CN202330346U - Improved capacitance sensor for security detection on liquid prohibited products - Google Patents
Improved capacitance sensor for security detection on liquid prohibited products Download PDFInfo
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- CN202330346U CN202330346U CN2011204540890U CN201120454089U CN202330346U CN 202330346 U CN202330346 U CN 202330346U CN 2011204540890 U CN2011204540890 U CN 2011204540890U CN 201120454089 U CN201120454089 U CN 201120454089U CN 202330346 U CN202330346 U CN 202330346U
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- 239000000758 substrate Substances 0.000 claims abstract description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 8
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
本实用新型公开了一种用于液体违禁品安全检测的改进型电容传感器，其特征在于，包括一基板，所述基板的正面设置有一激励电极和若干接收电极，基板的反面设置有屏蔽电极。所述基板为环氧树脂-玻璃纤维基覆铜板，基板的外围设置有屏蔽罩。基板的反面整面覆铜，铜表面设置有绝缘层。基板的正面设置有与反面材质厚度相同的绝缘层。本实用新型的有益效果在于：结构简单，设计巧妙，探测灵敏度较高，在不开瓶取样的情况下，有效鉴别出在厚度为4mm以下的非金属容器中浓度50％以上的酒精和水，可以用于非接触式液体违禁品快速检测。
The utility model discloses an improved capacitive sensor for safety detection of contraband liquids, which is characterized in that it comprises a substrate, an excitation electrode and a plurality of receiving electrodes are arranged on the front of the substrate, and shielding electrodes are arranged on the back of the substrate. The substrate is an epoxy resin-glass fiber-based copper-clad board, and a shielding cover is arranged on the periphery of the substrate. Copper is covered on the entire reverse surface of the substrate, and an insulating layer is arranged on the copper surface. The front side of the substrate is provided with an insulating layer having the same thickness as the material thickness of the back side. The utility model has the beneficial effects of simple structure, ingenious design, high detection sensitivity, and can effectively identify alcohol and water with a concentration of more than 50% in a non-metallic container with a thickness of 4 mm or less without opening the bottle for sampling. It can be used for rapid detection of non-contact liquid contraband.
Description
Technical field
The utility model relates to public safety field, a kind of modified capacitive transducer that is used for liquid contraband goods safety detection.
Background technology
The invention of liquid explosive and combustible and use have had quite long history, but Yin Weili is strong not as solid explosive, and it uses in fields such as military affairs is not very general.But terrorist and lawless person utilize its low in raw material cost in recent years, be prone to obtain, manufacturing step disguises oneself as common beverages or commodity simply, easily, easy characteristics of igniting; As the various types of attacks of terrorism or the instrument of disturbing public order, serious threat public security and social stability.At present commonplace liquid contraband goods somascope is generally based on following several kinds of technology: static x-ray tomography technology, microwave irradiation technology, Raman spectrum, gas chromatography etc.; These methods can accomplish effectively that contraband goods detects or early warning, but also exist different shortcomings simultaneously: as have radiation hazard, can't overcome container shapes and wall thickness to influence, the analysis time of testing result long environment, the volume that is inappropriate for quick security check big, price is high, False Rate is high.
Utilize quasistatic capacitance chromatographic technology under the situation of not opening external packing, to detect whether liquid is contraband goods in the nonmetallic vessel.The core of this technology is to measure liquid dielectric.Specific inductive capacity can reflect the character of liquid, and common liqs such as the specific inductive capacity of dangerous liquid material and water differ greatly.Therefore utilize quasistatic capacitance chromatographic commercial measurement specific inductive capacity, can judge the liquid of surveying whether be the liquid contraband goods.Because be pure electronic surveying, radiationless harm, and be easy to realize miniaturization.This technology is identical with the ultimate principle of the ECT that is applied to fields such as petroleum refining, food, papermaking (capacitance chromatographic technology).Can know that by C=ε S/4 π kd under the situation about confirming apart from d and useful area S of capacitor plate, specific inductive capacity is directly proportional with capacitance, therefore can calculate specific inductive capacity through the measurement capacitance.Liquid contraband goods testing fixture based on quasistatic capacitance chromatographic technology just is being based on this principle.
The utility model content
The purpose of the utility model is to provide a kind of modified capacitive transducer that is used for liquid contraband goods safety detection, in conjunction with traditional parallel-plate electrode and the advantage of dressing electrode, thereby realizes the purpose of the utility model.
The technical matters that the utility model solved can adopt following technical scheme to realize:
A kind of modified capacitive transducer that is used for liquid contraband goods safety detection; It is characterized in that, comprise a substrate, the front of said substrate is provided with two row's electrodes; Any electrode in two row's electrodes is set to exciting electrode, and other electrode is set to receiving electrode; The reverse side of substrate is provided with guarded electrode; Said receiving electrode is through connecting single-chip microcomputer.
In an embodiment of the utility model, said substrate is epoxy resin-fiberglass-based copper-clad plate, and its electric constant nominal value is 4.7.
In an embodiment of the utility model, the outer periphery of said substrate is equipped with radome.
In an embodiment of the utility model, the whole face of the reverse side of said substrate covers copper, and the copper surface is provided with insulation course.
In an embodiment of the utility model, the front of said substrate is provided with and the identical insulation course of reverse side material thickness.
The beneficial effect of the utility model is: simple in structure; Design ingeniously, detection sensitivity is higher, under the situation of not uncork sampling; Effectively identifying at thickness is alcohol and the water of concentration more than 50% in the nonmetallic vessel below the 4mm, can be used for contactless liquid contraband goods fast detecting.
Description of drawings
Fig. 1 is the structural representation of the described modified capacitive transducer of the utility model.
Fig. 2 is the measurement result of different liquids under different electrodes.
Fig. 3 is the measurement result of alcohol under different electrodes of different component.
Fig. 4 is the measurement result of different vessels under the A electrode.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with embodiment, further set forth the utility model.
As shown in Figure 1; The described a kind of modified capacitive transducer that is used for liquid contraband goods safety detection of the utility model; Comprise a substrate 100; The front of said substrate 100 is provided with two row's electrodes, and any electrode in two row's electrodes is set to exciting electrode 110, and other electrode is set to receiving electrode 120; The reverse side of substrate 100 is provided with guarded electrode; Said receiving electrode connects single-chip microcomputer 130 through serial communication bus.Said substrate 100 is epoxy resin-fiberglass-based copper-clad plate, and the outer periphery of substrate 100 is equipped with radome 140.The whole face of the reverse side of substrate 100 covers copper, and the copper surface is provided with insulation course.The front of substrate 100 is provided with and the identical insulation course of reverse side material thickness.
Use height greater than glass container all electrode height, wall thickness 1mm, fill with gasoline, acetone, alcohol and water respectively and measure with different electrodes.The specific inductive capacity of several kinds of liquid is as shown in table 1 under 25 degrees centigrade:
The specific inductive capacity of 25 ℃ of several kinds of liquid of table 1
If we place passage 1 with the channel selecting end, passage 1 is just as exciting electrode so, and other several electrodes have been exactly receiving electrode.Read test result, represent with broken line graph.Might as well select No. 2 pole plates in every group of electrode to compare, as shown in Figure 2.
Compare B and C two arrays of electrodes, the two-plate spacing is little in the B electrode, measures numerical value and is significantly less than C, and the capacitance of also promptly measuring is obviously greater than C, and is theoretical identical with aforesaid penetration depth and polar plate spacing.Relatively B and E two arrays of electrodes can be seen the influence of electrode width to measurement result, and the wide more measurement electric capacity of electrode is big more, and sensitivity just is high more.
Compare B and A two arrays of electrodes, the A electrode is when substance dielectric constant changes, and its measurement result rate of change is higher, and it is higher to be reflected as two groups of broken line slopes between the material among the figure, and therefore the most obvious to the differentiation of object, sensitivity is the highest.
According to the mixture dielectric constant formula: (P1 and P2 are the solute volume fraction to ε=ε 1 * P1+ ε 2 * P2; ε 1 and the specific inductive capacity of ε 2 for corresponding solute) 50% the alcohol specific inductive capacity of being easy to get is 51.4; Between dangerous material and safe liquid, that it is more strict as separation in table 1.If this electrode can accurately distinguish 50% alcohol and water then this electrode sensitivity has reached higher level.Therefore we have carried out one group of experiment to the alcohol of different component.Container is changed to vial.
Comparison diagram 3 data can see that the sensitivity of C and D two arrays of electrodes is relatively poor, 50% and 70% alcohol can not distinguish, and other electrode all can separate by active zone, and A electrode best results.
After the design of having accomplished capacitor plate, capacitive transducer pole plate performance parameter is analyzed, comprise that sensor is for the influence to measurement result of container maximum probe wall thickness, different capabilities, air gap.Experiment is that 80 milliliters and 150 milliliters, wall thickness are that 1～4 millimeter, maximum air gap are to carry out under 5 millimeters the situation at capacity mainly.Measurement result is as shown in Figure 4.
Experiment showed, that it is 80ml that this size capacitive transducer pole plate can satisfy at minimum capacity, the measurement under the largest container wall thickness 4.06mm situation, its maximum detectable range is about 5mm, adheres to specification basically.
More than show and described ultimate principle of the utility model and the advantage of principal character and the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.
Claims (5)
1. modified capacitive transducer that is used for liquid contraband goods safety detection; It is characterized in that, comprise a substrate, the front of said substrate is provided with two row's electrodes; Any electrode in two row's electrodes is set to exciting electrode, and other electrode is set to receiving electrode; The reverse side of substrate is provided with guarded electrode; Said receiving electrode connects single-chip microcomputer.
2. the modified capacitive transducer that is used for liquid contraband goods safety detection according to claim 1 is characterized in that, said substrate is epoxy resin-fiberglass-based copper-clad plate, and its electric constant nominal value is 4.7.
3. the modified capacitive transducer that is used for liquid contraband goods safety detection according to claim 1 is characterized in that the outer periphery of said substrate is equipped with radome.
4. the modified capacitive transducer that is used for liquid contraband goods safety detection according to claim 1 is characterized in that the whole face of the reverse side of said substrate covers copper, and the copper surface is provided with insulation course.
5. according to claim 1 or the 4 described modified capacitive transducers that are used for liquid contraband goods safety detection, it is characterized in that the front of said substrate is provided with and the identical insulation course of reverse side material thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204540890U CN202330346U (en) | 2011-11-16 | 2011-11-16 | Improved capacitance sensor for security detection on liquid prohibited products |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204540890U CN202330346U (en) | 2011-11-16 | 2011-11-16 | Improved capacitance sensor for security detection on liquid prohibited products |
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| CN202330346U true CN202330346U (en) | 2012-07-11 |
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| CN2011204540890U Expired - Fee Related CN202330346U (en) | 2011-11-16 | 2011-11-16 | Improved capacitance sensor for security detection on liquid prohibited products |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830145A (en) * | 2012-08-27 | 2012-12-19 | 中国科学院半导体研究所 | Hazardous liquid test device based on capacitance monitoring |
| CN103439374A (en) * | 2013-08-23 | 2013-12-11 | 华北电力大学 | Combined printing circuit board electric capacitance tomography sensor |
| CN103439375A (en) * | 2013-08-23 | 2013-12-11 | 华北电力大学 | Integrated type capacitance-ultrasound tomography sensor |
| CN110006960A (en) * | 2018-01-05 | 2019-07-12 | 张家港万众一芯生物科技有限公司 | Dangerous liquid detection device and detection method based on flexible self-adaptation type interdigital capacitor |
| CN110989007A (en) * | 2019-12-24 | 2020-04-10 | 中控智慧科技股份有限公司 | Security door |
-
2011
- 2011-11-16 CN CN2011204540890U patent/CN202330346U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830145A (en) * | 2012-08-27 | 2012-12-19 | 中国科学院半导体研究所 | Hazardous liquid test device based on capacitance monitoring |
| CN103439374A (en) * | 2013-08-23 | 2013-12-11 | 华北电力大学 | Combined printing circuit board electric capacitance tomography sensor |
| CN103439375A (en) * | 2013-08-23 | 2013-12-11 | 华北电力大学 | Integrated type capacitance-ultrasound tomography sensor |
| CN103439374B (en) * | 2013-08-23 | 2015-10-21 | 华北电力大学 | A kind of combined printed circuit board capacitance tomography sensor |
| CN110006960A (en) * | 2018-01-05 | 2019-07-12 | 张家港万众一芯生物科技有限公司 | Dangerous liquid detection device and detection method based on flexible self-adaptation type interdigital capacitor |
| CN110989007A (en) * | 2019-12-24 | 2020-04-10 | 中控智慧科技股份有限公司 | Security door |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20161116 |
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| CF01 | Termination of patent right due to non-payment of annual fee |