Batch aging calibration device for laser gas sensor

Abstract

The utility model relates to a batch aging calibration device for laser gas sensors. The device comprises a sealed box body, an inner cavity of the sealed box body forms a detection air chamber, and the sealed box body is provided with an air inlet and an air outlet which are communicated with the detection air chamber. The sealing box body is provided with a plurality of detection ports communicated with the detection gas chamber, each detection port is provided with a first mounting structure for mounting a gas sensor to be calibrated in a sealing manner, and the sealing box body is provided with at least one mounting port for mounting a standard gas sensor; and each mounting port is provided with a second mounting structure for sealing and mounting a standard gas sensor. The calibration device further comprises a data acquisition board which is used for being connected with each standard gas sensor and each to-be-calibrated gas sensor. Standard gas is uniformly provided for the detection gas chamber through the gas inlet, a plurality of gas sensors can be calibrated and detected at a time, and compared with the prior art, the calibration and detection efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor calibration and detection, and in particular to a batch aging calibration device for laser gas sensors. Background Art

[0002] Laser methane sensors use the tunable semiconductor laser absorption spectroscopy (TDLAS) technology to detect methane gas concentration. It is an optical and spectroscopic technology that applies lasers to gas analysis absorption spectrum measurement. It is also a gas analysis detection method that adjusts the line width and wavelength of the tunable semiconductor laser by changing the current and temperature injected by the laser, and then measures the absorption line of the gas molecules, and finally calculates the measured gas concentration through the Lambert-Beer law. After years of development, TDLAS technology has become increasingly mature and has the advantages of high sensitivity, a wide range of detectable gases, and real-time online monitoring. Therefore, laser gas sensors based on TDLAS technology overcome the shortcomings of existing gas sensors on the market, making them a dominant force in the field of gas detection, including mine chemicals, gas valve wells, and environmental testing.

[0003] However, as the sensor is used for a longer time, the gas sensor ages and the detection results will have some deviations. For example, there is a problem of poor consistency between the laser and the light intensity of the debugging optical path in the laser methane sensor. Therefore, it is necessary to recalibrate and test these gas sensors after they have been used for a certain period of time. The existing calibration and testing are all manual operations, and the process is cumbersome and complicated, resulting in low efficiency in the calibration and testing of laser methane sensors, so it is impossible to achieve large-scale automatic calibration and testing. Utility Model Content

[0004] The utility model aims to provide a batch aging calibration device for laser gas sensors to solve the problem in the prior art that laser gas sensors cannot be calibrated and tested in batches, resulting in low calibration and testing efficiency.

[0005] To achieve the above-mentioned purpose, a laser gas sensor batch aging calibration device of the utility model adopts the following technical scheme: a laser gas sensor batch aging calibration device, comprising a sealed box body, the inner cavity of the sealed box body forms a detection air chamber, the sealed box body has an air inlet and an air outlet connected to the detection air chamber, the sealed box body is provided with a plurality of detection ports connected to the detection air chamber, each detection port is provided with a first mounting structure for sealing and installing the gas sensor to be calibrated, at least one mounting port is installed on the sealed box body for installing a standard gas sensor, and each mounting port is provided with a second mounting structure for sealing and installing the standard gas sensor; the calibration device also includes a data acquisition board for connecting with each standard gas sensor and each gas sensor to be calibrated.

[0006] The first mounting structure comprises a connecting nut arranged on the sealing box body, and is used for connecting the threaded ends of the gas sensors to be calibrated together.

[0007] The first mounting structure further comprises a sealing gasket for sealingly cooperating with an end face of a threaded end of the gas sensor to be calibrated.

[0008] The second mounting structure includes a fixing rod fixedly connected to the sealing box body, and a limiting fixing plate for limiting and fixing the standard gas sensor is arranged at the upper end of the fixing rod, and the limiting fixing plate is connected to the fixing rod by screws.

[0009] A fan is arranged in the detection air chamber.

[0010] The detection chamber is provided with a temperature-pressure-humidity acquisition board, which is connected to the data acquisition board; the detection chamber is provided with or the temperature-pressure-humidity acquisition board is integrated with a temperature sensor, a pressure sensor and a humidity sensor.

[0011] The sealed box body comprises an upper pressing plate, a middle lining plate and a lower box body which are arranged in sequence from top to bottom, and the detection port and the installation port are both arranged on the middle lining plate and the upper pressing plate.

[0012] The air outlet is connected to an air outlet pipe, and a pressure regulating device is arranged on the air outlet pipe.

[0013] The air inlet is connected to an air inlet pipe, which is a coil structure for heat exchange with the external environment.

[0014] The calibration device also includes a mounting plate, the sealing box body is arranged on the mounting plate, and a handle is arranged on the mounting plate.

[0015] The beneficial effects of the utility model are as follows: the gas sensor to be calibrated is sealed and installed through the first installation structure, the standard gas sensor is sealed and installed through the second installation structure, and the detection gas chamber is uniformly provided with standard gas by the air inlet. Multiple gas sensors can be calibrated and tested at one time, which greatly improves the efficiency of calibration and testing compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of a batch aging calibration device for laser gas sensors of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the internal structure;

[0018] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0019] Figure 4 yes Figure 1 Schematic diagram of the internal structure of the sealed box. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] An embodiment of a batch aging calibration device for laser gas sensors of the utility model is as follows: Figure 1-Figure 4 As shown, it includes a mounting plate 1, a sealed box 2 and a data acquisition board 12 are arranged on the mounting plate, and a handle is arranged on the mounting plate to facilitate the movement of the entire device. Specifically, there are two handles, which are arranged on the left and right sides of the mounting plate respectively. Four legs are arranged below the mounting plate, correspondingly arranged at the four corners of the mounting plate, so as to facilitate the stable placement of the entire device.

[0023] The inner cavity of the sealed box 2 forms a detection air chamber 13. The sealed box has an air inlet 3 and an air outlet 4 connected to the detection air chamber. The air outlet is connected to an air outlet pipe. A pressure regulating device is provided on the air outlet pipe. The pressure regulating device can be a pressure regulating valve or other devices, so that the sensor can be compensated for air pressure. The air inlet is connected to an air inlet pipe 5. The air inlet pipe is a coil structure for heat exchange with the external environment. The gas output from the gas cylinder storing the standard gas is pretreated so that the gas output from the gas cylinder is consistent with the ambient temperature, thereby reducing the temperature compensation error. The coil has a standard gas inlet. In this embodiment, the coil adopts a copper tube with good thermal conductivity, one end of which is connected to the gas cylinder of the standard gas and the other end is connected to the detection air chamber. In order to effectively preheat the gas, a copper tube with a smaller diameter is specially selected. The total length of the coil is greater than 10m. The whole coil is placed in the space below the data acquisition board, so that the gas can travel inside the slender copper tube and exchange heat with the ambient temperature through the copper tube wall, so that the temperature of the gas entering the air chamber is close to the ambient temperature, thereby reducing the temperature compensation error.

[0024] The sealed box body is provided with a plurality of detection ports 17 connected to the detection gas chamber. In this embodiment, the number of the detection ports is 6. A first mounting structure for sealing and installing the gas sensor 7 to be calibrated is provided at each detection port. In this embodiment, the first mounting structure includes a connecting nut 19 provided on the sealed box body, which is used to connect the threaded ends of the gas sensor to be calibrated together. The first mounting structure also includes a sealing gasket 20 for sealing with the end face of the threaded end of the gas sensor to be calibrated, which is used to seal the sensor to be calibrated after tightening. At least one mounting port 18 is installed on the sealed box body for installing the standard gas sensor, and a second mounting structure is provided at each mounting port for sealing and installing the standard gas sensor 8. In this embodiment, the number of the mounting ports is two, and they are respectively arranged at the two diagonal positions of the sealed box body. The second mounting structure includes a fixing rod 10 fixedly connected to the sealed box body, and a limiting fixing plate 11 for limiting and fixing the standard gas sensor is provided at the upper end of the fixing rod, and the limiting fixing plate is connected to the fixing rod by screws.

[0025] In this embodiment, the data acquisition board is installed on the mounting plate through an insulating column, the coil is located below the data acquisition board, and each standard gas sensor and each gas sensor to be calibrated are connected to the data acquisition board through a cable for data transmission and power supply. In order to make the standard gas in the detection chamber more evenly mixed, a fan 22 is provided in the detection chamber 13. In this embodiment, the number of fans is two and they are respectively arranged at the two diagonal positions of the detection chamber, which can accelerate the rapid flow of gas inside the chamber. In order to be able to monitor the temperature, humidity and gas pressure inside the chamber in real time, a temperature-pressure-humidity acquisition board 21 is also provided in the detection chamber. The temperature-pressure-humidity acquisition board is connected to the data acquisition board, and a temperature sensor, a pressure sensor and a humidity sensor are integrated on the temperature-pressure-humidity acquisition board. In this embodiment, the number of temperature-pressure-humidity acquisition boards is also two, which are respectively arranged at the two diagonal positions of the detection chamber. In this embodiment, the sealed box body includes an upper pressure plate 16, a middle lining plate 15 and a lower box body 14 arranged from top to bottom, the detection port and the installation port are both arranged on the middle lining plate and the upper pressure plate, and the air inlet and the air outlet are arranged on the lower box body.

[0026] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

[0027] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0028] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0029] In other embodiments of the utility model, the number of mounting ports can be adjusted according to actual needs, for example, 2, 3, etc.; the number of mounting ports can also be adjusted according to actual needs, for example, 1 or 3, etc.; the number of fans can also be adjusted according to actual needs, for example, 1; the number of temperature-pressure-humidity collection boards can also be adjusted according to actual needs, for example, 1.

Claims

1. A laser gas sensor batch aging calibration device, characterized by: The calibration device comprises a sealed box body, the inner cavity of which forms a detection air chamber, the sealed box body having an air inlet and an air outlet connected to the detection air chamber, a plurality of detection ports connected to the detection air chamber are arranged on the sealed box body, each detection port is provided with a first mounting structure for sealing and mounting a gas sensor to be calibrated, at least one mounting port is installed on the sealed box body for mounting a standard gas sensor, and each mounting port is provided with a second mounting structure for sealing and mounting a standard gas sensor; the calibration device also comprises a data acquisition board for connecting with each standard gas sensor and each gas sensor to be calibrated.

2. The laser gas sensor batch aging calibration device according to claim 1 is characterized in that: The first mounting structure comprises a connecting nut arranged on the sealing box body, and is used for connecting the threaded ends of the gas sensors to be calibrated together.

3. The laser gas sensor batch aging calibration device according to claim 2 is characterized in that: The first mounting structure further comprises a sealing gasket for sealingly cooperating with an end face of a threaded end of the gas sensor to be calibrated.

4. The laser gas sensor batch aging calibration device according to claim 1 is characterized in that: The second mounting structure includes a fixing rod fixedly connected to the sealing box body, and a limiting fixing plate for limiting and fixing the standard gas sensor is arranged at the upper end of the fixing rod, and the limiting fixing plate is connected to the fixing rod by screws.

5. The laser gas sensor batch aging calibration device according to claim 1 is characterized in that: A fan is arranged in the detection air chamber.

6. The laser gas sensor batch aging calibration device according to claim 1 is characterized by: The detection chamber is provided with a temperature-pressure-humidity acquisition board, which is connected to the data acquisition board; the detection chamber is provided with or the temperature-pressure-humidity acquisition board is integrated with a temperature sensor, a pressure sensor and a humidity sensor.

7. The laser gas sensor batch aging calibration device according to claim 1 is characterized by: The sealed box body comprises an upper pressing plate, a middle lining plate and a lower box body which are arranged in sequence from top to bottom, and the detection port and the installation port are both arranged on the middle lining plate and the upper pressing plate.

8. The laser gas sensor batch aging calibration device according to any one of claims 1 to 7, characterized in that: The air outlet is connected to an air outlet pipe, and a pressure regulating device is arranged on the air outlet pipe.

9. The laser gas sensor batch aging calibration device according to any one of claims 1 to 7, characterized in that: The air inlet is connected to an air inlet pipe, which is a coil structure for heat exchange with the external environment.

10. The laser gas sensor batch aging calibration device according to claim 1, characterized in that: The calibration device also includes a mounting plate, the sealing box body is arranged on the mounting plate, and a handle is arranged on the mounting plate.

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