CN114414629A - Gas sensing dynamic testing device and gas sensing testing method - Google Patents
Gas sensing dynamic testing device and gas sensing testing method Download PDFInfo
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- CN114414629A CN114414629A CN202111492599.1A CN202111492599A CN114414629A CN 114414629 A CN114414629 A CN 114414629A CN 202111492599 A CN202111492599 A CN 202111492599A CN 114414629 A CN114414629 A CN 114414629A
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- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 47
- 239000010935 stainless steel Substances 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 abstract description 8
- 238000004891 communication Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 241000218202 Coptis Species 0.000 description 1
- 235000002991 Coptis groenlandica Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction 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
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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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
Abstract
The application discloses a gas sensing dynamic testing device and a gas sensing testing method, wherein the gas sensing dynamic testing device comprises a cavity and an electric signal transmission unit; the cavity is a stainless steel cavity and is divided into an upper cavity and a lower cavity, and the lower end face of the upper cavity is the upper end face of the lower cavity; the upper cavity is provided with a cover body in sealing connection; the electric signal transmission unit comprises a test module; the electric signal transmission unit is connected with the lower cavity; the side wall of the upper cavity is provided with an air inlet and an air outlet; the lower end surface of the upper cavity is provided with a through hole for mounting an electrode; a sensing element to be detected is arranged in the cavity; the test module is in electrical communication with the sensor element to be tested. The electrical shielding performance of the current gas sensing test cavity is improved, and meanwhile, gas to be tested can enter the cavity instantly, so that the accuracy and effectiveness of test data are guaranteed.
Description
Technical Field
The application relates to a gas sensing dynamic testing device and a gas sensing testing method, and belongs to the field of electronic information sensors.
Background
The gas sensing test cavity is an important component for testing a gas sensing sample in a laboratory, and the gas tightness, the electromagnetic signal shielding property and the gas circulation property of the gas sensing test cavity are directly related to the accuracy, the reliability and the rigor of gas sensing test data.
Currently, a glass/quartz tube with two ends sealed by stainless steel flanges, a square plastic cavity containing a test circuit board, a cylindrical polytetrafluoroethylene cavity introduced by an electric connector and the like are mostly adopted in a gas test cavity in a laboratory. However, the glass cavity and the plastic cavity have electromagnetic signal interference, which seriously affects the baseline of the test circuit and the accuracy of the test data, and further may cause adverse effects on the performances of sensitivity, selectivity and the like of the obtained gas after the current or resistance data is processed after calculation and calculation. The stainless steel cavity introduced by the electric connector can effectively solve the problem of electric signal shielding, however, most cavities have the problem of large testing volume at present, and when the cavity is filled with detection gas and the detection gas is diffused to the surface of the sensing element, a certain time is needed, so that the corresponding speed of the material is deviated from reality, and the intrinsic testing accuracy of the material is indirectly influenced.
Disclosure of Invention
According to the scheme, the miniature stainless steel testing cavity capable of being simply disassembled is designed, so that the gas to be tested can enter the cavity instantly while the electrical shielding performance of the current gas sensing testing cavity is improved, and the accuracy and effectiveness of testing data are guaranteed.
In one aspect of the present application, a gas sensing dynamic test device is provided, which includes a cavity and a test module;
the cavity is a stainless steel cavity; the device is divided into an upper cavity and a lower cavity, and the lower end face of the upper cavity is the upper end face of the lower cavity;
the upper cavity is provided with a cover body in sealing connection;
the side wall of the upper cavity is provided with an air inlet and an air outlet;
the lower end surface of the upper cavity is provided with a through hole;
a sensing element to be detected is arranged in the upper cavity;
the test module is fixed on the lower cavity and is electrically communicated with the sensing element to be tested through a lead;
the wire passes through the through hole.
The problem of shielding electromagnetic signals is effectively solved while the purity of the gas is not influenced;
optionally, the through holes for mounting the electrodes comprise N through holes, where N is an even number, which can satisfy simultaneous measurement of multiple samples.
Optionally, N ═ 4 is respectively connected to 2 sensor elements to be measured.
Optionally, the upper chamber is a square chamber, maximizing improved gas and sample contact.
Optionally, the volume of the square cavity is 16-50 cm3。
Optionally, the volume of the square cavity is 16-25 cm3。
Optionally, the cover is a detachable cover; the sample cavity cover with the quartz observation window can be replaced to carry out the photo-assisted gas sensing test; the cover body part uses a stainless steel plate with four screws, and the closed cavity can be closed by screwing and unscrewing; the cavity is provided with a sealing ring, and the cavity is sealed after the bolt is screwed down, so that the air tightness of the cavity is realized.
Optionally, the test module is a flanged electrode; the BNC electrode is connected from the lower part of the cavity, so that the height of the testing cavity can be reduced, the sample loading is convenient, and the electrode is introduced from the side in the prior art, so that the operation difficulty of sample placing is caused by the fact that the volume of the cavity is increased or the height is increased.
As a specific embodiment, the gas sensing dynamic test device described in the present application is a square all-stainless steel cavity with an upper cover plate portion and a lower electrical signal shielding box portion. The upper cover part is made of a stainless steel plate with four screws, and the sealed cavity can be closed by screwing and unscrewing. The cavity is provided with a sealing ring, and the cavity is sealed after the bolt is screwed down, so that the air tightness of the cavity is realized. The lower part of the cavity is an electrical signal transmission part, and electrodes using threaded BNC are uniformly fixed on a lower steel plate by using a BNC connector with a flange. The BNC outer layer flange can be in direct contact with the stainless steel wall, so that the problem of electric signal shielding is effectively solved while electric signal transmission is realized.
As another specific implementation method, the gas sensing dynamic test device has the volume of 16cm3The square cavity can maximally realize the contact between the gas and the sample, and can meet the requirement of simultaneous measurement of the two samples. The upper cover part is made of stainless steel with four screwsThe steel plate has a 2mm groove at a distance of 25mm from the center. The lower cavity with the sealing ring can be directly covered, and the sealing of the cavity can be realized by screwing the bolt, so that the air tightness of the cavity is realized. The lower part of the cavity is an electrical signal transmission part, so that the air tightness is ensured, the effective shielding of an electrical signal is realized, and the convenience of loading a sample is realized. By using a flanged BNC fitting, the electrode using a threaded BNC is uniformly fixed on the lower steel plate. The BNC outer layer flange can be in direct contact with the stainless steel wall, so that the problem of electric signal shielding is effectively solved while electric signal transmission is realized.
In yet another aspect of the present application, there is provided a method of gas sensing testing, the method comprising the steps of:
placing a sensing element to be tested in a gas sensing dynamic testing device, and inputting and outputting an electric signal through a testing module after gas to be tested is introduced to complete testing;
wherein, the gas sensing dynamic testing device is selected from the gas sensing dynamic testing devices.
Optionally, the sensing element to be tested is placed in a closed cavity of the gas sensing dynamic testing device, and is connected with the testing electrode.
Optionally, the flow rate of the gas to be detected is 20-800 sccm.
The beneficial effects that this application can produce include:
the utility model provides a miniature stainless steel test cavity device that can simply dismantle, adopts square full stainless steel cavity, can maximize and realize gaseous and sample quick contact, can satisfy a plurality of sample simultaneous measurements, when the electricity shielding property of the current gas sensing test cavity of improvement, can realize that the gas that awaits measuring gets into the cavity in the twinkling of an eye to guarantee test data's accurate nature and validity.
Drawings
FIG. 1 is a schematic structural diagram of a gas sensing dynamic test apparatus;
FIG. 2 is a schematic internal view of a gas sensing dynamic test apparatus.
In the figure, 1, stainless steel cover plate, 2, screw hole, 3, stainless steel upper cavity, 4, air inlet, 5, screw hole, 6, BNC groove, 7, screw hole, 8, stainless steel plate, 9, stainless steel plate, 10, screw hole, 11, B screw hole, 12, seal groove, 13, stainless steel inner cavity, 14, inner air outlet, 15, electrode hole.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Example 1
The embodiment provides a gas sensing dynamic testing device, which comprises a stainless steel upper cavity 3 and a stainless steel lower cavity, wherein the stainless steel lower cavity consists of a stainless steel plate 8, a stainless steel plate 9 and the lower end surface of the stainless steel upper cavity 3; the stainless steel upper cavity 3 is provided with a stainless steel cover plate 1, and the stainless steel cover plate 1 is hermetically connected with the stainless steel upper cavity 3 through a sealing ring;
the side wall of the stainless steel upper cavity 3 is provided with an inlet hole 4 and an outlet hole 14; the lower end surface is provided with 4 through holes 15 which are uniformly distributed;
the test module is fixed on the lower cavity through the BNC groove 6, the silver-plated copper wire penetrates through the through hole 15, one end of the silver-plated copper wire is electrically connected with two samples to be tested in the stainless steel upper cavity, and the other end of the silver-plated copper wire is electrically connected with the BNC electrode, so that effective transmission of electric signals of the gas test cavity and the test instrument is realized.
Example 2
The embodiment provides a specific gas sensing dynamic testing device, as shown in fig. 1 and 2, a stainless steel cover plate 1 is connected to a stainless steel cavity 3 through a threaded hole 2 by using a screw with a guide hole in sequence from top to bottom; and constructing a sealed stainless steel cavity. A sealing ring is placed in a sealing groove 12 in the stainless steel cavity 3 to increase the sealing property. Air inlet holes 4 are formed in two sides of the cavity, and air enters and exits through the inner air outlet holes 14.
And the stainless steel plate is fixed at the four sides of the lower part of the stainless steel sealed cavity through threads to form the electromagnetic shielding box. The BNC electric connector is fixed on the steel plates at two sides through the electrode holes 15 by screws at two sides.
The BNC electrode tip is connected with the electrode in the electrode hole 15 through a metal lead to construct a test passage at two ends.
There is a 2mm seal slot 12 at a distance of 25mm from the center. The lower cavity with the sealing ring can be directly covered, and the sealing of the cavity can be realized by screwing the bolt, so that the air tightness of the cavity is realized.
The volume of the stainless steel cavity is designed to be 16cm3The square cavity 13 can ensure that two samples can be placed at the same time, and the volume of the cavity is kept to be optimal. Four evenly distributed electrode ports 15 are arranged in the middle of the stainless steel cavity, and electrodes are respectively arranged, so that two samples can be simultaneously accessed and tested.
The lower part of the cavity is an electrical signal transmission part, and a shielding box is constructed by using stainless steel plates 8 and 9 to realize effective shielding of electromagnetic signals. The BNC connectors are respectively and evenly fixed on the BNC groove 6 of the lower steel plate by using threaded screws on the stainless steel plates on the two sides, the BNC electrodes are connected with the four testing electrodes in the stainless steel cavity through silver-plated copper wires, and the effective transmission of electric signals of the inside of the gas testing cavity and the testing instrument can be realized.
And finally, fixing four brackets on the stainless steel plate at the lower part through screws so as to support the stainless steel testing cavity.
Example 3
Before testing a sample, the tested sample is placed in the middle of a testing cavity and is connected with a testing electrode through a gold thread, then a stainless steel cover plate is fixed on the testing cavity through a threaded screw, and an upper layer stainless steel plate and the stainless steel cavity form a closed system through screwing the screw.
During testing, gas to be tested is introduced from the gas inlet hole, so that the gas can enter the testing cavity at a fixed flow rate and flow out from the gas outlet hole. At the moment, the BNC connector is used for accessing through the coaxial line and the source meter, and the input electric signal and the output electric signal are recorded to finish the test.
The gas can enter and fill the whole cavity for less than 1 second under the condition of the flow rate of 200sccm, so that the contact between the gas and a sample is realized to the maximum extent, and the testing efficiency is effectively improved.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (9)
1. The gas sensing dynamic testing device is characterized by comprising a cavity and a testing module;
the cavity is a stainless steel cavity and is divided into an upper cavity and a lower cavity, and the lower end face of the upper cavity is the upper end face of the lower cavity;
the upper cavity is provided with a cover body in sealing connection;
the side wall of the upper cavity is provided with an air inlet and an air outlet;
a sensing element to be detected is arranged in the upper cavity;
the lower end surface of the upper cavity is provided with a through hole;
the test module is fixed on the lower cavity and is electrically communicated with the sensing element to be tested through a lead;
the wire passes through the through hole.
2. The gas sensing dynamic testing device of claim 1, wherein the through-holes comprise N through-holes, wherein N is an even number.
3. The gas sensing dynamic testing apparatus of claim 2,
and the N is 4, and the N is respectively connected with 2 to-be-measured sensing elements.
4. The gas sensing dynamic testing device of claim 1, wherein the upper chamber body is a square chamber body.
5. The gas sensing dynamic testing device of claim 4, wherein the volume of the square cavity is 16-50 cm3。
6. The gas sensing dynamic testing device of claim 1, wherein the cover is a removable cover.
7. The gas sensing dynamic testing device of claim 1, wherein the testing module is a flanged electrode.
8. A method of gas sensing testing, the method comprising the steps of:
placing a sensing element to be tested in a gas sensing dynamic testing device, and inputting and outputting an electric signal through a testing module after gas to be tested is introduced to complete testing;
wherein the gas sensing dynamic test device is selected from the gas sensing dynamic test device of any one of claims 1 to 7.
9. The method of claim 8,
the flow rate of the gas to be detected is 20-800 sccm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111492599.1A CN114414629A (en) | 2021-12-08 | 2021-12-08 | Gas sensing dynamic testing device and gas sensing testing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111492599.1A CN114414629A (en) | 2021-12-08 | 2021-12-08 | Gas sensing dynamic testing device and gas sensing testing method |
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| CN114414629A true CN114414629A (en) | 2022-04-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454383A (en) * | 2013-09-05 | 2013-12-18 | 长三角(嘉兴)纳米科技产业发展研究院 | Dynamic response performance test system for gas sensor |
| CN104076122A (en) * | 2014-05-26 | 2014-10-01 | 电子科技大学 | Temperature continuously-adjustable point-contact gas-sensitive humidity-sensitive test cavity |
| US20150075258A1 (en) * | 2013-09-16 | 2015-03-19 | Lg Innotek Co., Ltd. | Gas sensor package |
| CN106226355A (en) * | 2016-07-19 | 2016-12-14 | 上海交通大学 | A kind of air-sensitive detection device and using method thereof |
| US20170052042A1 (en) * | 2015-08-17 | 2017-02-23 | Iball Instruments Llc | Parasitic Gas Detection System |
| CN113588694A (en) * | 2021-06-28 | 2021-11-02 | 宁波大学 | Small-size sealed in-situ testing device |
-
2021
- 2021-12-08 CN CN202111492599.1A patent/CN114414629A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454383A (en) * | 2013-09-05 | 2013-12-18 | 长三角(嘉兴)纳米科技产业发展研究院 | Dynamic response performance test system for gas sensor |
| US20150075258A1 (en) * | 2013-09-16 | 2015-03-19 | Lg Innotek Co., Ltd. | Gas sensor package |
| CN104076122A (en) * | 2014-05-26 | 2014-10-01 | 电子科技大学 | Temperature continuously-adjustable point-contact gas-sensitive humidity-sensitive test cavity |
| US20170052042A1 (en) * | 2015-08-17 | 2017-02-23 | Iball Instruments Llc | Parasitic Gas Detection System |
| CN106226355A (en) * | 2016-07-19 | 2016-12-14 | 上海交通大学 | A kind of air-sensitive detection device and using method thereof |
| CN113588694A (en) * | 2021-06-28 | 2021-11-02 | 宁波大学 | Small-size sealed in-situ testing device |
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