CN112378962A - Method and system for synchronously testing response characteristics and thermodynamic parameters of gas sensor - Google Patents
Method and system for synchronously testing response characteristics and thermodynamic parameters of gas sensor Download PDFInfo
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- CN112378962A CN112378962A CN202011014915.XA CN202011014915A CN112378962A CN 112378962 A CN112378962 A CN 112378962A CN 202011014915 A CN202011014915 A CN 202011014915A CN 112378962 A CN112378962 A CN 112378962A
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- 238000012360 testing method Methods 0.000 title claims abstract description 95
- 230000004044 response Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 25
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 26
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims abstract description 26
- 230000001360 synchronised effect Effects 0.000 claims abstract 2
- 239000004033 plastic Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000004831 Hot glue Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000007084 catalytic combustion reaction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
A synchronous testing method and system for response characteristics and thermodynamic parameters of a gas sensor comprise an infrared gas analyzer, a gas distribution device, a three-head switch, an infrared thermal imager, a gas testing cavity and a sensor; the infrared gas analyzer is in signal connection with the gas distribution device, and the first connecting pipe is arranged at the gas outlet end of the gas distribution device and is communicated with the three-head switch; the fourth connecting pipe is arranged at the air outlet end of the second syringe injector and is communicated with the three-head switch; the second connecting pipe is arranged on the three-head switch and is communicated with the air inlet pipe, and the third connecting pipe is arranged on the air outlet pipe and is communicated with the first syringe injector; the sensor is arranged on the rubber plug and is positioned in the gas testing cavity; the infrared germanium glass is arranged on the gas testing cavity, the thermal infrared imager is arranged on the infrared germanium glass, the thermal infrared imager is in signal connection with a computer, and the power supply is electrically connected with the sensor. The invention has the advantages of simple structure, small volume, prevention of test gas waste and low cost, and can simultaneously detect the response of the gas sensor and the temperature change.
Description
Technical Field
The invention relates to the technical field of performance test systems of gas sensors, in particular to a method and a system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor.
Background
The detection principle of the catalytic combustion type sensor depends on the combustion heat release of the gas to be detected, and the released heat is converted into the change of resistance by the thermosensitive element so as to reflect the concentration value of the gas. However, the emitted heat may have a higher temperature under normal conditions, which affects the performance of the sensor, for example, methane gas is used as an example, the methane catalytic combustion sensor is widely applied to monitoring gas under a mine, the sensor has a mature process and a low cost, but in a high-temperature catalytic condition and a severe downhole environment, the performance of the sensor is very easy to degrade, and frequent calibration is required. Therefore, the working temperature of the catalytic methane sensor is the main reason influencing the long-term working of the sensor, and when the performance of the manufactured sensor is tested, if the corresponding temperature change can be obtained along with the response change of the sensor, the verification and the improvement of the sensor process are very facilitated. At present, a detection device for the performance of a catalytic combustion type sensor element generally adopts an empty box structure, so that the operation is convenient, however, the structure has larger volume and higher cost, and the waste of test gas is serious; an infrared radiation camera is generally adopted for thermodynamic parameter testing of the sensor element and is used for non-contact measurement of the element, and the method is mature but too simple, can only test the temperature of the element at a certain moment and cannot obtain the real-time performance of the sensor element in time, so that the reliability of a gas detection system is reduced; and no research has been shown at present to detect temperature changes and response changes simultaneously; in order to solve the above problems, the present application provides a method and a system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides a method and a system for synchronously testing the response characteristics and thermodynamic parameters of a gas sensor, which have the advantages of simple and convenient structure, small volume, test gas saving, detection gas loss reduction, cost saving by two injectors and 2.5mm infrared germanium glass sheets, simple operation and capability of simultaneously detecting the response and temperature change of the gas sensor.
(II) technical scheme
The invention provides a method and a system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor, which comprise an infrared gas analyzer, a gas distribution device, a power supply, a second syringe injector, a three-head switch, a thermal infrared imager, a gas testing cavity, infrared germanium glass, a multifunctional electric meter, a sensor, a computer, a rubber plug, a first syringe injector, a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a gas inlet pipe and a gas outlet pipe;
the infrared gas analyzer is in signal connection with the gas distribution device, and the first connecting pipe is arranged at the gas outlet end of the gas distribution device and is communicated with the three-head switch; the fourth connecting pipe is arranged at the air outlet end of the second syringe injector and is communicated with the three-head switch; the gas inlet pipe and the gas outlet pipe are arranged on the gas testing cavity and are positioned on two opposite sides of the gas testing cavity, the second connecting pipe is arranged on the three-head switch and is communicated with the gas inlet pipe, and the third connecting pipe is arranged on the gas outlet pipe and is communicated with the first syringe injector; the top end of the gas testing cavity is provided with a first through hole, and the bottom end of the gas testing cavity is provided with a second through hole; the rubber plug is matched and connected with the gas testing cavity and seals the second through hole on the gas testing cavity, and the sensor is arranged on the rubber plug and is positioned in the gas testing cavity; the infrared germanium glass is arranged on the gas testing cavity and seals the first through hole, the thermal infrared imager is arranged on the infrared germanium glass, and a camera on the thermal infrared imager is opposite to the sensor; the thermal infrared imager is in signal connection with a computer, and the power supply is electrically connected with the sensor; one end of the multifunctional electric meter is electrically connected with the sensor, and the other end of the multifunctional electric meter is in signal connection with the computer.
Preferably, the first syringe injector and the second syringe injector have a capacity of 150 ml.
Preferably, the gas test chamber has a volume of 125 ml.
Preferably, the gas testing chamber is made of plastic.
Preferably, a wheatstone bridge circuit is arranged in the multifunctional electricity meter, and the wheatstone bridge circuit converts the state signal of the sensor into an electric signal.
Preferably, the sensor is provided with a base which is a four-pin plastic base, one end of a copper wire penetrates through the cavity plug of the silica gel and is connected with the four pins of the base, and the other end of the copper wire is electrically connected with the Wheatstone bridge circuit.
Preferably, the gap between the base and the rubber plug is sealed by a hot glue gun.
Preferably, the infrared germanium glass is an infrared germanium glass sheet with the outer diameter of 2.5 mm.
Preferably, the thermal infrared imager is a FLIR A655sc thermal infrared imager.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects: during detection, the sensor is arranged on the rubber plug, and then the rubber plug is plugged into the second through hole on the gas testing cavity, so that the sensor enters the gas testing cavity; the gas testing cavity is made of plastic so as to ensure the tightness of gas in the cavity; after a power supply is turned on, the sensor is in a working state for minutes, the thermal infrared imager and the infrared germanium glass are arranged on the gas testing cavity and are attached to the first through hole, the FLIR A655sc thermal infrared imager is turned on to observe the sensor through the lens and the infrared germanium glass and start to record temperature change, then the condition of the environment around the gas testing cavity is detected, actual temperature parameters are adjusted, and dynamic change data of the temperature are recorded on computer software; and under the condition of ensuring that the gas testing cavity is fixed and the gas tightness is good, the gas outlet pipe on the gas testing cavity is connected with a 150ml first syringe injector through a third connecting pipe, and the air in the syringe injector can be exhausted when the syringe injector starts to work. The air outlet pipe on the air test cavity is connected with a three-head switch through a second connecting pipe, so that when the air test cavity works, two ends of the second syringe injector and the air distribution device are firstly opened, 125ml of gas with the same volume is extracted from the air distribution device, then two ends of the second syringe injector and the air test cavity are opened, and the gas is input into the first syringe injector from the second syringe injector. Note that the gas dispensing device should dispense up to twice the concentration of gas required in the gas test chamber. In the test process, the two syringe injectors can be pushed back and forth, so that the gas in the gas test cavity can be promoted to better circulate; the multifunctional electric meter converts the state signal of the sensor into an electric signal through a Wheatstone bridge circuit arranged inside the multifunctional electric meter and transmits the electric signal to a computer; the whole device is powered by a power supply; the test system has the advantages of simple and convenient structure, small volume, test gas saving, detection gas loss reduction, cost saving by two injectors and 2.5mm infrared germanium glass sheets, simple operation and capability of simultaneously detecting the response and temperature change of the gas sensor.
Drawings
Fig. 1 is a schematic structural diagram of a method and a system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor according to the present invention.
Fig. 2 is a front view of a gas testing chamber in a method and a system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor according to the present invention.
Fig. 3 is a top view of a gas testing chamber in a method and a system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor according to the present invention.
Fig. 4 is a left side view of a gas testing chamber in a method and system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor according to the present invention.
Reference numerals: 1. an infrared gas analyzer; 2. a gas distribution device; 3. a power source; 4. a second syringe injector; 5. a three-head switch; 6. a thermal infrared imager; 7. a gas testing chamber; 8. infrared germanium glass; 9. a multifunctional electric meter; 10. a sensor; 11. a computer; 12. a rubber plug; 13. a first syringe injector; 14. a first connecting pipe; 15. a second connecting pipe; 16. a third connecting pipe; 17. a fourth connecting pipe; 18. an air inlet pipe; 19. an air outlet pipe; 20. a first through hole; 21. a second via.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-4, the method and system for synchronously testing response characteristics and thermodynamic parameters of a gas sensor provided by the invention comprise an infrared gas analyzer 1, a gas distribution device 2, a power supply 3, a second syringe injector 4, a three-head switch 5, a thermal infrared imager 6, a gas testing cavity 7, infrared germanium glass 8, a multifunctional electric meter 9, a sensor 10, a computer 11, a rubber plug 12, a first syringe injector 13, a first connecting pipe 14, a second connecting pipe 15, a third connecting pipe 16, a fourth connecting pipe 17, an air inlet pipe 18 and an air outlet pipe 19;
the infrared gas analyzer 1 is in signal connection with the gas distribution device 2, and the first connecting pipe 14 is arranged at the gas outlet end of the gas distribution device 2 and is communicated with the three-head switch 5; the fourth connecting pipe 17 is arranged at the air outlet end of the second syringe injector 4 and is communicated with the three-head switch 5; the air inlet pipe 18 and the air outlet pipe 19 are arranged on the air testing cavity 7 and are positioned on two opposite sides of the air testing cavity 7, the second connecting pipe 15 is arranged on the three-head switch 5 and is communicated with the air inlet pipe 18, and the third connecting pipe 16 is arranged on the air outlet pipe 19 and is communicated with the first syringe injector 13; the top end of the gas testing cavity 7 is provided with a first through hole 20, and the bottom end is provided with a second through hole 21; the rubber plug 12 is matched and connected with the gas testing cavity 7 and seals the second through hole 21 on the gas testing cavity 7, and the sensor 10 is arranged on the rubber plug 12 and is positioned in the gas testing cavity 7; the infrared germanium glass 8 is arranged on the gas testing cavity 7 and seals the first through hole 20, the thermal infrared imager 6 is arranged on the infrared germanium glass 8, and a camera on the thermal infrared imager 6 is opposite to the sensor 10; the thermal infrared imager 6 is in signal connection with a computer, and the power supply 3 is electrically connected with the sensor 10; one end of the multifunctional electricity meter 9 is electrically connected with the sensor 10, and the other end of the multifunctional electricity meter 9 is in signal connection with the computer 11.
In an alternative embodiment, the first syringe injector 13 and the second syringe injector 4 have a capacity of 150 ml.
In an alternative embodiment, the gas test chamber 7 has a volume of 125 ml.
In an alternative embodiment, the gas test chamber 7 is made of plastic.
In an alternative embodiment, a wheatstone bridge circuit is provided inside multifunctional electric meter 9, and converts the status signal of sensor 10 into an electric signal.
In an alternative embodiment, the sensor 10 is provided with a base, the base is a four-pin plastic base, one end of a copper wire penetrates through the cavity plug of the silica gel and is connected with the four pins of the base, and the other end of the copper wire is electrically connected with the wheatstone bridge circuit.
In an alternative embodiment, the gap between the base and the rubber stopper 12 is sealed by a hot glue gun to prevent the escape of gas from the chamber.
In an alternative embodiment, the infrared germanium glass 8 is an infrared germanium glass sheet with an outer diameter Φ 2.5 mm.
In an alternative embodiment, the thermal infrared imager 6 is a FLIR a655sc thermal infrared imager, which can adjust the actual temperature parameters according to the conditions of the environment around the gas test chamber 7 and record the data of the dynamic changes of the temperature on the computer software.
In the invention, during detection, the sensor 10 is arranged on the rubber plug 12, and then the rubber plug 12 is plugged into the second through hole 21 on the gas testing cavity 7, so that the sensor 10 enters the gas testing cavity 7; the gas testing cavity 7 is made of plastic to ensure the tightness of gas in the cavity; turning on a power supply 3, enabling the sensor 10 to be in a working state for 10 minutes, arranging the thermal infrared imager 6 and the infrared germanium glass 8 on the gas testing cavity 7 and attaching the thermal infrared imager 6 and the infrared germanium glass 8 to the first through hole 20, turning on the FLIR A655sc thermal infrared imager 6 to observe the sensor 10 through a lens and the infrared germanium glass 8 and start to record temperature change, and then adjusting the condition of the environment around the gas testing cavity 7 to be detected to actual temperature parameters and recording dynamic change data of the temperature on computer software; and under the condition that the gas testing cavity 7 is fixed and the gas tightness is good, the gas outlet pipe 19 on the gas testing cavity 7 is connected with a 150ml first syringe injector 13 through a third connecting pipe 16, and the air in the syringe injector can be exhausted when the syringe injector starts to work. The air outlet pipe 18 on the gas testing cavity 7 is connected with a three-head switch 5 through a second connecting pipe 15, so that when the gas testing cavity works, the two ends of the second syringe injector 4 and the gas distribution device 2 are firstly opened, then 125ml of gas with the same volume is pumped out from the gas distribution device 2, then the two ends of the second syringe injector 4 and the gas testing cavity 7 are opened, and the gas is input into the first syringe injector 13 from the second syringe injector 4. Note that the gas dispensing means 2 should dispense up to twice the concentration of gas required in the gas testing chamber 7. In the test process, the two syringe injectors can be pushed back and forth, so that the gas in the gas test cavity 7 can be promoted to better circulate; the multifunctional electric meter 9 converts the state signal of the sensor 10 into an electric signal through a Wheatstone bridge circuit arranged inside and transmits the electric signal to the computer 11; the whole device is powered by a power supply 3; the test system has the advantages of simple and convenient structure, small volume, test gas saving, detection gas loss reduction, cost saving by two injectors and 2.5mm infrared germanium glass sheets, simple operation and capability of simultaneously detecting the response and temperature change of the gas sensor.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A synchronous testing method and system for response characteristics and thermodynamic parameters of a gas sensor are characterized by comprising an infrared gas analyzer (1), a gas distribution device (2), a power supply (3), a second syringe injector (4), a three-head switch (5), a thermal infrared imager (6), a gas testing cavity (7), infrared germanium glass (8), a multifunctional electric meter (9), a sensor (10), a computer (11), a rubber plug (12), a first syringe injector (13), a first connecting pipe (14), a second connecting pipe (15), a third connecting pipe (16), a fourth connecting pipe (17), an air inlet pipe (18) and an air outlet pipe (19);
the infrared gas analyzer (1) is in signal connection with the gas distribution device (2), and the first connecting pipe (14) is arranged at the gas outlet end of the gas distribution device (2) and is communicated with the three-head switch (5); the fourth connecting pipe (17) is arranged at the air outlet end of the second syringe injector (4) and is communicated with the three-head switch (5); the air inlet pipe (18) and the air outlet pipe (19) are arranged on the air testing cavity (7) and are positioned at two opposite sides of the air testing cavity (7), the second connecting pipe (15) is arranged on the three-head switch (5) and is communicated with the air inlet pipe (18), and the third connecting pipe (16) is arranged on the air outlet pipe (19) and is communicated with the first syringe injector (13); the top end of the gas testing cavity (7) is provided with a first through hole (20), and the bottom end is provided with a second through hole (21); the rubber plug (12) is matched and connected with the gas testing cavity (7) and seals a second through hole (21) in the gas testing cavity (7), and the sensor (10) is arranged on the rubber plug (12) and is positioned in the gas testing cavity (7); the infrared germanium glass (8) is arranged on the gas testing cavity (7) and seals the first through hole (20), the thermal infrared imager (6) is arranged on the infrared germanium glass (8), and a camera on the thermal infrared imager (6) is opposite to the sensor (10); the thermal infrared imager (6) is in signal connection with a computer, and the power supply (3) is electrically connected with the sensor (10); one end of the multifunctional electric meter (9) is electrically connected with the sensor (10), and the other end of the multifunctional electric meter (9) is in signal connection with the computer (11).
2. A method and system for testing the response characteristics of a gas sensor in synchrony with thermodynamic parameters according to claim 1, wherein the first syringe injector (13) and the second syringe injector (4) have a capacity of 150 ml.
3. The method and system for synchronously testing the response characteristic and the thermodynamic parameter of the gas sensor according to claim 1, wherein the capacity of the gas testing cavity (7) is 125 ml.
4. The method and system for synchronously testing the response characteristics and the thermodynamic parameters of the gas sensor according to claim 1, wherein the gas testing cavity (7) is made of plastic.
5. The method and system for synchronously testing the response characteristics and the thermodynamic parameters of the gas sensor according to claim 1, wherein a Wheatstone bridge circuit is arranged in the multifunctional electricity meter (9), and the Wheatstone bridge circuit converts the state signals of the sensor (10) into electric signals.
6. The method and the system for synchronously testing the response characteristic and the thermodynamic parameter of the gas sensor according to claim 5, wherein the sensor (10) is provided with a base, the base is a four-pin plastic base, one end of a copper wire penetrates through a cavity plug of silica gel and is connected with four pins of the base, and the other end of the copper wire is electrically connected with a Wheatstone bridge circuit.
7. The method and the system for synchronously testing the response characteristics and the thermodynamic parameters of the gas sensor according to claim 6, wherein a gap between the base and the rubber plug (12) is sealed by a hot glue gun.
8. The method and system for synchronously testing the response characteristic and the thermodynamic parameter of the gas sensor according to claim 1, wherein the infrared germanium glass (8) is an infrared germanium glass sheet with an outer diameter of 2.5 mm.
9. The method and the system for synchronously testing the response characteristics and the thermodynamic parameters of the gas sensor according to claim 1, wherein the thermal infrared imager (6) is an FLIR A655sc type thermal infrared imager.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011014915.XA CN112378962A (en) | 2020-09-24 | 2020-09-24 | Method and system for synchronously testing response characteristics and thermodynamic parameters of gas sensor |
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| CN202011014915.XA CN112378962A (en) | 2020-09-24 | 2020-09-24 | Method and system for synchronously testing response characteristics and thermodynamic parameters of gas sensor |
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Application publication date: 20210219 |