Turbidity detection device and method based on double-sensor calibration

Abstract

The invention discloses a turbidity detection device and method based on double-sensor calibration, a detection module is added at a laser light source module, laser is divided into two light paths in the vertical direction by a light source through a beam splitter, the first light path is incident to a circulation groove, the second light path is incident to a second detection module through a filter film, and the second detection module is used for detecting turbidity. The second detection module can detect the change condition of the laser light source in the environment, aging or other factors, data compensation can be carried out on the detection value of the first detection module according to the detection data of the second detection module, the detection accuracy is improved, and meanwhile, the device can also be applied to more detection environments.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality analysis, and more specifically, mainly to a turbidity detection device and method based on dual sensor calibration. Background Art

[0002] Turbidity is an important item in water quality testing. Turbidity measurement methods are usually divided into: nephelometry, visual turbidimetry and spectrophotometry. Among these three methods, nephelometry is widely used in the determination of water turbidity because of its rapid measurement and simple operation. It uses a specific light source to illuminate the water sample and uses a sensor to receive the scattered light at a 90-degree direction. When the water sample contains insoluble particles of different degrees, the scattered light will show different intensities. The turbidity value of the water quality can be calculated by detecting the scattered light of the water sample through a photoelectric sensor and converting it into an electrical signal. However, the laser light source required in the nephelometry method is affected by various environmental factors such as temperature, humidity, electromagnetic interference, mechanical vibration, and self-factors such as thermal expansion, loosening, aging, and optical path adjustment of optical components. The laser light source will be unstable, thereby affecting the effect of the scattered light presentation, and then causing the test results to have a large deviation, which reduces the accuracy and stability of the data. Therefore, further improvement of turbidity detection is needed. Summary of the invention

[0003] The purpose of the present invention is to provide a turbidity detection device and method based on dual sensor calibration in view of the above shortcomings, so as to solve the technical problems in the prior art that turbidity detection is easily affected by environmental changes and the detection accuracy is affected.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a turbidity detection device based on dual sensor calibration, comprising a main body shell, a water inlet, a sewage outlet, an incident port, and a detection port are arranged on the wall of the main body shell, and a flow slot is arranged on the upper side of the main body shell through a cover plate pressing a sealing ring;

[0006] A light trap partition plate is arranged in the middle of the flow slot to divide the flow slot;

[0007] A detection module 1 disposed on the detection port;

[0008] A laser light source module is arranged on the incident port, a calibration port is arranged on the front side of the laser light source module, and a beam splitter is arranged in the laser light source module at the calibration port;

[0009] A detection module 2 disposed on the calibration port;

[0010] The detection module 1, the detection module 2 and the laser light source module are electrically connected to an external control system through wires.

[0011] Furthermore, the laser light source module includes a light source main bracket, a light source bracket arranged in the light source main bracket, a laser light source arranged in the light source bracket, a pressing sheet arranged at the rear end of the laser light source, a calibration port arranged on the side of the front section of the light source main bracket, and a filter film arranged on the calibration port;

[0012] The top of the light source bracket extends to the calibration port and is provided with a spectrometer. A quartz lens is provided on the top of the front end of the main light source bracket. The pressing plate is electrically connected to the external control system through a wire. The laser light source divides the laser into two light paths in the vertical direction through the spectrometer. Light path one is incident on the flow slot, and light path two is incident on detection module two through the filter membrane.

[0013] Furthermore, an overflow port is provided on the upper portion of the main body shell wall.

[0014] Furthermore, the detection module 1 and the detection module 2 are both photoelectric sensor detection modules.

[0015] Furthermore, the photoelectric sensor detection module includes a PCBA bracket, which presses the rubber pad through the PCBA pressure cover and then presses the PCBA board fixedly arranged at the upper center of the PCBA bracket, a sealing joint arranged at the upper center of the PCBA pressure cover, a lens arranged at the bottom center of the PCBA bracket, and a sealing pad arranged at the outer circle of the bottom of the PCBA bracket. The PCBA board is electrically connected to the external control system through a wire passing through the sealing joint.

[0016] Furthermore, the light trap partition is provided with groove holes corresponding to the light path for light to pass through.

[0017] Furthermore, a spherical depression is provided on the inner wall of the main body shell, the position of which corresponds to the groove hole of the light trap partition.

[0018] Furthermore, the inner wall of the main body shell, the surface of the light trap partition, and the inner wall of the optical path channel of the laser light source module are all provided with a light absorbing layer.

[0019] In addition, a turbidity detection method is provided, using any of the above-mentioned turbidity detection devices based on dual sensor calibration, and the turbidity detection method comprises the following steps:

[0020] Step 1: Detection based on the standard solution with turbidity of XnNTU. First, use the standard light source intensity I0 to divide the laser into two light paths in the vertical direction through the beam splitter. Light path 1 is incident on the flow slot, and light path 2 is incident on the detection module 2 through the filter membrane; the scattered light signal of light path 1 in the calibration solution passes through the detection module 1 and outputs the data signal value R n1 1. R n2 1. R n3 1, ..., take the mean as R n 1, where Rn 1 corresponds to turbidity XnNTU; detection module 2 detects the light path 2 signal emitted from the spectrometer and outputs the data signal value R n1 2. R n2 2,

[0021] R n3 2, ..., take the mean as R n 2;

[0022] Step 2: Detect the turbidity of the target liquid, and the detection module 1 outputs the data signal value R n1 X, R n2 X,

[0023] R n3 X, ..., take the mean as R n X; detection module 2 output data signal value R n1 Y, R n2 Y, R n3 Y, ..., take the mean value as R n Y;

[0024] Step 3: Use the formula R = R n X*R n 2 / R n Y, get the corrected R value, and then get the corresponding turbidity value X through the corrected R value R .

[0025] Compared with the prior art, the beneficial effects of the present invention are: a detection module is added at the laser light source module, and the light source is divided into two light paths in the vertical direction through a beam splitter. Light path one is incident on the flow slot, and light path two is incident on detection module two through a filter membrane. Detection module two can detect changes in the laser light source due to environment, aging or other factors. Data compensation can be made for the detection value of detection module one based on the detection data of detection module two, thereby increasing the accuracy of detection. At the same time, it can also be applied to more detection environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of a turbidity detection device based on dual sensor calibration in an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the disassembly of a turbidity detection device based on dual sensor calibration in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the disassembly of the photoelectric sensor detection module in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the main body shell in an embodiment of the present invention.

[0030] The following are the descriptions of the reference numerals:

[0031] 1 is the main body shell, 101 is the spherical depression, 2 is the water inlet, 3 is the sewage outlet, 4 is the incident port, 5 is the detection port, 6 is the cover plate, 7 is the sealing ring, 8 is the flow slot, 9 is the light trap partition, 901 is the groove hole, 10 is the detection module one, 11 is the laser light source module, 12 is the detection module two, 13 is the overflow port, 1101 is the calibration port, 1102 is the spectrometer, 1103 is the main light source bracket, 1104 is the light source bracket, 1105 is the laser light source, 1106 is the pressing plate, 1107 is the filter film, 1108 is the quartz lens, 1401 is the PCBA bracket, 1402 is the PCBA pressure cover, 1403 is the rubber pad, 1404 is the PCBA board, 1405 is the sealing joint, 1406 is the lens, and 1407 is the sealing pad. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] refer to Figure 1 , Figure 2 As shown, the embodiment of the present invention is a turbidity detection device based on dual sensor calibration, comprising a main body shell 1, a water inlet 2, a sewage outlet 3, an incident port 4, and a detection port 5 are arranged on the wall of the main body shell 1, and a flow slot 8 is arranged on the upper side of the main body shell 1 through a cover plate 6 pressing a sealing ring 7;

[0034] A light trap partition 9 is arranged in the middle of the flow slot 8 to divide the flow slot 8;

[0035] A detection module 10 disposed on the detection port 5;

[0036] The laser light source module 11 is arranged on the incident port 4, a calibration port 1101 is arranged on the front side of the laser light source module 11, and a beam splitter 1102 is arranged in the laser light source module 11 at the calibration port 1101;

[0037] A detection module 2 12 disposed on the calibration port 1101;

[0038] The detection module 1 10, the detection module 2 12, and the laser light source module 11 are electrically connected to the external control system through wires;

[0039] In this design, a detection module is added at the laser light source module 11, and the light source is divided into two light paths in the vertical direction through the beam splitter 1102. Light path one is incident on the flow slot 8, and light path two is incident on the detection module 2 12. The detection module 2 12 can detect changes in the laser light source due to the environment, aging or other factors. According to the detection data of the detection module 2 12, data compensation can be made for the detection value of the detection module 10 to increase the accuracy of the detection. At the same time, it can also be applied to more detection environments.

[0040] A preferred embodiment is that the laser light source module 11 includes a light source main support 1103, a light source support 1104 arranged in the light source main support 1103, a laser light source 1105 arranged in the light source support 1104, a pressing piece 1106 arranged at the rear end of the laser light source 1105, a calibration port 1101 arranged on the side of the front section of the light source main support 1103, and a filter film 1107 arranged on the calibration port 1101;

[0041] The top of the light source bracket 1104 extends to the calibration port 1101 and is provided with a spectrometer 1102. A quartz lens 1108 is provided at the top of the front end of the main light source bracket 1103. The pressing plate 1106 is electrically connected to the external control system through a wire. The laser light source 1105 divides the laser into two light paths in the vertical direction through the spectrometer 1102. Light path one is incident on the flow slot 8, and light path two is incident on the detection module two through the filter film 1107.

[0042] In a preferred embodiment, an overflow port 13 is provided on the upper part of the wall of the main shell 1, and water will overflow naturally after flowing to a certain water level.

[0043] In a preferred embodiment, both the detection module 1 10 and the detection module 2 12 are photoelectric sensor detection modules, which can be commonly used detection devices on the market.

[0044] A preferred embodiment is to refer to Figure 3 As shown, the photoelectric sensor detection module includes a PCBA bracket 1401, a PCBA cover 1402 presses a rubber pad 1403 and then presses a PCBA board 1404 fixedly arranged at the upper center of the PCBA bracket 1401, a sealing joint 1405 arranged at the upper center of the PCBA cover 1402, a lens 1406 arranged at the bottom center of the PCBA bracket 1401, and a sealing pad 1407 arranged at the outer circle of the bottom of the PCBA bracket 1401. The PCBA board 1404 is electrically connected to the external control system through a wire passing through the sealing joint.

[0045] A preferred embodiment is that a groove hole 901 for light to pass through is arranged on the light trap partition 9 corresponding to the light path. The groove hole 901 is a conical bottom opening. Under the premise of ensuring the light absorption effect, the generation of bubbles can be reduced and cleaning is also convenient.

[0046] A preferred embodiment is to refer to Figure 4 As shown, a spherical depression 101 is provided on the inner wall of the main shell 1, the position of which corresponds to the groove hole 901 of the light trap partition 9, which can reduce the back reflection of laser through the light trap partition 9 and reduce the influence of stray light on the detection module 10.

[0047] In a preferred embodiment, the inner wall of the main body shell 1, the surface of the light trap partition 9, and the inner wall of the optical path of the laser light source module 11 are all provided with a light absorbing layer, which can effectively reduce the interference of stray light on the detection module.

[0048] In addition, a turbidity detection method is provided, which uses any of the above-mentioned turbidity detection devices based on dual sensor calibration, and the turbidity detection method comprises the following steps:

[0049] Step 1: Detection based on the standard solution with turbidity of XnNTU. First, use the standard light source intensity I0 to divide the laser into two light paths in the vertical direction through the beam splitter. Light path 1 is incident on the flow slot, and light path 2 is incident on the detection module 2 through the filter membrane; the scattered light signal of light path 1 in the calibration solution passes through the detection module 1 and outputs the data signal value R n1 1. R n2 1. R n3 1, ..., take the mean as R n 1, where R n 1 corresponds to turbidity XnNTU; detection module 2 detects the light path 2 signal emitted from the spectrometer and outputs the data signal value R n1 2. R n2 2,

[0050] R n3 2, ..., take the mean as R n 2;

[0051] Step 2: Detect the turbidity of the target liquid, and the detection module 1 outputs the data signal value R n1 X, R n2 X,

[0052] R n3 X, ..., take the mean as R n X; detection module 2 output data signal value R n1 Y, R n2 Y, R n3 Y, ..., take the mean value as R n Y;

[0053] Step 3: Use the formula R = R n X*R n 2 / R n Y, get the corrected R value, and then get the corresponding turbidity value X through the corrected R value R ;

[0054] The detection module 2 can detect the changes of the laser light source due to the environment, aging or other factors. According to the detection data of the detection module 2, the detection value of the detection module 1 can be compensated. The corresponding turbidity value X can be obtained through the compensated R value. R, which can effectively eliminate the influence of light source brightness changes on detection accuracy and increase detection accuracy.

[0055] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0056] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A turbidity detection device based on dual sensor calibration, Features: It includes a main body shell, on the wall of which a water inlet, a sewage outlet, an incident port, and a detection port are arranged, and a flow slot is arranged on the upper side of the main body shell through a cover plate pressing a sealing ring; A light trap partition plate is arranged in the middle of the flow slot to divide the flow slot; A detection module 1 disposed on the detection port; A laser light source module is arranged on the incident port, a calibration port is arranged on the front side of the laser light source module, and a beam splitter is arranged in the laser light source module at the calibration port; A detection module 2 disposed on the calibration port; The detection module 1, the detection module 2 and the laser light source module are electrically connected to an external control system through wires.

2. The turbidity detection device based on dual sensor calibration according to claim 1, Features: The laser light source module comprises a light source main support, a light source support arranged in the light source main support, a laser light source arranged in the light source support, a pressing sheet arranged at the rear end of the laser light source, a calibration port arranged at the side of the front section of the light source main support, and a filter film arranged on the calibration port; The top of the light source bracket extends to the calibration port and is provided with a spectrometer. A quartz lens is provided on the top of the front end of the main light source bracket. The pressing plate is electrically connected to the external control system through a wire. The laser light source divides the laser into two light paths in the vertical direction through the spectrometer. Light path one is incident on the flow slot, and light path two is incident on detection module two through the filter membrane.

3. The turbidity detection device based on dual sensor calibration according to claim 1, Features: An overflow port is arranged on the upper part of the main body shell wall.

4. The turbidity detection device based on dual sensor calibration according to claim 1, Features: The detection module 1 and the detection module 2 are both photoelectric sensor detection modules.

5. The turbidity detection device based on dual sensor calibration according to claim 4, Features: The photoelectric sensor detection module includes a PCBA bracket, a PCBA cover that presses the rubber pad and then presses the PCBA board fixedly arranged at the upper center of the PCBA bracket, a sealing joint arranged at the upper center of the PCBA cover, a lens arranged at the bottom center of the PCBA bracket, and a sealing pad arranged at the outer circle of the bottom of the PCBA bracket. The PCBA board is electrically connected to the external control system through a wire passing through the sealing joint.

6. The turbidity detection device based on dual sensor calibration according to claim 1, Features: The light trap partition is provided with groove holes corresponding to the light path for light to pass through.

7. The turbidity detection device based on dual sensor calibration according to claim 1, Features: The inner wall of the main body shell is provided with a spherical depression whose position corresponds to the groove hole of the light trap partition.

8. The turbidity detection device based on dual sensor calibration according to claim 1, Features: The inner wall of the main body shell, the surface of the light trap partition, and the inner wall of the optical path channel of the laser light source module are all provided with a light absorbing layer.

9. A turbidity detection method, It is characterized in that Using the turbidity detection device based on dual sensor calibration according to any one of claims 1 to 8, the turbidity detection method comprises the following steps: Step 1: Detection based on the standard solution with turbidity of XnNTU, first use the standard light source intensity I 0 , the laser is divided into two light paths in the vertical direction through the beam splitter. Light path one is incident on the flow slot, and light path two is incident on detection module two through the filter membrane; the scattered light signal of light path one in the calibration liquid passes through detection module one and outputs the data signal value R n1 1. R n2 1. R n3 1, ..., take the mean as R n 1, where R n 1 corresponds to turbidity XnNTU; detection module 2 detects the light path 2 signal emitted from the spectrometer and outputs the data signal value R n1 2. R n2 2, R n3 2, ..., take the mean as R n 2; Step 2: Detect the turbidity of the target liquid, and the detection module 1 outputs the data signal value R n1 X, R n2 X, R n3 X, ..., take the mean as R n X; detection module 2 output data signal value R n1 Y, R n2 Y, R n3 Y, ..., take the mean value as R n Y; Step 3: Use the formula R = R n X*R n 2 / R n Y, get the corrected R value, and then get the corresponding turbidity value X through the corrected R value R .

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