Dual-wavelength single-optical-path detection device for water quality monitoring
By designing a dual-wavelength single-path detection device with the same optical path, the problem of inconsistent absorbance caused by inconsistent optical paths is solved, and the accuracy and stability of water quality monitoring are improved.
Patent Information
- Application Number
- CN202422288173.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The existing dual-wavelength and dual-path detection devices lead to inconsistent absorbance when the optical path is inconsistent, affecting measurement accuracy and stability.
A dual-wavelength single-path detection device is used to eliminate optical path differences and ensure consistent absorbance through the main wavelength and auxiliary wavelength optical path design of the same optical path.
Improve the accuracy and stability of water quality monitoring and reduce the interference of turbidity on measurement results.
Smart Images
Figure CN223229460U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water quality monitoring, in particular to a dual-wavelength single-light-path detection device for water quality monitoring. Background Art
[0002] Natural water contains suspended matter and colloids such as mud, silt, fine organic matter, inorganic matter, and plankton. These substances can cause the water to become turbid, resulting in a certain degree of turbidity. The degree of turbidity is related to the suspended matter content in the water. Conventional monitoring data shows that the turbidity of major rivers and lakes in China is generally below 50 NTU. Some heavily polluted water bodies fluctuate between 50 and 400 NTU, and during flood seasons, it can reach 500-1000 NTU or even higher. Online monitoring instruments are mostly based on spectrophotometry. Excessive turbidity in surface water samples will result in excessive absorbance at characteristic wavelengths, significantly affecting the instrument's measurement accuracy, thus seriously affecting the accuracy of online data and the management department's assessment of water quality.
[0003] The dual-wavelength method can reduce the interference of turbidity on spectrophotometric monitoring instruments. Specifically, the absorbance of the test liquid is measured at both the primary and auxiliary wavelengths. The measured absorbance at the primary wavelength is then compensated for the absorbance at the auxiliary wavelength to produce a turbidity-compensated test result. However, existing technologies generally use dual-wavelength, dual-path detection devices. This results in different optical paths for the primary and auxiliary wavelength detection. If the test liquid or glass cuvette is inconsistent in these two optical paths, the consistency of the absorbance measured at the dual wavelengths will be affected, resulting in erroneous calculation results. Utility Model Content
[0004] In response to the above-mentioned deficiencies in the related existing technologies, the present application provides a dual-wavelength single-optical path detection device for water quality monitoring, which eliminates the interference of test absorbance caused by different optical path lengths, ensures the consistency of absorbance measured by dual wavelengths, improves test accuracy and stability, and has strong practicality.
[0005] In order to achieve the above purpose, the utility model adopts the following technologies:
[0006] A dual-wavelength single-light-path detection device for water quality monitoring comprises a frame and a light emitting component.
[0007] A cavity is provided inside the frame, a colorimetric cell is provided in the cavity, and through holes are provided on both sides of the cavity; the light emitting component includes a fixing sleeve and a first light receiving diode respectively installed on both sides of the frame, and the fixing sleeve and the first light receiving diode are aligned with the through holes, a beam splitter is provided in the fixing sleeve, and the angle formed by the plane of the beam splitter and the axis of the colorimetric cell is 45°, a second light receiving diode and an auxiliary LED are respectively provided at the upper and lower ends of the fixing sleeve, a main LED is provided at the end of the fixing sleeve, and the axis of the main LED is coaxial with the axis of the through hole.
[0008] Furthermore, both ends of the colorimetric cell are connected to a gland, a valve joint is provided on the gland, a flow channel is provided in the gland, and the flow channel is communicated with the colorimetric cell and the valve joint.
[0009] Furthermore, a recess is provided in the fixing sleeve, the beam splitter is located in the recess and is installed on one end of the fixing tube. One end of the fixing tube is passed through the through hole, and a light path is provided along its axial direction with both ends passing through. The center of the beam splitter is located on the axis of the light path.
[0010] Furthermore, the second light receiving diode and the auxiliary LED are coaxially arranged, and the center of the beam splitter is located on the axis of the second light receiving diode and the auxiliary LED.
[0011] The beneficial effect of the utility model is that the main wavelength and the auxiliary wavelength are made to pass through the same optical path, thereby eliminating the interference of the test absorbance caused by different optical path lengths, ensuring the consistency of the absorbance measured by the dual wavelengths, reducing the interference of turbidity, and improving the test accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.
[0013] Figure 1 It is a schematic three-dimensional diagram of the overall structure of an embodiment of the present application.
[0014] Figure 2 This is a three-dimensional schematic diagram of the cross-sectional structure of an embodiment of the present application.
[0015] Figure 3 This is a schematic diagram of an exploded view of a light emitting component according to an embodiment of the present application. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.
[0017] like Figure 1-Figure 3 As shown, this example provides a dual-wavelength single-path detection device for water quality monitoring, including: a frame 1 and a light emitting component 2.
[0018] A cavity 11 is provided inside the frame 1, a colorimetric cell 12 is provided in the cavity 11, and through holes 13 are provided on both sides of the cavity 11; the light emitting assembly 2 includes a fixing sleeve 21 and a first light receiving diode 22 respectively mounted on both sides of the frame 1, and the fixing sleeve 21 and the first light receiving diode 22 are aligned with the through holes 13, a beam splitter 23 is provided in the fixing sleeve 21, and the angle formed between the plane of the beam splitter 23 and the axis of the colorimetric cell 12 is 45°, a second light receiving diode 24 and an auxiliary LED 25 are provided at the upper and lower ends of the fixing sleeve 21, a main LED 26 is provided at the end of the fixing sleeve 21, and the axis of the main LED 26 is aligned with the through holes 13. The line is coaxial with the axis of the through hole 13, the main LED 26 emits light of the main wavelength, which is usually the characteristic wavelength of the substance to be measured, that is, the wavelength with the largest absorbance, the auxiliary LED 25 emits light of the auxiliary wavelength, the beam splitter 23 can reflect 50% of the light and transmit 50% of the light, the second light receiving diode 24 receives the light reflected or transmitted from the beam splitter 23, and is used to monitor the changes in the light intensity of the main LED 26 and the auxiliary LED 25, and the first light receiving diode 22 receives the light transmitted or reflected from the beam splitter 23, and is used to obtain the respective absorbances of the liquid to be measured in the colorimetric cell 12 for the main wavelength and the auxiliary wavelength.
[0019] Specifically, both ends of the colorimetric cell 12 are connected to the pressure cover 14, which is provided with a valve connector 15. The pressure cover 14 is provided with a flow channel 16, which is connected to the colorimetric cell 12 and the valve connector 15, so as to facilitate the injection of the liquid to be tested into the colorimetric cell 12.
[0020] Specifically, a recess 27 is provided in the fixing sleeve 21, the beam splitter 23 is located in the recess 27, and is installed on one end of the fixing tube 28. One end of the fixing tube 28 is passed through the through hole 13, and a light path 29 is provided along its axial direction with both ends passing through it. The center of the beam splitter 23 is located on the axis of the light path 29.
[0021] Specifically, the second light receiving diode 24 and the auxiliary LED 25 are coaxially arranged, and the center of the beam splitter 23 is located on the axis of the second light receiving diode 24 and the auxiliary LED 25 .
[0022] The specific implementation is described as follows:
[0023] When the liquid to be tested is present in the cuvette 12, the main LED 26 is turned on. The emitted light passes through the beam splitter 23, the reflected light is received by the second light receiving diode 24, and the transmitted light passes through the cuvette 12 and is received by the first light receiving diode 22, thereby obtaining the absorbance of the liquid to be tested at the primary wavelength. The main LED 26 is then turned off, and the auxiliary LED 25 is turned on. The emitted light passes through the beam splitter 23, the transmitted light is received by the second light receiving diode 24, and the reflected light passes through the cuvette 12 and is received by the first light receiving diode 22, thereby obtaining the absorbance of the liquid to be tested at the auxiliary wavelength. By deducting the effect of the absorbance of the auxiliary wavelength from the absorbance of the primary wavelength, that is, by deducting the effect of turbidity, the corrected absorbance of the liquid to be tested can be obtained. Using a previously calibrated standard curve, the concentration of the substance to be tested in the liquid to be tested can be determined.
[0024] Since the above are only preferred embodiments of the present invention and are not intended to limit the present invention, it is obvious that those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Therefore, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims
1. A dual-wavelength single-path detection device for water quality monitoring, characterized in that: include: A frame (1) is provided with a cavity (11) therein, a colorimetric cell (12) is provided in the cavity (11), and through holes (13) are provided on both sides of the cavity (11); The light emitting assembly (2) comprises a fixing sleeve (21) and a first light receiving diode (22) respectively mounted on both sides of the frame (1), and the fixing sleeve (21) and the first light receiving diode (22) are aligned with the through hole (13), a beam splitter (23) is provided in the fixing sleeve (21), and the angle formed between the plane of the beam splitter (23) and the axis of the colorimetric cell (12) is 45°, a second light receiving diode (24) and an auxiliary LED (25) are respectively provided at the upper and lower ends of the fixing sleeve (21), and a main LED (26) is provided at the end of the fixing sleeve (21), and the axis of the main LED (26) is coaxial with the axis of the through hole (13).
2. The dual-wavelength single-path detection device for water quality monitoring according to claim 1, characterized in that: Both ends of the colorimetric cell (12) are connected to a pressure cover (14), a valve connector (15) is provided on the pressure cover (14), a flow channel (16) is provided in the pressure cover (14), and the flow channel (16) is in communication with the colorimetric cell (12) and the valve connector (15).
3. The dual-wavelength single-path detection device for water quality monitoring according to claim 1, characterized in that: A recess (27) is provided in the fixing sleeve (21), the beam splitter (23) is located in the recess (27) and is mounted on one end of a fixing tube (28), one end of the fixing tube (28) is passed through the through hole (13), and a light path (29) is provided along its axial direction with both ends passing through, and the center of the beam splitter (23) is located on the axis of the light path (29).
4. The dual-wavelength single-path detection device for water quality monitoring according to claim 1, characterized in that: The second light receiving diode (24) and the auxiliary LED (25) are coaxially arranged, and the center of the beam splitter (23) is located on the axis of the second light receiving diode (24) and the auxiliary LED (25).