A kind of laser gas concentration telemeter measurement detection device, method and detection box

Abstract

The present application relates to the field of calibrating device of gas concentration detection equipment, solve the problem that reliable detection cannot be carried out on the laser gas concentration remote tester in the prior art. A kind of laser gas concentration remote tester metering detection device, method and detection box, including first instrument seat, gas chamber and first reflector, gas chamber is located between first instrument seat and first reflector, gas chamber has closed cavity, the opposite two sides of cavity are transparent material, cavity is communicated with gas inlet and gas outlet. After the gas to be measured enters the gas chamber through the gas inlet, the cavity is closed, the laser gas concentration remote tester is set on the first instrument seat, the laser emitted by the laser gas concentration remote tester is reflected by the first reflector after passing through the gas chamber, and is received by the laser gas concentration remote tester again after passing through the gas chamber. The concentration of specific gas in the gas to be measured in the gas chamber is known, and the accuracy of the laser gas concentration remote tester can be obtained by comparing the reading of the laser gas concentration remote tester.

Description

Technical Field

[0001] This invention relates to the field of calibration devices for gas concentration detection equipment, and more particularly to a laser gas concentration telemetry instrument, calibration method, and calibration box. Background Technology

[0002] A laser gas concentration telemetry device is used to measure the concentration of a specific gas in the air under non-contact conditions. During operation, a laser beam is emitted towards a first reflector. The laser beam passes through the gas to be measured, reaches the first reflector, is reflected, and then passes through the gas again before being received by the laser gas concentration telemetry device. The deflected light reflected from the target is then detected. When the wavelength emitted by the laser is near a specific absorption peak of the gas, temperature control and current modulation are used to control the wavelength to the corresponding absorption peak. A modulation signal consisting of a superimposed sine wave and a triangular wave is then applied to modulate the laser wavelength. Lock-in amplification technology is used to detect the second harmonic signal caused by changes in the concentration of the specific gas, thus achieving the purpose of detecting the concentration of the specific gas. As a gas concentration measurement device, the laser gas concentration telemetry device needs to be calibrated to test its measurement accuracy. In existing technologies, because the gas being measured is often connected to the outside air, the concentration of the specific gas cannot be determined, thus making reliable detection of the laser gas concentration telemetry device impossible. Summary of the Invention

[0003] This invention provides a measurement and detection device, method, and detection box for a laser gas concentration telemetry instrument, which solves the problem in the prior art that the laser gas concentration telemetry instrument cannot reliably detect the gas being measured because the gas being measured is connected to the external air.

[0004] A laser gas concentration telemetry device, method, and detection box include a first instrument base, a gas chamber, and a first reflector. The gas chamber is located between the first instrument base and the first reflector. The gas chamber has a closed cavity with two transparent sides. The cavity is connected to an inlet and an outlet. In use, the gas to be measured enters the gas chamber through the inlet, and the cavity is then sealed. The laser gas concentration telemetry device is mounted on the first instrument base. The laser emitted by the device passes through the gas chamber, is reflected by the first reflector, and then passes through the gas chamber again before being received by the device. The concentration of a specific gas in the gas to be measured within the gas chamber is known. By comparing the reading of the laser gas concentration telemetry device with this concentration, the accuracy of the device can be determined.

[0005] Furthermore, the first instrument base includes a first instrument base body and a first Y-axis slide rail. A Y-axis slider is provided on the first Y-axis slide rail, and the first instrument base body is fixed on the Y-axis slider. The movement of the Y-axis slider along the first Y-axis slide rail can move the optical axis of the laser gas concentration telemeter relative to the gas chamber, adjust the position through which the laser passes, and avoid inaccurate detection due to uneven gas distribution within the gas chamber.

[0006] Furthermore, the gas chamber is mounted on the base and is rotatably connected to the base. By rotating the gas chamber, the length of the laser beam passing through the gas to be measured can be adjusted.

[0007] Furthermore, the cavity is connected to an infrared analyzer via a pipe. Since air is originally present in the gas chamber, the discharge of air through the gas to be tested may cause a change in the concentration of a specific gas in the gas to be tested. The infrared analyzer is used to detect the concentration of the gas to be tested in the gas chamber, which is taken as the actual concentration of the gas to be tested.

[0008] Furthermore, the air chamber includes a first glass plate, a second glass plate, and a side plate, which together form the cavity. The first glass plate and the second glass plate are arranged in parallel, and the air inlet and air outlet are both located on the side plate.

[0009] Furthermore, the air chamber is connected to the base via a turntable, which includes a first disc and a second disc. The first disc and the second disc are rotatably connected, the first disc is fixedly connected to the air chamber, and the second disc is fixedly connected to the base.

[0010] Furthermore, it also includes an X-axis slide rail, on which a first slider is provided, and the first instrument base or the first reflector is disposed on the first slider.

[0011] Furthermore, a second slider is provided on the X-axis slide rail, and the base is disposed on the second slider.

[0012] Furthermore, a third slider is provided on the X-axis slide rail, the first instrument base is disposed on the first slider, and the first reflector is disposed on the third slider.

[0013] Furthermore, the first instrument base body includes a base and a clamp, with connecting pieces at both ends of the clamp. The connecting pieces are detachably connected to the base, and the clamp and the base form a space for accommodating the laser methane telemetry instrument.

[0014] A laser gas concentration remote sensing method, applied to laser gas concentration remote sensing measurement and detection devices, includes the following steps.

[0015] The gas to be tested is introduced into the gas chamber;

[0016] Fix the laser gas concentration telemeter to be measured on the first instrument base, and adjust the positions of the first instrument base, the gas chamber and the first reflector so that the light emitted by the laser gas concentration telemeter passes through the gas chamber and is reflected by the first reflector.

[0017] Depending on the testing requirements, the thickness of the light passing through the gas under test can be adjusted by rotating the gas chamber;

[0018] The concentration of a specific gas in the test gas in the gas chamber is detected by an infrared analyzer.

[0019] A laser gas concentration telemetry meter box includes a box body with a gas inlet and a gas outlet, and a second instrument base and a second reflector plate inside the box body.

[0020] Furthermore, the housing is provided with a second Y-axis slide rail, and the second instrument base and / or the second reflector plate are disposed on the second Y-axis slide rail.

[0021] As can be seen from the above technical solutions, the present invention has the following advantages:

[0022] After the gas to be measured enters the gas chamber through the inlet, the chamber is sealed. The laser gas concentration telemeter is mounted on the first instrument base. The laser emitted by the laser gas concentration telemeter is reflected by the first reflector after passing through the gas chamber, and is received by the laser gas concentration telemeter after passing through the gas chamber again. The concentration of the specific gas in the gas to be measured in the gas chamber is known. By comparing the reading of the laser gas concentration telemeter with this concentration, the accuracy of the laser gas concentration telemeter can be obtained. Attached Figure Description

[0023] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the air chamber structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the first instrument base of the present invention;

[0027] 1. X-axis slide rail, 2. Gas chamber, 3. First reflector, 4. Laser gas concentration telemeter, 5. Base, 6. Clamp, 7. Second slider, 8. Third slider, 9. Air inlet, 10. Air outlet, 11. Pipe connection port, 12. Side plate, 13. Connecting piece. Detailed Implementation

[0028] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this patent.

[0029] Example 1

[0030] like Figure 1-3As shown, a laser gas concentration telemetry device 4 includes a first instrument base, a gas chamber 2, and a first reflector 3. The gas chamber 2 is located between the first instrument base and the first reflector 3. The gas chamber 2 has a closed cavity with two transparent sides. The cavity is connected to an inlet 9 and an outlet 10. Both the inlet and outlet are equipped with solenoid valves. In use, after the gas to be measured enters the gas chamber 2 through the inlet 9, the solenoid valves on the inlet and outlet close, sealing the cavity. The laser gas concentration telemetry device 4 is mounted on the first instrument base. The laser emitted by the laser gas concentration telemetry device 4 is reflected by the first reflector 3 after passing through the gas chamber 2, and then received by the laser gas concentration telemetry device 4 after passing through the gas chamber 2 again. The concentration of a specific gas in the gas to be measured in the gas chamber 2 is known. By comparing the reading of the laser gas concentration telemetry device 4 with this concentration, the accuracy of the laser gas concentration telemetry device 4 can be obtained. The first instrument base includes a first instrument base body and a first Y-axis slide rail. A Y-axis slider is provided on the first Y-axis slide rail, and the first instrument base body is fixed on the Y-axis slider. Moving the Y-axis slider along the first Y-axis slide rail allows the optical axis of the laser gas concentration telemeter 4 to move relative to the gas chamber 2, adjusting the position through which the laser passes and preventing inaccurate detection due to uneven distribution of the gas to be measured within the gas chamber 2. The gas chamber 2 is mounted on the base and is rotatably connected to the base. By rotating the gas chamber 2, the length of the laser passing through the gas to be measured can be adjusted. The gas chamber 2 includes a first glass plate, a second glass plate, and a side plate 12, which form a cavity. The first and second glass plates are arranged parallel to each other, and the inlet 9 and outlet 10 are both located on the side plate 12. The gas chamber 2 is connected to the base via a turntable, which includes a first disc and a second disc. The first disc and the second disc are rotatably connected, the first disc is fixedly connected to the gas chamber 2, and the second disc is fixedly connected to the base. It also includes an X-axis slide rail 1, on which a first slider is mounted, and a first instrument base or a first reflector 3 is mounted on the first slider. A second slider 7 is mounted on the X-axis slide rail 1, and a base is mounted on the second slider 7. A third slider 8 is mounted on the X-axis slide rail 1, on which the first instrument base is mounted, and the first reflector 3 is mounted on the third slider 8. The first instrument base body includes a base 5 and an arched clamp 6. Connecting pieces 13 are provided at both ends of the clamp 6, and the connecting pieces 13 are bolted to the base 5. The clamp 6 and the base 5 form a space for accommodating the laser methane remote sensing instrument. The first reflector 3 is made of aluminum alloy plate coated with a diffuse reflection coating.

[0031] Example 2

[0032] The difference between this embodiment and Embodiment 1 is that the cavity is connected to an infrared analyzer via a pipe. Since air is initially present in gas chamber 2, the discharge of air through the gas to be tested may cause a change in the concentration of a specific gas in the gas to be tested. The infrared analyzer is used to detect the concentration of the gas to be tested within gas chamber 2, which is taken as the actual concentration of the gas to be tested. Gas chamber 2 is connected to the base via a damping shaft. In this embodiment, any gas to be tested can be introduced into the cavity instead of a standard gas.

[0033] Example 3

[0034] A laser gas concentration remote sensing method, applied to laser gas concentration remote sensing measurement and detection devices, includes the following steps.

[0035] The gas to be tested is introduced into the gas chamber;

[0036] Fix the laser gas concentration telemeter to be measured on the first instrument base, and adjust the positions of the first instrument base, the gas chamber and the first reflector so that the light emitted by the laser gas concentration telemeter passes through the gas chamber and is reflected by the first reflector.

[0037] Depending on the testing requirements, the thickness of the light passing through the gas under test can be adjusted by rotating the gas chamber;

[0038] The concentration of a specific gas in the test gas in the gas chamber is detected by an infrared analyzer.

[0039] Example 4

[0040] A laser gas concentration remote sensing instrument measurement and detection box includes a box body, which is a closed space. The box body has a gas inlet and a gas outlet. The box body has a second instrument base and a second reflector. The box body has a second Y-axis slide rail, and the second instrument base and / or the second reflector are mounted on the second Y-axis slide rail. The second Y-axis slide rail also has a gas chamber.

[0041] The detection box in this embodiment is used in the following steps:

[0042] Fix the laser gas concentration telemeter to be detected on the second instrument base, turn on the laser gas concentration telemeter, so that the laser emitted by it is reflected by the second reflector and received by the laser gas concentration telemeter.

[0043] Open the gas outlet and introduce the gas to be tested into the chamber through the gas inlet;

[0044] The concentration of a specific gas in the test gas inside the chamber is detected by an infrared analyzer.

[0045] The detection results of the laser gas concentration telemetry instrument were compared with the detection results of the infrared analyzer.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser gas concentration telemetering instrument metrological detection device, characterized in that, The X-axis slide rail, the first instrument seat, the air chamber and the first reflecting plate are included, the air chamber is located between the first instrument seat and the first reflecting plate, the air chamber has a closed cavity, opposite surfaces of the cavity are transparent material, the cavity is communicated with a gas inlet and a gas outlet; A third sliding block is arranged on the X-axis slide rail, and the first reflecting plate is arranged on the third sliding block; The air chamber is arranged on the base and is rotationally connected with the base, The optical path of light in the cavity is adjusted, A second sliding block is arranged on the X-axis sliding rail, and the base is arranged on the second sliding block.

2. The laser gas concentration telemeter metering detection device according to claim 1, characterized in that, The first instrument seat includes a first instrument seat body and a first Y-axis slide rail, a Y-axis sliding block is arranged on the first Y-axis slide rail, and the first instrument seat body is fixed on the Y-axis sliding block.

3. The laser gas concentration telemeter metering detection device according to claim 2, characterized in that, The air chamber includes a first glass plate, a second glass plate and a side plate, the first glass plate, the second glass plate and the side plate surround the cavity, the first glass plate and the second glass plate are arranged in parallel, and the gas inlet and the gas outlet are arranged on the side plate.

4. A laser gas concentration remote sensing method, characterized in that, The application is applied to the laser gas concentration remote measuring instrument measurement and detection device in any one of claims 1-3, including the following steps, The air chamber is filled with the gas to be measured; The laser gas concentration remote measuring instrument to be measured is fixed on the first instrument seat, the positions of the first instrument seat, the air chamber and the first reflecting plate are adjusted, the light emitted by the laser gas concentration remote measuring instrument passes through the air chamber and is reflected by the first reflecting plate; According to the test requirement, the thickness of the gas to be measured through which the light passes is adjusted by rotating the air chamber; The concentration of the specific gas in the gas to be measured in the air chamber is detected by the infrared analyzer.

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