Water quality detector

Abstract

The invention relates to the technical field of water quality detection, in particular to a water quality detector which comprises a shell, an electrical unit, a detection pool and a detection unit, the detection pool is positioned at one end of the shell with the opening; the detection unit is arranged in the detection pool, the emission and detection integrated module is arranged in the protection shell, the emission and detection integrated module is electrically connected with the circuit board, the emission and detection integrated module comprises a light emission device and a light detection device which are connected in series, the light emission device is used for emitting ultraviolet light, and the light reflection part is used for reflecting the ultraviolet light; and the light detection device is used for detecting the reflected ultraviolet light. The water quality detector effectively prevents the zero drift phenomenon of the light emitting device and the light detecting device, can truly reflect the water quality condition, and solves the problems that elements in an existing water quality detection device have the zero drift phenomenon, the data accuracy and reliability are low, the real condition of the water quality cannot be accurately reflected, and the detection cost is low. And the water quality detection device is inconvenient to use due to large volume.

Description

Technical Field

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

[0002] Water quality testing has been widely used in all aspects of life and has become an indispensable part of ensuring water safety, assessing water conditions and promoting environmental protection. Organic matter content is a common and key water quality indicator in water quality assessment.

[0003] According to the Beer-Lambert law, absorbance is proportional to the concentration of the absorbing substance and the optical path. Based on this law, the ultraviolet light transmittance can be measured, and then the absorbance can be calculated, and then the concentration of the absorbing substance can be inferred. The concentration of the absorbing substance actually represents the concentration of organic matter, and this value can be used to evaluate the degree of organic pollution in the water to be tested. Using the above principle, the existing water quality detection device is equipped with a UV emitter and a UV detector at two relative positions of the sample pool. The ultraviolet light emitted by the UV emitter passes through the water sample to be tested and is received by the UV detector. The UV light transmittance is obtained by measurement and calculation, and the organic pollution status in the water can be further analyzed and determined.

[0004] However, since the two components of this water quality detection device are set at different positions and connected to different circuits, there are differences in the current size and working temperature of the two components in the working state, which leads to zero point offset of the two components, errors in the measurement results, low accuracy and reliability of the data, and cannot accurately reflect the true condition of the water quality. In addition, the greater the absorbance, the higher the accuracy of the measurement result. When the absorbance is proportional to the optical path, the greater the optical path, that is, the distance from the ultraviolet emitter to the ultraviolet detector, the greater the absorbance. The distance from the ultraviolet emitter to the ultraviolet detector represents the length of the sample cell, which means that in order to obtain accurate measurement results, the length of the sample cell must be large enough, but this will increase the volume of the water quality detection device, causing inconvenience in use. Summary of the invention

[0005] The main purpose of the present invention is to provide a water quality detector, which effectively prevents the zero drift phenomenon of light emitting devices and light detecting devices, can truly reflect the water quality conditions, has the advantages of small size, high measurement result accuracy, reasonable and compact structure, easy to carry and convenient to use, and solves the problems of zero drift phenomenon of components in existing water quality detection devices, low data accuracy and reliability, inability to accurately reflect the true condition of water quality, and inconvenience in use caused by the large size of water quality detection devices.

[0006] To achieve the above-mentioned purpose, the water quality detector proposed in the present invention comprises a shell having a hollow interior and an opening at one end, an electrical unit, a detection pool and a detection unit;

[0007] The electrical unit is disposed in the housing, and the electrical unit includes a circuit board;

[0008] The detection pool is located at the end of the shell where the opening is provided, and a partition is provided at the end of the detection pool close to the shell to separate the shell and the detection pool into two independent spaces; a detection port is provided at the end of the detection pool away from the shell to allow the water sample to be filled into the detection pool;

[0009] The detection unit is arranged in the detection pool, and the detection unit includes a protective shell, an emission and detection integrated module and a reflective element. The protective shell and the reflective element are relatively arranged on both sides of the detection pool in the length direction and are respectively connected to the pool wall of the detection pool; the emission and detection integrated module is arranged in the protective shell, and the emission and detection integrated module is electrically connected to the circuit board. The emission and detection integrated module includes a light emitting device and a light detecting device connected in series, the light emitting device is used to emit ultraviolet light, the reflective element is used to reflect the ultraviolet light, and the light detecting device is used to detect the reflected ultraviolet light.

[0010] Optionally, the circuit board includes a main board and a sub-board, the main board is arranged in the housing, the sub-board is arranged at one end of the main board close to the detection pool, and the sub-board passes through the partition and the protective shell and is connected to the light emitting device and the light detecting device;

[0011] The light emitting device and the light detecting device are connected to a side of the sub-plate close to the reflective element, and the light emitting device and the light detecting device are spaced apart on the sub-plate along a height direction of the detection pool.

[0012] Optionally, the reflective element is a reflective plate.

[0013] Optionally, a sample inlet is provided on a side wall in the width direction of the detection pool, so that the water sample to be tested enters the detection pool from the sample inlet.

[0014] Optionally, the light emitting device is an ultraviolet light emitting diode, and the light detecting device is an ultraviolet detector.

[0015] Optionally, the detection unit also includes a TDS detection module and a temperature detection module; the TDS detection module includes two TDS probes; the temperature detection module includes a temperature probe; the two TDS probes and the temperature probe are spaced apart on the partition, and the two TDS probes and the temperature probe are electrically connected to the circuit board after passing through the partition respectively.

[0016] Optionally, the circuit board includes an MCU main chip, a current conversion circuit, a UV275 transmitting circuit, a UV275 receiving circuit, a TDS detection circuit and a temperature detection circuit. The current conversion circuit, the TDS detection circuit and the temperature detection circuit are electrically connected to the MCU main chip respectively, and the current conversion circuit is electrically connected to the UV275 transmitting circuit and the UV275 receiving circuit.

[0017] Optionally, the electrical unit further includes a power module, and an output end of the power module is electrically connected to the circuit board.

[0018] Optionally, the power module includes a battery pack, and the battery pack is arranged on one side of the circuit board.

[0019] Optionally, the water quality detector also includes an operating unit and a display unit, the operating unit includes a plurality of buttons, the display unit is used for information display, the display unit includes a display screen, the display screen and the plurality of buttons are electrically connected to the circuit board, the display screen and the plurality of buttons are respectively arranged on the outer surface of the shell, and the plurality of buttons are located on the same side of the display screen.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This water quality detector integrates the light emitting device and the light detecting device into an emission and detection integrated module. The light emitting device and the light detecting device are both located in a protective shell and are connected in series, so that the current flowing through the light emitting device and the light detecting device remains consistent, and thus their operating temperatures are also in the same state, which can effectively prevent the light emitting device and the light detecting device from zero drift, improve the accuracy and reliability of the measurement data, and can truly reflect the water quality conditions.

[0022] 2. This water quality detector uses the reflection principle. By setting a reflector, the ultraviolet light emitted from the light emitting device passes through the water sample to be tested and then hits the reflector. Under the reflection of the reflector, the ultraviolet light passes through the water sample to be tested again from the reflector and then hits the light detection device, realizing the emission-reflection-detection of ultraviolet light. Therefore, the ultraviolet light path of this water quality detector includes two distances, namely the distance between the light emitting device and the reflector, and the distance between the reflector and the light detection device, that is, the ultraviolet light path of this water quality detector is close to twice the length of the detection pool. The ultraviolet light path of the existing water quality detection device has only one distance, namely the distance from the ultraviolet emitter to the ultraviolet detector, that is, the ultraviolet light path is close to the length of the sample pool. Therefore, under the same light path conditions, the length of the detection pool of this water quality detector is smaller, and it can also have a larger ultraviolet light path at the same time, making the measurement result more accurate. This water quality detector has the advantages of small size, high accuracy of measurement results, reasonable and compact structure, easy to carry and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the top view of a water quality detector according to an embodiment of the present invention;

[0024] Figure 2 It is a front view structural schematic diagram of a detection pool of a water quality detector according to an embodiment of the present invention;

[0025] Figure 3 A side view of a circuit board and a detection pool of a water quality detector according to an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a shell of a water quality detector according to an embodiment of the present invention;

[0027] Figure 5 An optical path diagram of a water quality detector according to an embodiment of the present invention;

[0028] Figure 6 It is an optical path diagram of a water quality detector according to another embodiment of the present invention;

[0029] Figure 7 The schematic diagram is a circuit board of a water quality detector according to an embodiment of the present invention.

[0030] Wherein: 1. Shell; 11. Battery installation port; 2. Electrical unit; 21. Circuit board; 211. Main board; 212. Sub-board; 22. Power module; 221. Battery pack; 3. Detection cell; 31. Partition; 32. Detection port; 33. Inlet; 4. Detection unit; 41. Protective shell; 42. Emission and detection integrated module; 421. Light emitting device; 422. Light detection device; 43. Reflector; 44. TDS detection module; 441. TDS probe; 45. Temperature detection module; 451. Temperature probe; 46. Connecting seat; 5. Operation unit; 51. Button; 6. Display unit; 61. Display screen. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The invention provides a water quality detector.

[0036] In the embodiment of the present invention, Figure 1 and 2 As shown, the water quality detector comprises a housing 1 which is hollow inside and has an opening at one end, an electrical unit 2, a detection pool 3 and a detection unit 4;

[0037] The electrical unit 2 is disposed in the housing 1 , and the electrical unit 2 includes a circuit board 21 ;

[0038] The detection pool 3 is located at one end of the shell 1 with an opening, and a partition 31 is provided at one end of the detection pool 3 close to the shell 1 to separate the shell 1 and the detection pool 3 into two independent spaces; a detection port 32 is provided at one end of the detection pool 3 away from the shell 1 to allow the water sample to be filled into the detection pool 3;

[0039] The detection unit 4 is arranged in the detection pool 3, and the detection unit 4 includes a protective shell 41, an emission and detection integrated module 42 and a reflector 43. The protective shell 41 and the reflector 43 are relatively arranged on both sides of the length direction of the detection pool 3 and are respectively connected to the pool wall of the detection pool 3; the emission and detection integrated module 42 is arranged in the protective shell 41, and the emission and detection integrated module 42 is electrically connected to the circuit board 21, and the emission and detection integrated module 42 includes a light emitting device 421 and a light detecting device 422 connected in series, the light emitting device 421 is used to emit ultraviolet light, the reflector 43 is used to reflect ultraviolet light, and the light detecting device 422 is used to detect the reflected ultraviolet light.

[0040] The water quality detector integrates the light emitting device 421 and the light detecting device 422 into an emission and detection integrated module 42. The light emitting device 421 and the light detecting device 422 are both located in the protective shell 41 and are connected in series so that the current flowing through the light emitting device 421 and the light detecting device 422 are kept consistent, thereby making their operating temperatures reach the same state. This can effectively prevent the light emitting device 421 and the light detecting device 422 from zero drift, improve the accuracy and reliability of the measurement data, and truly reflect the water quality conditions. This water quality detector uses the reflection principle. By setting a reflector 43, the ultraviolet light emitted from the light emitting device 421 passes through the water sample to be tested and then hits the reflector 43. Under the reflection of the reflector 43, the ultraviolet light passes through the water sample to be tested again from the reflector 43 and then hits the light detection device 422, realizing emission-reflection-detection of ultraviolet light. Therefore, the ultraviolet light path of this water quality detector includes two distances, namely the distance between the light emitting device 421 and the reflector 43, and the distance between the reflector 43 and the light detection device 422, that is, the ultraviolet light path of this water quality detector is close to twice the length of the detection pool 3. The ultraviolet light path of the existing water quality detection device has only one distance, namely the distance from the ultraviolet emitter to the ultraviolet detector, that is, the ultraviolet light path is close to the length of the sample pool. Therefore, under the same light path conditions, the length of the detection pool 3 of this water quality detector is smaller, and it can also have a larger ultraviolet light path at the same time, so that the measurement result is more accurate. The water quality detector has the advantages of small size, high measurement accuracy, reasonable and compact structure, easy to carry and convenient to use. The water quality detector solves the problem of zero drift of components in existing water quality detection devices, low data accuracy and reliability, inability to accurately reflect the true condition of water quality, and inconvenience caused by large size of water quality detection devices.

[0041] To further explain, the protective shell 41 is made of a material that can allow ultraviolet light to penetrate, such as acrylic material.

[0042] like Figure 1 and 2 As shown, in one embodiment of the present application, the circuit board 21 includes a main board 211 and a sub-board 212. The main board 211 is arranged in the housing 1. The sub-board 212 is arranged at one end of the main board 211 close to the detection pool 3. The sub-board 212 passes through the partition 31 and the protective shell 41 and is connected to the light emitting device 421 and the light detecting device 422.

[0043] The light emitting device 421 and the light detecting device 422 are connected to one side of the sub-plate 212 close to the reflector 43 , and the light emitting device 421 and the light detecting device 422 are spaced apart from each other on the sub-plate 212 along the height direction of the detection pool 3 .

[0044] The light emitting device 421 and the light detecting device 422 are arranged on the sub-plate 212 at intervals along the height direction of the detection pool 3. Such a structural arrangement is reasonable and compact.

[0045] like Figure 5 As shown, in one embodiment of the present invention, the reflective element 43 is vertically arranged inside the detection pool 3, and the ultraviolet light emitted by the light emitting device 421 is emitted at a certain angle, passes through the reflective element 43, and then is emitted to the light detecting device 422 at a certain angle.

[0046] like Figure 6 As shown, in another embodiment of the present invention, the reflective element 43 is obliquely arranged inside the detection pool 3, and the ultraviolet light emitted by the light emitting device 421 is emitted in a horizontal direction (the horizontal direction is the length direction of the detection pool 3), passes through the reflective element 43, and then is emitted to the light detecting device 422 at a certain angle.

[0047] To further explain, the outer wall of the protective shell 41 and the outer wall of the reflective element 43 are connected to the pool wall of the detection pool 3, ensuring that the protective shell 41 and the reflective element 43 can be stably set inside the detection pool 3, and an enclosed space is formed inside the protective shell 41 to prevent the water sample to be tested from entering the protective shell 41 and causing damage to the emission and detection integrated module 42.

[0048] In one embodiment of the present application, the reflective element 43 is a reflective plate.

[0049] The reflector 43 is a reflective plate, which has a certain area and can reflect ultraviolet light in a larger range, further improving the intensity of ultraviolet light received by the light detection device 422 and ensuring the accuracy of the measurement result.

[0050] like Figure 1 and 2 As shown, in one embodiment of the present application, a sample inlet 33 is provided on the side wall of the detection pool 3 in the width direction, so that the water sample to be tested enters the detection pool 3 from the sample inlet 33 .

[0051] By providing the sample inlet 33 , the water sample to be tested can fill the interior of the detection pool 3 more quickly, ensuring that the water sample to be tested completely fills the interior of the detection pool 3 , thereby ensuring the accuracy of the measurement result and improving the detection efficiency.

[0052] Preferably, the number of injection ports 33 is 4. The 4 injection ports 33 are symmetrically arranged on the side wall of the detection pool 3, so that the water sample to be tested enters the detection pool 3 evenly from the 4 injection ports 33, avoiding the local concentration difference of the water sample in the detection pool 3, thereby improving the accuracy and reliability of the measurement.

[0053] In one embodiment of the present application, the light emitting device 421 is an ultraviolet light emitting diode, and the light detecting device 422 is an ultraviolet detector.

[0054] The light emitting device 421 is an ultraviolet light emitting diode, which can efficiently convert the electrical energy transmitted by the circuit board 21 into ultraviolet light energy, and has the advantages of high conversion efficiency and low energy consumption, and the ultraviolet light emitting diode has high durability and stability. The light detecting device 422 is an ultraviolet detector, which can sensitively detect the presence of ultraviolet light, has the advantage of fast response speed, and monitors the ultraviolet light reflected by the reflective member 43 in real time, thereby improving the accuracy of the measurement structure.

[0055] like Figure 1 and 2 As shown, in one embodiment of the present application, the detection unit 4 also includes a TDS detection module 44 and a temperature detection module 45; the TDS detection module 44 includes two TDS probes 441; the temperature detection module 45 includes a temperature probe 451; the two TDS probes 441 and the temperature probe 451 are spaced apart on the partition 31, and the two TDS probes 441 and the temperature probe 451 are electrically connected to the circuit board 21 after passing through the partition 31 respectively.

[0056] TDS value refers to the total dissolved solid content. The purer the water quality of the water sample to be tested, the lower its TDS value, and vice versa. Therefore, measuring the TDS value can be used to assess the degree of water pollution. By setting up a TDS detection module 44, the dissolved solid content in the tested water sample can be measured, and the conductivity data of the water sample can be obtained using two TDS probes 441, and the data can be further converted into a TDS value. By setting up a temperature detection module 45, the temperature in the water can be measured, and the water temperature information measured by the temperature probe 451 can be used to perform temperature compensation on the measurement results of the TDS detection module 44. Combining the TDS detection module 44 and the temperature detection module 45, the practicality of this water quality detector is improved.

[0057] In one embodiment of the present invention, the detection unit 4 further includes a connection seat 46, which is disposed on a side of the partition 31 away from the housing 1. The two TDS probes 441 and the temperature probe 451 pass through the connection seat 46 and the partition 31 and are then electrically connected to the circuit board 21. The connection seat 46 is provided to improve the sealing of the housing 1, to prevent the water sample to be tested from flowing from the detection pool 3 into the housing 1 due to poor sealing, thereby damaging the circuit board 21. At the same time, the connection seat 46 can improve the convenience of installing the TDS probe 441 and the temperature probe 451, and improve the assembly efficiency.

[0058] To further explain, the connection base 46 and the partition plate 31 are provided with corresponding through holes for the two TDS probes 441 and the temperature probe 451 to pass through and be fixedly installed.

[0059] To further explain, the temperature probe 451 is a thermistor temperature probe.

[0060] like Figure 7 As shown, in one embodiment of the present application, the circuit board 21 includes an MCU main chip, a current conversion circuit, a UV275 transmitting circuit, a UV275 receiving circuit, a TDS detection circuit and a temperature detection circuit. The current conversion circuit, the TDS detection circuit and the temperature detection circuit are electrically connected to the MCU main chip respectively, and the current conversion circuit is electrically connected to the UV275 transmitting circuit and the UV275 receiving circuit.

[0061] The current conversion circuit can process or convert the input current signal, the UV275 transmitting circuit can realize the light emitting device 421 to generate and emit UV275 wavelength ultraviolet light; the UV275 receiving circuit can realize receiving the UV275 ultraviolet light after passing through the water sample to be tested, and can measure the intensity change of the ultraviolet light after passing through the water sample to be tested, and convert it into an electrical signal for subsequent processing; the TDS detection circuit can realize the measurement of the conductivity of the water sample to be tested, so as to calculate the total dissolved solids (TDS) content of the water sample; the temperature detection circuit can realize the measurement of the temperature of the water sample to be tested. Therefore, the circuit board 21 can realize multi-parameter detection and improve the accuracy of the measurement results.

[0062] To further explain, the power supply supplies power to the MCU main chip, the MCU main chip detects the TDS value through the TDS detection circuit, detects the temperature through the temperature detection circuit, and controls the UV275 transmitting circuit through the current conversion circuit. The UV275 receiving circuit receives the ultraviolet signal and converts it into an electrical signal, which is then converted into a current signal through the current conversion circuit. The MCU receives this current signal and performs calculation processing. By calculating the attenuation of UV275 from emission to reception, the degree of water pollution is calculated.

[0063] like Figure 1 and 3 As shown, in one embodiment of the present application, the electrical unit 2 further includes a power module 22 , and an output end of the power module 22 is electrically connected to the circuit board 21 .

[0064] The power module 22 can provide stable electric energy for the circuit board 21, the light emitting device 421 and the light detecting device 422, so as to ensure the normal and stable operation of the water quality detector.

[0065] like Figure 1 and 3 As shown, in one embodiment of the present application, the power module 22 includes a battery pack 221 , and the battery pack 221 is disposed on one side of the circuit board 21 .

[0066] The power module 22 includes a battery pack 221, so that the water quality detector can operate without an external power supply, which greatly increases the portability and flexibility of the water quality detector. At the same time, the battery pack 221 is arranged on one side of the circuit board 21, which can simplify the design of the power module 22, making the structural design of the circuit board 21 and the power module 22 in the water quality detector more reasonable and compact, and also convenient for quick installation.

[0067] like Figure 4 As shown, in one embodiment of the present invention, a battery installation port 11 and an installation cover are provided at one end of the shell 1 away from the detection tank 3. The installation cover is detachably installed on the shell 1, and the installation cover and the partition 31 of the detection tank 3 together enclose the interior of the shell 1 to form a closed space. At this time, the installation cover can be opened to install or replace the battery pack 221, thereby providing power for the entire water quality detector.

[0068] like Figure 1 and 3 As shown, in one embodiment of the present application, the water quality detector also includes an operating unit 5 and a display unit 6, the operating unit 5 includes a plurality of buttons 51, the display unit 6 is used for information display, the display unit 6 includes a display screen 61, the display screen 61 and the plurality of buttons 51 are both electrically connected to the circuit board 21, the display screen 61 and the plurality of buttons 51 are respectively arranged on the outer surface of the shell 1, and the plurality of buttons 51 are all located on the same side of the display screen 61.

[0069] The operating unit 5 and the display unit 6 are provided to make it more convenient for testers to use the water quality tester for testing, and to obtain test data in real time after the test, so as to understand the water quality more intuitively.

[0070] Specifically, the operating unit 5 is provided to facilitate the startup, shutdown, start and end of the detection of the water quality detector.

[0071] In one embodiment of the present invention, the water quality detector also includes a protective cover, which cooperates with the shell 1 and covers the outside of the detection pool 3. When the water quality detector is not needed, the detection pool 3 and the detection unit 4 can be protected to avoid damage to the detection pool 3 and the detection unit 4, thereby further extending the service life of the water quality detector.

[0072] The working principle of an embodiment of the present invention is as follows:

[0073] Open the protective cover and insert the detection pool 3 into the water sample to be tested, so that the water sample to be tested fills the inside of the detection pool 3. The power supply provides electrical energy, and the circuit board 21 transmits electrical energy to the light emitting device 421. The light emitting device 421 emits ultraviolet light. After the ultraviolet light passes through the test water sample for the first time, it passes through the test water sample for the second time under the reflection of the reflector 43 and then is projected into the light detecting device 422. The light intensity received by the light detecting device 422 is recorded as I0. After the ultraviolet light emitted by the light emitting device 421 passes through the pure water for the first time, it passes through the pure water for the second time under the reflection of the reflector 43 and then is projected into the light detecting device 422. The light intensity received by the light detecting device 422 is recorded as I1. The absorbance of the test water sample A=lg(1 / T), where T is the transmittance, also known as the transmittance, T=I0 / I1. According to the Beer-Lambert law, A=KBC, where K is the absorption coefficient, which is related to the properties of the absorbing material and the wavelength λ of the incident light and is a fixed value; B is the thickness of the absorption layer, which is twice the distance L from the light emitting device 421 to the reflective element 43; C is the concentration of the absorbing material, so A=lg(1 / T)=lg(I1 / I0)=K2LC, and the concentration C of the absorbing material can be further calculated to determine and evaluate the degree of pollution of organic matter.

[0074] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A water quality detector, characterized in that: It includes a shell with a hollow interior and an opening at one end, an electrical unit, a detection cell and a detection unit; The electrical unit is disposed in the housing, and the electrical unit includes a circuit board; The detection pool is located at the end of the shell where the opening is provided, and a partition is provided at the end of the detection pool close to the shell to separate the shell and the detection pool into two independent spaces; a detection port is provided at the end of the detection pool away from the shell to allow the water sample to be filled into the detection pool; The detection unit is arranged in the detection pool, and the detection unit includes a protective shell, an emission and detection integrated module and a reflective element. The protective shell and the reflective element are relatively arranged on both sides of the detection pool in the length direction and are respectively connected to the pool wall of the detection pool; the emission and detection integrated module is arranged in the protective shell, and the emission and detection integrated module is electrically connected to the circuit board. The emission and detection integrated module includes a light emitting device and a light detecting device connected in series, the light emitting device is used to emit ultraviolet light, the reflective element is used to reflect the ultraviolet light, and the light detecting device is used to detect the reflected ultraviolet light.

2. The water quality detector according to claim 1, characterized in that: The circuit board includes a main board and a sub-board, wherein the main board is arranged in the housing, and the sub-board is arranged at one end of the main board close to the detection cell, and the sub-board passes through the partition and the protective shell and is connected to the light emitting device and the light detecting device; The light emitting device and the light detecting device are connected to a side of the sub-plate close to the reflective element, and the light emitting device and the light detecting device are spaced apart on the sub-plate along a height direction of the detection pool.

3. The water quality detector according to claim 1, characterized in that: The reflective member is a reflective plate.

4. The water quality detector according to claim 1, characterized in that: A sample inlet is provided on the side wall of the detection pool in the width direction, so that the water sample to be tested enters the detection pool from the sample inlet.

5. The water quality detector according to claim 1, characterized in that: The light emitting device is an ultraviolet light emitting diode, and the light detecting device is an ultraviolet detector.

6. The water quality detector according to claim 5, characterized in that: The detection unit also includes a TDS detection module and a temperature detection module; the TDS detection module includes two TDS probes; the temperature detection module includes a temperature probe; the two TDS probes and the temperature probe are arranged at intervals on the partition, and the two TDS probes and the temperature probe are electrically connected to the circuit board after passing through the partition respectively.

7. The water quality detector according to claim 6, characterized in that: The circuit board includes an MCU main chip, a current conversion circuit, a UV275 transmitting circuit, a UV275 receiving circuit, a TDS detection circuit and a temperature detection circuit. The current conversion circuit, the TDS detection circuit and the temperature detection circuit are electrically connected to the MCU main chip respectively, and the current conversion circuit is electrically connected to the UV275 transmitting circuit and the UV275 receiving circuit.

8. The water quality detector according to claim 1, characterized in that: The electrical unit further includes a power module, and an output end of the power module is electrically connected to the circuit board.

9. The water quality detector according to claim 8, characterized in that: The power module includes a battery pack, and the battery pack is arranged on one side of the circuit board.

10. The water quality detector according to claim 1, characterized in that: The water quality detector also includes an operating unit and a display unit. The operating unit includes a plurality of buttons. The display unit is used for information display. The display unit includes a display screen. The display screen and the plurality of buttons are electrically connected to the circuit board. The display screen and the plurality of buttons are respectively arranged on the outer surface of the shell, and the plurality of buttons are located on the same side of the display screen.

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