above abnormal state is defined as a second region where the first turbidity value is greater than the first region, or a third region where the second turbidity value is greater than the first region, and A water quality sensor device in which the above contamination state is defined as a fourth region in which the first turbidity value and the second turbidity value are greater than the above abnormal state of the third region.

13. In Paragraph 10, The above processor is, Control the switch so that the first light source is turned on so that the first light is emitted into the internal region while the temperature of the internal region is controlled, and Detecting the scattered light of the first light above to measure the first turbidity value, and Control the switch so that the second light source is turned on so that the second light is emitted into the inner region, and Detecting the reflected light of the second light above to measure the second turbidity value, and A water quality sensor device that calculates a turbidity value of the internal region based on the first turbidity value and the second turbidity value when the measured first turbidity value or the second turbidity value is in a normal state.

14. In Paragraph 10, The above processor is, If the first turbidity value and the second turbidity value are smaller than the threshold value, it is determined whether the internal area is contaminated by foreign substances or biofilms, and If it is determined that there is contamination by foreign substances in the internal area or by the biofilm, the flow path of the fluid pipe is controlled to be cleaned, and A water quality sensor device that controls the inflow of water into the internal region of the above-mentioned flow path while the flow path of the above-mentioned flow path is cleaned.

15. In Paragraph 14, The above processor is, Control the switch so that the first light source is turned on so that the first light is emitted into the internal region while water is introduced into the internal region, and Detecting the scattered light of the first light above to measure the first turbidity value, and Control the switch so that the second light source is turned on so that the second light is emitted into the inner region, and Detecting the reflected light of the second light above to measure the second turbidity value, and A water quality sensor device that calculates a turbidity value of an internal region based on the first turbidity value and the second turbidity value, if the measured first turbidity value or second turbidity value is in a normal state.

16. In a water quality sensing method, the method is performed by a processor of a water quality sensor device, and the method is, A first light source driving process that controls a switch to turn on a first light source coupled to a first point of the flow path so that the first light is emitted into the internal region of the flow path; A first turbidity value measurement process for measuring a first turbidity value by detecting the scattered light of the first light scattered in the above internal region through a detector; A second light source driving process for controlling the switch to turn on the second light source coupled to the second point of the flow channel so that the second light is emitted into the inner region; A second turbidity value measurement process for measuring a second turbidity value by detecting the reflected light of the second light reflected from the surface of the above-mentioned Euro tube through the detector; and A water quality sensing method comprising a turbidity value calculation process for calculating a turbidity value of the internal region based on the first turbidity value and the second turbidity value.

17. In Paragraph 16, A linearity determination process for determining whether the first turbidity value and the second turbidity value are in a steady state or an abnormal state in which a linear relationship of a first-order function is established; and It further includes a threshold comparison process for determining whether the first turbidity value or the second turbidity value exceeds a threshold value in the above abnormal state, and A water quality sensing method that calculates a turbidity value of an internal region based on the first turbidity value and the second turbidity value when the first turbidity value and the second turbidity value are in a normal state.

18. In Paragraph 17, A flow path cleaning control process that controls the flow path of the flow path pipe to be cleaned when the first turbidity value and the second turbidity value are smaller than a threshold value; A water injection process for controlling the injection of water into the internal region of the above-mentioned flow channel while the flow channel of the above-mentioned flow channel is in a cleaned state; and A water quality sensing method comprising a temperature control process for controlling a temperature control device to control the temperature of the internal region of the flow channel when the first turbidity value or the second turbidity value exceeds the threshold value.

19. In a water purification device, An inlet formed to allow water to enter; A water quality sensing device configured to detect the turbidity of water flowing in through a flow path from the above-mentioned inlet; and It includes a water supply port formed to allow the water with detected turbidity to flow out, and The above water quality sensing device is, An external light blocking member formed to surround the above-mentioned flow channel and configured such that the inlet and outlet of the above-mentioned flow channel are exposed through a first side and a second side; the external light blocking member is formed such that the above-mentioned flow channel is inserted into the interior of the external light blocking member; A first light source coupled to a first point of the above-mentioned flow channel and configured to emit a first light into the internal region of the above-mentioned flow channel; A second light source coupled to a second point of the above-mentioned flow channel and configured to emit a second light into the inner region of the above-mentioned flow channel; A detector configured to detect scattered light of the first light scattered in the internal region of the above-mentioned flow channel and to detect reflected light of the second light reflected from the surface of the above-mentioned flow channel; and It includes a processor operably coupled to the first light source, the second light source, and the detector, and configured to measure the turbidity of the internal region of the flow channel, The above processor is, The scattered light of the first light is detected through a detector to measure the first turbidity value, and The reflected light of the second light is detected through the detector to measure the second turbidity value, and A water purification device that calculates the turbidity value of the internal area based on the first turbidity value and the second turbidity value, and detects whether the flow path is contaminated.

20. In Paragraph 19, The above processor is, Determining whether the first turbidity value and the second turbidity value are in a steady state where a linear relationship of a first-order function is established, or in an abnormal state where they deviate from the linear relationship, If the first turbidity value and the second turbidity value are in a normal state, the turbidity value of the internal region is calculated based on the first turbidity value and the second turbidity value, and In the above abnormal state, if the first turbidity value and the second turbidity value are smaller than the threshold value, the flow path of the flow path pipe is controlled to be cleaned, and Controls the inflow of water into the internal region of the above-mentioned flow channel while the flow channel of the above-mentioned flow channel is in a cleaned state, and A water purification device that controls a temperature control device so that the temperature of the internal region of the above flow channel is controlled when the above abnormal state, the above first turbidity value or the above second turbidity value exceeds a threshold value.

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