Telemetering calibration device
By designing a telemetry calibration device including a reflector, a three-ventilator and a detection module, the problem of cumbersome and inaccurate calibration process of the laser gas telemetry instrument in the prior art is solved, and efficient and accurate automatic calibration is achieved.
Patent Information
- Application Number
- CN202421912410.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-08
AI Technical Summary
The existing technology lacks special devices for effective calibration of laser gas telemeter, which leads to cumbersome and inaccurate calibration process, which is greatly affected by human factors, making it difficult to achieve rapid calibration.
A telemetry calibration device is designed, including a base, reflector, three-way air cell, fixed plate assembly, bracket, nitrogen air inlet, methane air inlet, detection module, methane tube and nitrogen pipe. The laser calibration plate and central collimation hole are used to ensure that the laser is accurately shot to the gas cell, and automated calibration is achieved using the detection module and display screen.
The calibration process is simplified, the influence of human factors is reduced, the accuracy and efficiency of calibration is improved, and the rapid calibration of the laser gas telemeter is ensured.
Smart Images
Figure CN222979438U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of instrument calibration, in particular to a telemetry calibration device. Background Art
[0002] A laser gas telemetry instrument is used to measure gas concentration. By using the spectral absorption technology, the gas concentration is obtained by analyzing the selective absorption of laser by the gas. The difference between it and the traditional infrared spectral absorption technology is that the spectral width of the semiconductor laser is much smaller than the broadening of the gas absorption line. The laser gas telemetry instrument is mainly used for methane gas leakage detection, especially suitable for leakage detection in areas where it is difficult for people to reach, such as overhead pipelines, risers, buried pipelines, pipelines in narrow spaces, etc.
[0003] Before leaving the factory, the laser gas telemetry instrument needs to be calibrated to ensure the accuracy of its measurement. During the long-term use of the laser gas telemetry instrument, the measurement may be inaccurate. If not calibrated in time, it will seriously affect the use effect of the laser gas telemetry instrument. However, in the prior art, there is a lack of a dedicated device for effectively calibrating the laser gas telemetry instrument. Most of them can only measure gases with different concentrations by manually holding the laser gas telemetry instrument. The control of the gas concentration is very troublesome, resulting in a more cumbersome calibration process. Moreover, the human factor has a greater impact on the calibration result, and it is impossible to ensure the calibration accuracy, making it difficult to quickly calibrate the laser gas telemetry instrument.
[0004] Therefore, there is an urgent need to provide a telemetry calibration device to improve the calibration accuracy of the laser gas telemetry instrument compared with the prior art. Summary of the Utility Model
[0005] The utility model solves the technical problems existing in the prior art and provides a telemetry calibration device.
[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0007] A telemetry calibration device includes a base, a reflector, a three-way gas cell, a fixing plate assembly, a bracket, a nitrogen gas inlet, a methane gas inlet, a detection module, a methane pipe, and a nitrogen pipe. The reflector, the three-way gas cell, and the fixing plate assembly are arranged at one end of the inner bottom of the base, and the bracket is arranged at the other end of the inner bottom of the base. The reflector, the three-way gas cell, and the fixing plate assembly are arranged in sequence from the side far away from the bracket to the side close to the bracket. A laser calibration plate is arranged inside the fixing plate assembly, a calibration hole is arranged on the bracket, and a central collimation hole is arranged on the laser calibration plate. The nitrogen gas inlet and the methane gas inlet are both arranged on the side wall of the base, and the detection module is arranged on the inner side wall of the base. The three-way gas cell is communicated with the methane gas inlet through the methane pipe, the three-way gas cell is communicated with the nitrogen gas inlet through the nitrogen pipe, and the three-way gas cell is also communicated with the detection module. The detection module is used to detect the concentration of methane inside the three-way gas cell.
[0008] Further, a first gas inlet is arranged on the three-way gas cell, a first gas pipe is communicated at the first gas inlet, and one end of the first gas pipe far away from the first gas inlet is communicated with the nitrogen pipe and the methane pipe through a three-way pipe fitting, and a switching valve is installed on the three-way pipe fitting.
[0009] Furthermore, a first gas outlet and a second gas outlet are also arranged on the three-way gas cell. The first gas outlet is communicated with the detection module, and the second gas outlet is communicated with the outside of the telemetry calibration device.
[0010] Furthermore, a first flowmeter is arranged on the side wall of the base. The first flowmeter is provided with a second gas inlet and a third gas outlet. A first gas pipe is communicated at the first gas outlet, one end of the first gas pipe far away from the first gas outlet is communicated with the second gas inlet, a second gas pipe is communicated at the third gas outlet, and one end of the second gas pipe far away from the third gas outlet is communicated with the detection module.
[0011] Furthermore, a second flowmeter is arranged on the side wall of the base. The second flowmeter is provided with a third gas inlet and a fourth gas outlet. A second gas pipe is communicated at the second gas outlet, one end of the second gas pipe far away from the second gas outlet is communicated with the third gas inlet, and the fourth gas outlet is communicated with the outside of the telemetry calibration device.
[0012] Further, a display screen is arranged on the side wall of the base, and the display screen is used to display the detection result of the detection module.
[0013] Further, the three-way gas cell is arranged obliquely.
[0014] Further, the calibration hole and the central collimation hole are coaxially arranged.
[0015] Furthermore, a support platform is provided inside the base, and the reflector, the three-way gas cell, the laser calibration plate, and the bracket are all connected to the upper wall of the support platform.
[0016] Furthermore, handles are provided on a set of opposite side walls of the base.
[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0018] (1) In the present utility model, the laser gas telemeter to be measured is installed on the bracket, methane is introduced into the three-way gas cell, the laser of the laser gas telemeter to be measured passes through the calibration hole and the central collimation hole and hits the center of the three-way gas cell, the laser passes through the center of the three-way gas cell and hits the reflector, the reading of the laser gas telemeter is displayed, then the gas concentration of methane in the three-way gas cell is detected by the detection module and displayed on the display screen. By judging the consistency between the reading on the display screen and the reading of the laser gas telemeter, the laser gas telemeter is calibrated. The calibration process is simple, less affected by human factors, and the calibration result has high accuracy.
[0019] (2) The gas path design in the detection process of the present utility model can ensure the accurate shunt and measurement of methane gas during the detection process, and at the same time ensure that the detection module can accurately measure the methane concentration and discharge the excess methane gas from the system.
[0020] (3) In the present utility model, by using the calibration hole and the laser calibration plate capable of making the infrared laser image, and the central collimation hole provided at the center of the calibration plate, it is ensured that the laser can accurately hit the gas cell. Further effectively reducing the influence of human factors makes the laser alignment more convenient and accurate. On this basis, more accurate and reliable results can be obtained in the subsequent calibration process. Description of the Drawings
[0021] Figure 1 is a schematic diagram of the overall structure of the present utility model.
[0022] Figure 2 is the present utility model and Figure 1 Schematic diagrams of the overall structure from different perspectives.
[0023] Figure 3 is a schematic diagram showing the internal structure of the present utility model.
[0024] Figure 4 is the present utility model and Figure 3 Schematic diagrams showing the internal structure from different perspectives.
[0025] Description of the Reference Numerals:
[0026] 1. Reflector; 2. Three-way gas pool; 201. First air inlet; 202. First air outlet; 203. Second air outlet; 3. Laser calibration plate; 31. Central collimation hole; 4. Fixed plate assembly; 5. Support platform; 6. Base; 61. Rear plate; 62. Front plate; 63. Bottom plate; 7. Methane inlet; 8. Nitrogen inlet; 9. Nitrogen pipe; 10. Methane pipe; 11. Three-way pipe fitting; 12. Switching valve; 13. First inlet pipe; 14. First outlet pipe; 15. Second outlet pipe; 16. Second inlet pipe; 17. Third outlet pipe; 18. Detection module; 19. Bracket; 191. Calibration hole; 20. Display screen; 21. First flowmeter; 211. Second air inlet; 212. Third air outlet; 22. Second flowmeter; 221. Third air inlet; 222. Fourth air outlet; 23. Handle. Detailed implementation manner
[0027] The technical solution of the present utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model. It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0028] Such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown in the figure, the utility model provides a telemetry calibration device, which includes a base 6, a support platform 5, a reflector 1, a three-way gas cell 2, a fixing plate assembly 4, a bracket 19 and a detection module 18. A support platform 5 is arranged inside the base 6. The reflector 1, the three-way gas cell 2, the fixing plate assembly 4 and the bracket 19 are all installed on the upper wall of the support platform 5. The reflector 1, the three-way gas cell 2 and the fixing plate assembly 4 are distributed at one end of the upper wall of the support platform 5, and the bracket 19 is installed at the other end of the upper wall of the support platform 5. On the upper wall of the support platform 5, the fixing plate assembly 4, the three-way gas cell 2 and the reflector 1 are arranged in sequence from the side close to the bracket 19 to the side far from the bracket 19; a calibration hole 191 is provided on the bracket 19, and a laser calibration plate 3 is arranged inside the fixing plate assembly 4. The laser calibration plate 3 can make the invisible infrared detection laser present as a red dot on its surface. The laser calibration plate 3 and an acrylic plate with a fixed shape are combined to form a central collimation hole 31, and the central collimation hole 31 is coaxially arranged with the calibration hole 191; a nitrogen gas inlet 8 and a methane gas inlet 7 are provided on the side wall of the base 6. The three-way gas cell 2 is connected to the nitrogen gas inlet 8 through a nitrogen gas pipe 9, and the three-way gas cell 2 is connected to the methane gas inlet 7 through a methane gas pipe 10; the three-way gas cell 2 is also internally connected to the detection module 18, and the detection module 18 is installed on the side wall of the base 6. The function of the reflector 1 is to diffusely reflect the received light to avoid the light being vertically reflected back to the module to be detected, thereby affecting the detection result; the three-way gas cell 2 has a certain inclination angle, which is set to 10° to the left in this embodiment. The purpose is also to avoid the detection laser being vertically reflected back to the detection module, thereby affecting the detection result; the fixing plate assembly 4 is used to fix the laser calibration plate 3.
[0029] The three-way gas cell 2 is provided with a first gas inlet 201, a first gas outlet 202 and a second gas outlet 203. The first gas inlet 201 and the first gas outlet 202 are arranged on a set of opposite side walls of the three-way gas cell 2, and the second gas outlet 203 is arranged on the upper wall of the three-way gas cell 2; the first gas inlet 201 is connected to a first gas pipe 13. One end of the first gas pipe 13 far from the first gas inlet 201 is connected to the nitrogen gas pipe 9 and the methane gas pipe 10 through a three-way pipe fitting 11, and a switching valve 12 is installed on the three-way pipe fitting 11 to control the connection or closing of the first gas pipe 13 with the nitrogen gas pipe 9 or the methane gas pipe 10 through the switching valve 12.
[0030] The base 6 includes a rear plate 61, a front plate 62 and a bottom plate 63. The rear plate 61 and the front plate 62 are distributed on the front and rear sides of the bottom plate 63. The rear plate 61 and the front plate 62 are both vertically and fixedly connected to the bottom plate 63, and the rear plate 61, the front plate 62 and the bottom plate 63 are integrally connected. The detection module 18, the methane gas inlet 7 and the nitrogen gas inlet 8 are all arranged on the inner wall of the front plate 62; a first flowmeter 21 and a second flowmeter 22 are provided on the outer side wall of the front plate 62. The first flowmeter 21 is provided with a second gas inlet 211 and a third gas outlet 212, and the second flowmeter 22 is provided with a third gas inlet 221 and a fourth gas outlet 222. The detection module 18 is provided with an inlet end and an outlet end.
[0031] The first air outlet 202 is communicated with the second air inlet 211 through the first air outlet pipe 14, and the third air outlet 212 is communicated with the inlet end of the detection module 18 through the second air inlet pipe 16; the second air outlet 203 is communicated with the third air inlet 221 through the second air outlet pipe 15, and the fourth air outlet 222 is communicated with the outside; the outlet end of the detection module 18 is communicated with the third air outlet pipe 17, and one end of the third air outlet pipe 17 away from the detection module 18 is communicated with the outside. Part of the methane discharged from the three-way gas cell 2 enters the detection module 18 through the first flowmeter 21 for concentration detection, and the remaining part is discharged outside the device through the second flowmeter 22. The amount of methane entering the detection module 18 can be reduced. Therefore, the diameter of the second air inlet pipe 16 can be made smaller. Because the detection module 18 has high precision, a small amount of methane gas entering the detection module 18 can also accurately detect the concentration.
[0032] A laser calibration plate 3 is arranged inside the fixing plate assembly 4. By using an acrylic plate to perform cross-focus alignment, the detection laser is imaged at the central collimation hole 31 in the middle of the laser calibration plate 3.
[0033] A display screen 20 is arranged on the outer side wall of the front plate 62. Inside the detection module 18, there are a PLC controller and a gas concentration sensor. The gas concentration sensor is electrically connected to an input end of the PLC controller, and an output end of the PLC controller is electrically connected to the display screen 20. The PLC controller displays the gas concentration measured by the gas concentration sensor on the display screen 20 in real time; the detection module 18 is not limited to using a gas concentration sensor to measure the methane concentration, and also includes other devices for measuring the gas concentration.
[0034] A handle 23 is arranged on the inner wall of the rear plate 61, and a handle 23 is also arranged on the inner wall of the front plate 62. The handle 23 arranged on the rear plate 61 and the handle 23 arranged on the front plate 62 are located at both ends of the base 6.
[0035] The working principle of a telemetry calibration device provided by the present utility model:
[0036] First step, initial alignment: First, align the detection laser of the laser gas telemeter to be calibrated with the calibration hole 191 to ensure that the laser passes through the calibration hole 191 and hits the fixing plate assembly 4. By adjusting the angle of the laser gas telemeter, the detection laser is aligned with the central collimation hole 31.
[0037] Second step, laser path adjustment: Remove the fixing plate assembly 4 to make the detection laser of the laser gas telemeter pass through the calibration hole 191 and the central collimation hole 31 and directly hit the center of the three-way gas cell 2.
[0038] Step 3, Gas Introduction: Connect the methane inlet 7 to a methane gas cylinder with a known concentration outside, adjust the switching valve 12 to connect the first inlet pipe 13 to the methane pipe 10, and introduce methane gas into the calibration device. The methane gas enters the inside of the three-way gas cell 2 through the first inlet pipe 13, discharging the original nitrogen gas. Continuously introduce methane gas until the methane concentration reading measured by the detection module 18 on the display screen 20 stabilizes and is consistent with the concentration marked on the methane gas cylinder, confirming that the inside of the three-way gas cell 2 is all methane gas without other gas impurities.
[0039] Step 4, Reading Comparison: Read the reading of the laser gas remote sensor and compare it with the reading displayed on the display screen 20. If they are the same, calibration is not required; otherwise, calibration is needed.
[0040] Step 5, Multiple Calibrations: Replace the methane gas with different concentrations and enter the three-way gas cell 2, repeat the above steps to calibrate the laser gas remote sensor to test its accuracy. When replacing the methane gas with different concentrations each time, nitrogen gas needs to be introduced first to clean the remaining methane gas in the three-way gas cell 2 with nitrogen gas. When introducing nitrogen gas, connect the nitrogen inlet 8 to an external nitrogen gas cylinder, adjust the switching valve 12 to connect the first inlet pipe 13 to the nitrogen pipe 9, and make the nitrogen gas enter the three-way gas cell 2.
[0041] Step 6, Equipment Restoration: After all tests are completed, remove the laser gas remote sensor to be tested from the bracket 19, and insert the fixed plate assembly 4 back onto the base 63. Adjust the switching valve 12 to connect the first inlet pipe 13 to the nitrogen pipe 9, introduce nitrogen gas into the three-way gas cell 2 until the reading on the display screen 20 is 0, indicating that the methane in the three-way gas cell 2 is emptied. Finally, close the switching valve 12 to complete the restoration.
[0042] During the detection process, the gas path is as follows:
[0043] 1. Introduction of Methane Gas: Methane gas is output from the gas cylinder and enters the three-way gas cell 2 through the first inlet pipe 13.
[0044] 2. Shunt of Methane Gas: The methane gas output from the three-way gas cell 2 is divided into two parts.
[0045] 3. Path of the First Part of Methane Gas: One part of the methane enters the first flowmeter 21 through the first outlet 202, and then flows into the detection module 18 from the third outlet 212 of the first flowmeter 21 for methane concentration detection. The methane concentration value measured by the detection module 18 is displayed on the display screen 20. The methane flowing into the detection module 18 will be discharged through the third outlet pipe 17.
[0046] 4. Path of the second part of methane gas: Another part of methane flows into the second flowmeter 22 through the second air outlet 203, and is directly discharged through the fourth air outlet 222 of the second flowmeter 22.
[0047] Through such a gas path design, it can ensure the accurate shunting and measurement of methane gas during the detection process, and at the same time ensure that the detection module 18 can accurately measure the methane concentration and discharge the excess methane gas from the system.
[0048] In this utility model, the laser gas telemeter to be measured is installed on the bracket 19, methane is introduced into the three-way gas cell 2, the laser of the laser gas telemeter to be measured passes through the calibration hole 191 and the central collimation hole 31 and hits the center of the three-way gas cell 2, the laser passes through the center of the three-way gas cell 2 and hits the reflector 1, the reading of the laser gas telemeter is displayed, then the detection module 18 detects the gas concentration of methane in the three-way gas cell 2 and displays it on the display screen 20. By judging the consistency between the reading on the display screen 20 and the reading of the laser gas telemeter, the laser gas telemeter is calibrated. The calibration process is simple, less affected by human factors, and the calibration result has a higher accuracy.
[0049] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present utility model, rather than limiting the protection scope of the present utility model. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present utility model does not depart from the essence and scope of the technical solution of the present utility model.
Claims
1. A telemetry calibration device, characterized in that: The utility model comprises a base, a reflector, a three-way gas pool, a fixed plate assembly, a bracket, a nitrogen inlet, a methane inlet, a detection module, a methane pipe and a nitrogen pipe, wherein the reflector, the three-way gas pool and the fixed plate assembly are arranged at one end of the inner bottom of the base, and the bracket is arranged at the other end of the inner bottom of the base; the reflector, the three-way gas pool and the fixed plate assembly are arranged in sequence from a side away from the bracket to a side close to the bracket; a laser calibration plate is arranged in the fixed plate assembly, a calibration hole is arranged on the bracket, and a central alignment hole is arranged on the laser calibration plate; the nitrogen inlet and the methane inlet are both arranged on the side wall of the base, and the detection module is arranged on the inner side wall of the base; the three-way gas pool is connected with the methane inlet through the methane pipe, the three-way gas pool is connected with the nitrogen inlet through the nitrogen pipe, and the three-way gas pool is also connected with the detection module; the detection module is used to detect the concentration of methane inside the three-way gas pool.
2. A telemetry calibration device according to claim 1, characterized in that: The three-way gas pool is provided with a first air inlet, which is connected to a first air inlet pipe. An end of the first air inlet pipe away from the first air inlet is connected to the nitrogen pipe and the methane pipe through a three-way pipe fitting, and a switching valve is installed on the three-way pipe fitting.
3. A telemetry calibration device according to claim 2, characterized in that: The three-way gas pool is also provided with a first gas outlet and a second gas outlet, wherein the first gas outlet is connected to the detection module, and the second gas outlet is connected to the outside of the telemetry calibration device.
4. A telemetry calibration device according to claim 3, characterized in that: The side wall of the base is provided with a first flow meter, and the first flow meter is provided with a second air inlet and a third air outlet. The first air outlet is connected to the first air outlet pipe, and the first air outlet pipe is connected to the second air inlet at one end away from the first air outlet, and the third air outlet is connected to the second air inlet pipe, and the second air inlet pipe is connected to the detection module at one end away from the third air outlet.
5. A telemetry calibration device according to claim 3, characterized in that: A second flow meter is provided on the side wall of the base, and the second flow meter is provided with a third air inlet and a fourth air outlet. The second air outlet is connected to a second air outlet pipe, and the second air outlet pipe is connected to the third air inlet at one end away from the second air outlet, and the fourth air outlet is connected to the outside of the telemetry calibration device.
6. A telemetry calibration device according to claim 1, characterized in that: The side wall of the base is provided with a display screen, and the display screen is used to display the detection result of the detection module.
7. A telemetry calibration device according to claim 1, characterized in that: The three-way aeration pool is arranged obliquely.
8. A telemetry calibration device according to claim 1, characterized in that: The calibration hole is coaxially arranged with the central alignment hole.
9. A telemetry calibration device according to claim 1, characterized in that: A support platform is provided inside the base, and the reflector, the three-way air pool, the laser calibration plate and the bracket are all connected to the upper wall of the support platform.
10. A telemetry calibration device according to claim 1, characterized in that: A group of opposite side walls of the base are provided with handles.