Dual-path self-calibrated absorption spectroscopy methane detector

Abstract

This utility model relates to the field of gas detection technology, and in particular to a dual-optical-path self-calibrating absorption spectroscopy methane detector, comprising a main body, a gas chamber, an exhaust unit, and a mounting cavity. The gas chamber is disposed on the main body, and the exhaust unit is also mounted on the main body and communicates with the gas chamber. The mounting cavity is disposed on the side of the main body away from the gas chamber, and a circuit board is mounted inside the mounting cavity. A breathable membrane is mounted on the surface of the main body where the gas chamber is located. The main body is also provided with an optical path generating opening A, an optical path receiving opening A, an optical path generating opening B, and an optical path receiving opening B. The optical path generating opening A and the optical path receiving opening B are symmetrically arranged, and the optical path generating opening B and the optical path receiving opening B are symmetrically arranged. This method solves the technical problems of weak anti-interference ability and insufficient measurement accuracy and stability caused by the single optical path design of existing optical absorption methane detectors.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a dual-optical-path self-calibrating absorption spectroscopy methane detector. Background Technology

[0002] In daily life, methane-containing gases such as natural gas are widely used as important energy sources, for example, for cooking and heating. However, methane gas is flammable and explosive; leaks can cause fires, explosions, and other serious safety accidents, posing a significant threat to the lives and property of family members. Therefore, accurate and timely detection of methane gas concentration in the home environment is crucial. Currently, optical absorption methane detectors are an important gas detection method and have been applied to some extent in the field of home safety monitoring. Their basic principle is based on the absorption characteristics of methane gas to light of specific wavelengths. By measuring the change in light intensity before and after passing through a methane-containing environment, the concentration of methane gas can be calculated.

[0003] However, existing optical absorption methane detectors suffer from weak anti-interference capabilities and insufficient measurement accuracy and stability due to their single optical path design. Utility Model Content

[0004] The purpose of this invention is to provide a dual-optical-path self-calibrating absorption spectroscopy methane detector, which aims to solve the technical problems of weak anti-interference ability, insufficient measurement accuracy and stability caused by the single optical path design of existing optical absorption methane detectors.

[0005] To achieve the above objectives, this utility model employs a dual-optical-path self-calibrating absorption spectroscopy methane detector, comprising a main body, a gas chamber, a gas outlet unit, and a mounting cavity. The gas chamber is disposed on the main body, and the gas outlet unit is also mounted on the main body and communicates with the gas chamber. The mounting cavity is disposed on the side of the main body away from the gas chamber, and a circuit board is mounted inside the mounting cavity.

[0006] A breathable membrane is installed on the surface of the main body where the gas chamber is formed;

[0007] The main body is also provided with an optical path generating opening A, an optical path receiving opening A, an optical path generating opening B, and an optical path receiving opening B. The optical path generating opening A and the optical path receiving opening B are symmetrically arranged. A light source generator and a light source receiver are respectively installed in the optical path generating opening A and the optical path receiving opening A. Similarly, a light source generator and a light source receiver are respectively installed in the optical path generating opening B and the optical path receiving opening B.

[0008] The optical path generating opening B and the optical path receiving opening B are located below the optical path generating opening A and the optical path receiving opening A.

[0009] The air outlet unit includes multiple air outlets, all of which are disposed on the main body.

[0010] The dual-path self-calibrating absorption spectroscopy methane detector further includes two first grooves and two second grooves. The two first grooves are respectively connected to the light path generating opening A and the light path receiving opening A, and the two second grooves are respectively connected to the light path generating opening B and the light path receiving opening B.

[0011] This invention discloses a dual-path self-calibrating absorption spectroscopy methane detector. In practical use, the light-generating opening A and the light-receiving opening A are used for the long optical path, while the light-generating opening B and the light-receiving opening B are used for the short optical path. Gas enters the gas chamber through a permeable membrane. At this time, a light source generator and a light source receiver for the short optical path are respectively installed in the light-generating opening B and the light-receiving opening B to detect high-concentration gas. When the methane gas concentration is high, the short optical path can respond more quickly and accurately measure the gas concentration. A light source generator and a light source receiver for the long optical path are respectively installed in the light-generating opening A and the light-receiving opening A to detect low-concentration gas. Because the long optical path has a longer optical path, it can more sensitively capture the absorption signal of low-concentration methane gas, thereby achieving accurate measurement of low-concentration gas.

[0012] Furthermore, during methane gas detection, the two optical paths read their respective measurement results. By comparing the readings from the two optical paths, the reasonableness of each reading can be verified. If the reading of one optical path is abnormal (such as due to dust accumulation on the receiver or abnormal reflection), it can be corrected using the reading from the other optical path, thereby ensuring the accuracy of the measurement results. This approach solves the technical problems of weak anti-interference capability and insufficient measurement accuracy and stability caused by the single optical path design in existing optical absorption methane detectors. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a front view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0015] Figure 2 This is a rear view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0016] Figure 3 This is a top view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0017] Figure 4 This is a bottom view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0018] Figure 5 This is a left view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0019] Figure 6 This is a right view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0020] 101-Main body, 102-Gas chamber, 103-Mounting cavity, 104-Optical path generating opening A, 105-Optical path receiving opening A, 106-Optical path generating opening B, 107-Optical path receiving opening B, 108-Gas outlet, 109-First groove, 110-Second groove. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] Please see Figures 1-6 ,in Figure 1 This is a front view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model. Figure 2 This is a rear view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model. Figure 3 This is a top view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model. Figure 4 This is a bottom view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model. Figure 5 This is a left view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model. Figure 6 This is a right view of the dual-optical-path self-calibrating absorption spectroscopy methane detector of this utility model.

[0023] This utility model provides a dual-optical-path self-calibrated absorption spectrum methane detector, including a main body 101, a gas chamber 102, a gas outlet unit, and a mounting cavity 103. The gas chamber 102 is disposed on the main body 101, and the gas outlet unit is also mounted on the main body 101 and communicates with the gas chamber 102. The mounting cavity 103 is disposed on the side of the main body 101 away from the gas chamber 102, and a circuit board is installed inside the mounting cavity 103.

[0024] A breathable membrane is installed on the surface of the main body 101 where the gas chamber 102 is formed;

[0025] The main body 101 is also provided with an optical path generating opening A 104, an optical path receiving opening A 105, an optical path generating opening B 106, and an optical path receiving opening B 107. The optical path generating opening A 104 and the optical path receiving opening B 105 are symmetrically arranged, as are the optical path generating opening B 106 and the optical path receiving opening B 107. A light source generator and a light source receiver are respectively installed in the optical path generating opening A 104 and the optical path receiving opening A 105, and similarly, a light source generator and a light source receiver are respectively installed in the optical path generating opening B 106 and the optical path receiving opening B 107.

[0026] The optical path generating opening B 106 and the optical path receiving opening B 107 are located below the optical path generating opening A 104 and the optical path receiving opening A 105.

[0027] In this specific embodiment, during actual use, the light path generating opening A 104 and the light path receiving opening A 105 are used for the long optical path, while the light path generating opening B 106 and the light path receiving opening B 107 are used for the short optical path. Gas enters the gas chamber 102 through the permeable membrane. At this time, a light source generator and a light source receiver for the short optical path are respectively installed in the light path generating opening B 106 and the light path receiving opening B 107 to cooperate in detecting high-concentration gas. When the methane gas concentration is high, the short optical path can respond more quickly and accurately measure the gas concentration. A light source generator and a light source receiver for the long optical path are respectively installed in the light path generating opening A 104 and the light path receiving opening A 105 to cooperate in detecting low-concentration gas. Because the long optical path has a longer optical path, it can more sensitively capture the absorption signal of low-concentration methane gas, thereby achieving accurate measurement of low-concentration gas.

[0028] Furthermore, during methane gas detection, the two optical paths read their respective measurement results. By comparing the readings from the two optical paths, the reasonableness of each reading can be verified. If the reading of one optical path is abnormal (such as due to dust accumulation on the receiver or abnormal reflection), it can be corrected using the reading from the other optical path, thereby ensuring the accuracy of the measurement results. This approach solves the technical problems of weak anti-interference capability and insufficient measurement accuracy and stability caused by the single optical path design in existing optical absorption methane detectors.

[0029] The air outlet unit includes multiple air outlets 108, all of which are disposed on the main body 101.

[0030] In this specific embodiment, because methane gas has a low specific gravity, it floats in the air. Therefore, multiple gas outlets 108 are provided above the gas chamber 102 to effectively remove the methane gas accumulated in the gas chamber 102 and prevent it from interfering with the measurement results. This design helps to improve the accuracy of continuous measurements.

[0031] Secondly, the dual-optical-path self-calibrating absorption spectroscopy methane detector further includes two first grooves 109 and two second grooves 110. The two first grooves 109 are respectively connected to the optical path generating opening A 104 and the optical path receiving opening A 105, and the two second grooves 110 are respectively connected to the optical path generating opening B 106 and the optical path receiving opening B 107.

[0032] In this specific embodiment, the two first grooves 109 are respectively used for circuit planning when installing the light source generator and the light source receiver, and the two second grooves 110 are respectively used for circuit planning when installing the light source generator and the light source receiver.

[0033] Using a dual-path self-calibrating absorption spectroscopy methane detector according to this embodiment, in specific use, the light path generating opening A 104 and the light path receiving opening A 105 are used for the long light path, and the light path generating opening B 106 and the light path receiving opening B 107 are used for the short light path. Gas enters the gas chamber 102 through a permeable membrane. At this time, a light source generator and a light source receiver for the short light path are respectively installed in the light path generating opening B 106 and the light path receiving opening B 107 to cooperate in detecting high-concentration gas. When the methane gas concentration is high, the short light path can respond more quickly and accurately measure the gas concentration. A light source generator and a light source receiver for the long light path are respectively installed in the light path generating opening A 104 and the light path receiving opening A 105 to cooperate in detecting low-concentration gas. Because the long light path has a longer optical path, it can more sensitively capture the absorption signal of low-concentration methane gas, thereby achieving accurate measurement of low-concentration gas.

[0034] Furthermore, during methane gas detection, the two optical paths read their respective measurement results. By comparing the readings from the two optical paths, the reasonableness of each reading can be verified. If the reading of one optical path is abnormal (such as due to dust accumulation on the receiver or abnormal reflection), it can be corrected using the reading from the other optical path, thereby ensuring the accuracy of the measurement results. This approach solves the technical problems of weak anti-interference capability and insufficient measurement accuracy and stability caused by the single optical path design in existing optical absorption methane detectors.

[0035] Specifically, during actual measurements, each optical path is first illuminated at full power using short pulses. This ensures the accuracy and stability of the measurement while reducing energy consumption and interference.

[0036] The irradiation power is controlled by a circuit board, which allows the irradiation power to be adjusted according to actual conditions to adapt to different measurement needs and environmental conditions.

[0037] After illumination, the circuit board reads data from the light source receiver (PD) and compares it with the original production measurement data. A baseline comparison value is obtained, which will serve as the basis for comparison in subsequent measurements.

[0038] By comparing data, the accuracy and consistency of measurement results are evaluated, thereby ensuring the reliability of the measurement results.

[0039] The circuit board is equipped with a self-calibration mechanism. In subsequent measurements, the circuit board uses the previously obtained baseline comparison value as a basis to correct the measurement results. If the measurement results differ significantly from the baseline comparison value, it may indicate the presence of optical path interference or a fault.

[0040] In this way, the circuit board can automatically identify and eliminate possible optical path interference and faults, thereby improving the accuracy and stability of the measurement.

[0041] If the initial calibration fails to reach a specified range of the original data, the circuit board will issue an alarm signal, indicating the presence of optical path interference or a malfunction. This allows for timely detection of problems and the implementation of appropriate corrective measures, avoiding errors and uncertainties in the measurement results.

[0042] Continuous calibration and adjustment are performed during long-term measurements. This eliminates the influence of residual gases, ensuring the accuracy and consistency of the measurement results.

[0043] At the same time, this long-term measurement correction also helps to promptly detect and handle unknown faults and occasional optical path interference (such as accidents involving a large amount of water vapor in a short period of time), thereby improving the reliability and stability of the measurement.

[0044] Compared to traditional single-optical-path methane detectors, this invention employs two optical paths (a long optical path and a short optical path) as the source of absorption detection, thereby improving the accuracy and stability of the measurement and effectively addressing the impact of uncertainties such as receiver dust on the measurement results.

[0045] The optical path employs an optical path generating opening B 106 and an optical path receiving opening B 107, with a light source generator and a light source receiver for a short optical path respectively installed within the optical path generating opening B 106 and the optical path receiving opening B 107. This is primarily used for the detection of high-concentration gases. When the methane gas concentration is high, the short optical path allows for a faster response and more accurate measurement of the gas concentration.

[0046] The optical path employs an optical generation opening A 104 and an optical path receiving opening A 105, with a light source generator and a light source receiver for a long optical path respectively installed within the optical path generation opening A 104 and the optical path receiving opening A 105, for detecting low-concentration gases. Because the long optical path has a longer optical path, it can more sensitively capture the absorption signal of low-concentration methane gas, thereby achieving accurate measurement of low-concentration gases.

[0047] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A dual-optical-path self-calibrating absorption spectroscopy methane detector, characterized in that, The device includes a main body, a gas chamber, an exhaust unit, and a mounting cavity. The gas chamber is disposed on the main body, and the exhaust unit is also mounted on the main body and communicates with the gas chamber. The mounting cavity is disposed on the side of the main body away from the gas chamber, and a circuit board is mounted in the mounting cavity. A breathable membrane is installed on the surface of the main body where the gas chamber is formed; The main body is also provided with an optical path generating opening A, an optical path receiving opening A, an optical path generating opening B, and an optical path receiving opening B. The optical path generating opening A and the optical path receiving opening B are symmetrically arranged. A light source generator and a light source receiver are respectively installed in the optical path generating opening A and the optical path receiving opening A. Similarly, a light source generator and a light source receiver are respectively installed in the optical path generating opening B and the optical path receiving opening B.

2. The dual-optical-path self-calibrating absorption spectroscopy methane detector as described in claim 1, characterized in that, The optical path generating opening B and the optical path receiving opening B are located below the optical path generating opening A and the optical path receiving opening A.

3. The dual-optical-path self-calibrating absorption spectroscopy methane detector as described in claim 1, characterized in that, The air outlet unit includes multiple air outlets, all of which are disposed on the main body.

4. The dual-optical-path self-calibrating absorption spectroscopy methane detector as described in claim 3, characterized in that, The dual-path self-calibrating absorption spectroscopy methane detector further includes two first grooves and two second grooves. The two first grooves are respectively connected to the light path generating opening A and the light path receiving opening A, and the two second grooves are respectively connected to the light path generating opening B and the light path receiving opening B.

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