Optical interference gas sensor pressure method data calibration device

Abstract

The utility model belongs to the technical field of gas concentration measurement, and discloses a data calibration device focused on a light interference type gas concentration detection sensor. The utility model aims to provide the pressure method calibration device which does not need a standard gas sample, and is simple and convenient to operate, low in cost and high in precision. The device is composed of a pressure pump, a pressure gauge, a pressure regulating handle, a light interference gas sensor, an acquisition host and a gas pressure stabilizer. The air pressure difference between the sampling air chamber and the standard air chamber is adjusted through the pressure pump, the air pressure stabilizer stabilizes air pressure, and the acquisition host records and processes data. The air pressure stabilizer adopts the design of a buffer cavity and a pressure stabilizing valve, the calibration device supports multiple channels, and the acquisition host can realize automatic control and data visualization. The device is simple to operate, does not need to prepare a standard gas sample, and reduces cost; the air pressure stabilizer and the pressure regulating handle guarantee the precision; the efficiency is improved through multi-channel and automatic calibration; dangerous gas is prevented from being used, and the safety is high; the device is suitable for various gas sensors, is environment-friendly, simulates the gas concentration change through the gas pressure difference, and has a wide application prospect.

Description

Technical Field

[0001] This utility model belongs to the field of gas concentration measurement technology, and in particular, it relates to a data calibration device for pressure method of optical interferometry gas sensor. Background Technology

[0002] As the core component of gas detectors, the sensitivity and accuracy of gas sensors directly determine the reliability of detection results. In practical use, sensors are susceptible to various factors such as contamination, aging, and changes in environmental conditions, leading to performance degradation and measurement deviations. Therefore, regular calibration of gas sensors is crucial to ensuring long-term stable operation and accurate detection. Currently, standard gas sample calibration is the most commonly used calibration method in the production and use of gas sensors. A standard gas sample is a gas with known composition and concentration, possessing accuracy and repeatability. Calibrating gas sensors using standard gas samples provides an accurate reference point. By comparing the standard gas sample with actual measurement results, deviations can be promptly identified and corrected, keeping measurement accuracy within the specified range and providing solid technical support for safe production.

[0003] However, the standard gas sample calibration method also has some obvious drawbacks. During calibration, it is usually necessary to prepare standard gas samples with known composition and concentration, and special care must be taken to separate the instrument from the pressurized gas source promptly after sampling, making the process relatively cumbersome. Furthermore, standard gas samples may be contaminated or leaked during preparation, storage, and transportation, which affects their accuracy and stability. Optical interferometry gas sensors are based on a comparative measurement principle. The refractive index difference between the gas sample chamber and the air chamber in the gas chamber assembly due to pressure differences corresponds one-to-one with the refractive index difference between the two chambers due to different gas types. This principle makes it possible to calibrate optical interferometry methane detectors using pressure, with high accuracy. Therefore, automatic calibration devices based on pressure calibration have become an important means to improve the efficiency and accuracy of sensor calibration, effectively avoiding many inconveniences and impacts associated with the gas sample method. Utility Model Content

[0004] This invention provides a data calibration device for a pressure method of an optical interferometric gas sensor, comprising a pressure pump 1, a pressure gauge 3, a pressure regulating handle 2, an optical interferometric gas sensor 5, a data acquisition host 6, and a pressure stabilizer 4. The pressure pump 1 is connected to the sampling chamber 5.2 and the standard chamber 5.3 of the optical interferometric gas sensor 5 via pipelines. The pressure gauge 3 is used to monitor the gas pressure of the sampling chamber 5.2 in real time. The pressure regulating handle 2 is used to precisely adjust the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3. The pressure stabilizer 4 is used to maintain stable gas pressure. The data acquisition host 6 is used to record and process the data of the optical interferometric gas sensor 5.

[0005] Furthermore, the pressure stabilizer 4 adopts a design with a buffer chamber 4.4 and a pressure regulating valve 4.2. The buffer chamber 4.4 is used to buffer pressure fluctuations, and the pressure regulating valve 4.2 is located between the buffer chamber 4.4 and the outlet 4.5. It automatically adjusts the opening according to the pressure change in the buffer chamber 4.4 to ensure the pressure at the outlet 4.5 is stable. This ensures that the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3 remains stable during the adjustment process, reducing the impact of fluctuations on calibration accuracy.

[0006] Furthermore, the calibration device adopts a multi-channel design, which can support the simultaneous calibration of multiple sets of optical interference gas sensors 5, thereby improving calibration efficiency.

[0007] Furthermore, the data acquisition host 6 integrates an automated control module, which can automatically adjust the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3 according to a preset program and record the data, reducing manual operation.

[0008] Furthermore, the data acquisition host 6 is equipped with a display screen and data analysis software. The display screen can show the calibration curve and results in real time, and the data analysis software is used to analyze the acquired data, realize data visualization, and facilitate user analysis and judgment.

[0009] Furthermore, the output end of the pressure pump 1 is connected to the input end of the pressure regulating handle 2 through a pressure pipe, and the pressure gauge 3 is connected to the air inlet pipe of the sampling air chamber 5.2 through the air pressure stabilizer 4 to monitor the air pressure value of the sampling air chamber 5.2 in real time and ensure the accuracy of air pressure monitoring.

[0010] Furthermore, the pressure regulating handle 2 is installed on the pipeline between the pressure pump 1 and the sampling gas chamber 5.2. By rotating the pressure regulating handle 2, the air pressure of the sampling gas chamber 5.2 can be finely adjusted, thereby changing the air pressure difference between the sampling gas chamber 5.2 and the standard gas chamber 5.3. The standard gas chamber 5.3 has the same pressure as the external atmospheric environment.

[0011] Furthermore, the pressure stabilizer 4 is installed on the pipe between the pressure regulating handle 2 and the sampling gas chamber 5.2. The air inlet 4.1 of the pressure stabilizer 4 is connected to the pressure regulating handle 2 through the pipe and the pressure gauge 3 to receive gas from the pressure pump 1. The air outlet 4.5 of the pressure stabilizer 4 is connected to the sampling gas chamber 5.2 of the optical interference gas sensor 5 through the pipe to provide stable air pressure to the sampling gas chamber 5.2.

[0012] Furthermore, a pressure feedback module 4.3 is installed in the buffer chamber 4.4 of the air pressure stabilizer 4. The pressure feedback module 4.3 is connected to the pressure regulating valve 4.2 via a signal line to monitor the air pressure in the buffer chamber 4.4 in real time and automatically adjust the opening of the pressure regulating valve 4.2 according to the air pressure change.

[0013] Beneficial effects:

[0014] Easy to operate: No standard gas sample preparation is required, reducing operational steps; Low cost: Saves on gas sample purchase and management costs; High accuracy: Pressure stabilizer and fine-tuning handle ensure precise and controllable pressure difference; High efficiency: Supports multi-channel and automated calibration, significantly improving calibration efficiency; High safety: Avoids the use of toxic or flammable gases, reducing safety risks; Wide applicability: Suitable for various gas sensors, no need to change gas samples; Environmentally friendly: Reduces gas sample usage and emissions, lowering environmental impact. Attached image description:

[0015] Figure 1 This is a schematic diagram of the structure of a pressure-based data calibration device for an optical interferometer gas sensor.

[0016] Figure 2 This is a schematic diagram of the air pressure stabilizer in the calibration device.

[0017] The components include: 1. Pressure pump; 2. Pressure regulating handle; 3. Pressure gauge; 4. Pressure stabilizer; 5. Sensor; 6. Data acquisition host; 5. Optical path; 5.1. Sampling chamber; 5.2. Standard chamber; 5.3. Signal acquisition device; 5.4. Atmospheric outlet; 5.5. Inlet; 4.1. Pressure regulating valve; 4.2. Pressure feedback module; 4.3. Buffer chamber; 4.4. Outlet. Detailed implementation method:

[0018] Example 1:

[0019] A pressure-based data calibration device for an optical interferometric gas sensor includes a pressure pump 1, a pressure gauge 3, a pressure regulating handle 2, an optical interferometric gas sensor 5, a data acquisition unit 6, and a pressure stabilizer 4. The pressure pump 1 is connected via pipes to the sampling chamber 5.2 and the standard chamber 5.3 of the optical interferometric gas sensor 5. The pressure gauge 3 is used to monitor the gas pressure in the sampling chamber 5.2 in real time. The pressure regulating handle 2 is used to precisely adjust the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3. The pressure stabilizer 4 is used to maintain stable gas pressure. The data acquisition unit 6 is used to record and process the data from the optical interferometric gas sensor 5. The pressure stabilizer 4 employs a buffer chamber 4.4 and a pressure regulating valve 4.2. The buffer chamber 4.4 buffers pressure fluctuations, and the pressure regulating valve 4.2 is located between the buffer chamber 4.4 and the outlet 4.5. The valve automatically adjusts its opening based on pressure changes within the buffer chamber 4.4 to ensure stable pressure at the outlet 4.5, thereby ensuring that the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3 remains stable during adjustment, reducing the impact of fluctuations on calibration accuracy. The calibration device employs a multi-channel design, enabling simultaneous calibration of multiple sets of optical interferometric gas sensors 5 to improve calibration efficiency. The data acquisition host 6 integrates an automated control module, which automatically adjusts the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3 according to a preset program and records the data, reducing manual operation. The data acquisition host 6 is equipped with a display screen and data analysis software. The display screen shows the calibration curve and results in real time, while the data analysis software analyzes the acquired data, enabling data visualization and facilitating user analysis and judgment. The output of the pressure pump 1 is connected to the input of the pressure regulating handle 2 via a pressure pipeline. The pressure gauge 3 is connected to the inlet pipe of the sampling chamber 5.2 via a pressure stabilizer 4 to monitor the pressure value of the sampling chamber 5.2 in real time, ensuring the accuracy of pressure monitoring. The pressure regulating handle 2 is installed on the pipeline between the pressure pump 1 and the sampling chamber 5.2. By rotating the pressure regulating handle 2, the pressure of the sampling chamber 5.2 can be finely adjusted, thereby changing the pressure difference between the sampling chamber 5.2 and the standard chamber 5.3. The pressure of the standard chamber 5.3 is the same as that of the external atmospheric environment. A pressure stabilizer 4 is installed on the pipe between the pressure regulating handle 2 and the sampling gas chamber 5.2. The inlet 4.1 of the pressure stabilizer 4 is connected to the pressure regulating handle 2 via a pipe and a pressure gauge 3, receiving gas from the pressure pump 1. The outlet 4.5 of the pressure stabilizer 4 is connected to the sampling gas chamber 5.2 of the optical interference gas sensor 5 via a pipe, providing stable air pressure to the sampling gas chamber 5.2. A pressure feedback module 4.3 is installed in the buffer chamber 4.4 of the pressure stabilizer 4. The pressure feedback module 4.3 is connected to the pressure regulating valve 4.2 via a signal line, monitoring the air pressure in the buffer chamber 4.4 in real time and automatically adjusting the opening of the pressure regulating valve 4.2 according to air pressure changes. The air pressure source generated by the pressure pump 1 is connected to the sampling gas chamber 5.2 of the optical interference gas sensor via a pipe assembly. The standard gas chamber 5.3 is open to the external atmosphere. The output end of the pressure pump 1 is connected to the input end of the pressure regulating handle 2 via a pressure pipe.Pressure gauge 3 is connected to the inlet pipe of sampling chamber 5.2 via pressure stabilizer 4 to monitor the air pressure value of the sampling chamber in real time and ensure the accuracy of air pressure monitoring. Pressure regulating handle 2 is installed on the pipe between pressure pump 1 and sampling chamber 5.2 to precisely adjust the air pressure of the sampling chamber. By rotating pressure regulating handle 2, the air pressure of the sampling chamber can be finely adjusted, thereby changing the air pressure difference between the sampling chamber and the standard chamber (the standard chamber has the same pressure as the external atmosphere). Pressure stabilizer 4 is installed on the pipe between pressure regulating handle 2 and sampling chamber 5.2 to stabilize the air pressure difference and reduce air pressure fluctuations. Pressure stabilizer 4 includes a buffer chamber 4.4 and a pressure regulating valve 4.2 to ensure that the air pressure difference stabilizes quickly after adjustment. Optical interference gas sensor 5 includes sampling chamber 5.2 and standard chamber 5.3, which are connected to the air pressure source and the external atmosphere via pipes, respectively. The air pressure difference between sampling chamber 5.2 and standard chamber 5.3 is measured by the movement of optical interference fringes, thus reflecting changes in gas concentration. The data acquisition host 6 can be connected to multiple optical interferometric gas sensors 5 via a data communication bus for recording and processing sensor data. The data acquisition host 6 is equipped with a display screen and data analysis software, which can display calibration curves and results in real time.

[0020] Figure 2 This is a schematic diagram of the air pressure stabilizer in the pressure calibration device of this utility model, showing the connection relationship and working principle of the internal components of the air pressure stabilizer. The air inlet 4.1 is connected to the pressure regulating handle 2 via a pipe and pressure gauge 3, receiving gas from the pressure pump 1. The air pressure at the air inlet 4.1 is regulated by the pressure regulating handle 2. The buffer chamber 4.4 is the core component of the air pressure stabilizer 4, used to buffer air pressure fluctuations. The buffer chamber 4.4 is connected to the air inlet 4.1 via a pipe; after gas enters the buffer chamber 4.4, air pressure fluctuations are effectively reduced. The pressure regulating valve 4.2 is located between the buffer chamber 4.4 and the air outlet 4.5, used to further stabilize the air pressure. The pressure regulating valve 4.2 automatically adjusts its opening according to the air pressure changes in the buffer chamber 4.4, ensuring stable air pressure at the air outlet 4.5. The air outlet 4.5 is connected to the sampling chamber 5.2 of the optical interference gas sensor via a pipe, providing stable air pressure to the sampling chamber. The air pressure at the air inlet 4.1 is monitored by pressure gauge 3 to ensure precise and controllable pressure difference with the standard air chamber. A pressure feedback module 4.3 is installed inside the buffer chamber 4.4 to monitor the air pressure within the buffer chamber in real time. The pressure feedback module 4.3 is connected to the pressure regulating valve 4.2 via a signal line, automatically adjusting the valve's opening based on pressure changes.

[0021] Calibration Procedure: Device Assembly: Assemble the pressure pump, pressure gauge, pressure regulating handle, pressure stabilizer, optical interferometer gas sensor, and data acquisition unit according to... Figure 1Connection. Start the pressure pump: Supply air to the sampling chamber and standard chamber, with the initial pressure set to 1 atmosphere. Adjust the pressure difference: Gradually adjust the pressure in the sampling chamber using the pressure regulating handle (e.g., 1.01, 1.02, 1.03 atmospheres), while maintaining the standard chamber at 1 atmosphere in equilibrium with the external atmosphere. Stabilize the pressure: After adjustment, the pressure stabilizer quickly stabilizes the pressure difference to ensure calibration accuracy. Record data: The acquisition unit records the optical interference fringe movement data in real time and generates a calibration curve. Repeat the operation: Change the pressure difference and repeat steps 3-5 to complete multi-point calibration. Data analysis: The acquisition unit automatically analyzes the data, generates a calibration report, and displays the calibration results and error range.

Claims

1. A pressure-based data calibration device for an optical interferometric gas sensor, characterized in that, The system includes a pressure pump (1), a pressure gauge (3), a pressure regulating handle (2), an optical interference gas sensor (5), a data acquisition host (6), and a pressure stabilizer (4). The pressure pump (1) is connected to the sampling chamber (5.2) and the standard chamber (5.3) of the optical interference gas sensor (5) through a pipeline. The pressure gauge (3) is used to monitor the gas pressure of the sampling chamber (5.2) in real time. The pressure regulating handle (2) is used to precisely adjust the pressure difference between the sampling chamber (5.2) and the standard chamber (5.3). The pressure stabilizer (4) is used to maintain stable gas pressure. The data acquisition host (6) is used to record and process the data of the optical interference gas sensor (5).

2. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The pressure stabilizer (4) is designed with a buffer chamber (4.4) and a pressure regulating valve (4.2). The buffer chamber (4.4) is used to buffer pressure fluctuations. The pressure regulating valve (4.2) is located between the buffer chamber (4.4) and the outlet (4.5). It automatically adjusts the opening according to the pressure change in the buffer chamber (4.4) to ensure that the pressure at the outlet (4.5) is stable. This ensures that the pressure difference between the sampling chamber (5.2) and the standard chamber (5.3) remains stable during the adjustment process, reducing the impact of fluctuations on calibration accuracy.

3. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The calibration device adopts a multi-channel design, which can support multiple optical interference gas sensors (5) to be calibrated simultaneously, so as to improve calibration efficiency.

4. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The data acquisition host (6) integrates an automated control module, which can automatically adjust the pressure difference between the sampling chamber (5.2) and the standard chamber (5.3) according to a preset program and record the data, reducing manual operation.

5. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The acquisition host (6) is equipped with a display screen and data analysis software. The display screen can display the calibration curve and results in real time, and the data analysis software is used to analyze the acquired data, realize data visualization, and facilitate user analysis and judgment.

6. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The output end of the pressure pump (1) is connected to the input end of the pressure regulating handle (2) through a pressure pipe. The pressure gauge (3) is connected to the air inlet pipe of the sampling air chamber (5.2) through the air pressure stabilizer (4) to monitor the air pressure value of the sampling air chamber (5.2) in real time and ensure the accuracy of air pressure monitoring.

7. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The pressure regulating handle (2) is installed on the pipeline between the pressure pump (1) and the sampling gas chamber (5.2). By rotating the pressure regulating handle (2), the air pressure of the sampling gas chamber (5.2) can be finely adjusted, thereby changing the air pressure difference between the sampling gas chamber (5.2) and the standard gas chamber (5.3). The standard gas chamber (5.3) has the same pressure as the external atmospheric environment.

8. The optical interferometric gas sensor pressure method data calibration device according to claim 1, characterized in that, The pressure stabilizer (4) is installed on the pipe between the pressure regulating handle (2) and the sampling gas chamber (5.2). The air inlet (4.1) of the pressure stabilizer (4) is connected to the pressure regulating handle (2) through the pipe and the pressure gauge (3) to receive gas from the pressure pump (1). The air outlet (4.5) of the pressure stabilizer (4) is connected to the sampling gas chamber (5.2) of the optical interference gas sensor (5) through the pipe to provide stable air pressure to the sampling gas chamber (5.2).

9. The optical interferometric gas sensor pressure method data calibration device according to claim 2, characterized in that, The pressure stabilizer (4) has a pressure feedback module (4.3) installed in the buffer chamber (4.4). The pressure feedback module (4.3) is connected to the pressure regulating valve (4.2) via a signal line to monitor the air pressure in the buffer chamber (4.4) in real time and automatically adjust the opening of the pressure regulating valve (4.2) according to the air pressure change.

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