CN102830145A - Hazardous liquid test device based on capacitance monitoring - Google Patents
Hazardous liquid test device based on capacitance monitoring Download PDFInfo
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- CN102830145A CN102830145A CN201210308802XA CN201210308802A CN102830145A CN 102830145 A CN102830145 A CN 102830145A CN 201210308802X A CN201210308802X A CN 201210308802XA CN 201210308802 A CN201210308802 A CN 201210308802A CN 102830145 A CN102830145 A CN 102830145A
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Abstract
The invention relates to a hazardous liquid test device based on capacitance monitoring, and the device comprises a test electrode, a capacitance detection circuit, a power supply management module and a microprocessor, wherein the test electrode is contacted with the tested liquid; the input end of the capacitance detection circuit is connected with the output end of the test electrode; the power supply management module supplies to the capacitance detection circuit; and the input end of the microprocessor is connected with the output end of the capacitance detection circuit, and the microprocessor is connected with the power supply management module. Through the expansion application of an input/output port of the microprocessor, the parallel synchronous monitoring of multiple circuits of capacitance can be realized, and a purpose for identifying different liquid can be realized.
Description
Technical field
The present invention provides a kind of dangerous liquid proving installation, is meant a kind of dangerous liquid proving installation based on the electric capacity monitoring especially.
Background technology
Personnel are intensive in public place such as subway, airport, seem extremely important for the strick precaution of inflammable and explosive dangerous liquids such as the daily gasoline that touches easily, alcohol, acetone.At present, conventional bottling liquid detection method has following several kinds: adopt the x-ray scanning appearance through tomography technology estimation dangerous liquid, this method detection speed is slow, accuracy rate is lower; Through the identification of taste and color, this method is normally implemented through the method that lets the visitor try to drink voluntarily, and efficient is low and influence service quality.Detect pertinent instruments owing to lack dangerous liquid, most of in the world Civil Aviation Airport are all carried liquid (comprising bottled mineral water) to the passenger and have been done strict control, and the liquid band is boarded a plane thoroughly to eliminate danger.Thereby no matter still military applications is all significant for civilian in dangerous liquid pick-up unit and method research thereof quickly and accurately.
Summary of the invention
The objective of the invention is to, a kind of dangerous liquid proving installation based on the electric capacity monitoring is provided, it is a difference of utilizing the different liquids specific inductive capacity, and the capacitance through capacitance voltage change-over circuit detection different liquids reaches the purpose of differentiating different liquids.In addition, say that the present invention can realize the parallel synchronous monitoring of multichannel electric capacity through the expanded application of microprocessor I/O mouth from the angle of detection method.
The present invention provides a kind of dangerous liquid proving installation based on the electric capacity monitoring, comprising:
One test electrode, this test electrode contacts with fluid to be measured;
One capacitive detection circuit, the input end of this capacitive detection circuit is connected with the output terminal of test electrode;
One power management module, this power management module is supplied power to capacitive detection circuit;
One microprocessor, the input end of this microprocessor is connected with the output terminal of capacitive detection circuit, and this microprocessor also is connected with power management module.
Wherein capacitive detection circuit comprises:
One capacitance voltage change-over circuit;
One ADC analog to digital conversion circuit, the input end of this ADC analog to digital conversion circuit is connected with the output terminal of capacitance voltage change-over circuit;
One digital filter circuit, the input end of this digital filter circuit is connected with the output terminal of ADC analog to digital conversion circuit;
One I2C interface circuit, the input end of this I2C interface circuit is connected with the output terminal of digital filter circuit.
Wherein test electrode is metal or material with carbon element test electrode.
Wherein the capacity measurement scope of capacitive detection circuit is 0pF-204pF.
The invention has the beneficial effects as follows: it can realize accurately fast differentiating of common liq and dangerous liquid, thereby provides a cover feasible pick-up unit for the dangerous liquid of public place detects.Through the experiment contrast that various liquid such as mineral water, ethanol, gasoline are detected, find that the circuit that designs has accuracy, repeatability and stable preferably.
Description of drawings
For further specifying content of the present invention and characteristics, below in conjunction with accompanying drawing and embodiment the present invention is done a detailed description, wherein:
Fig. 1 is the structural representation that the present invention is based on the dangerous liquid proving installation of electric capacity monitoring.
Embodiment
See also shown in Figure 1ly, the present invention provides a kind of dangerous liquid proving installation based on electric capacity monitoring, comprises
One test electrode 2, a capacitive detection circuit 3, a power management module 4 and a microprocessor 5.The input end of capacitive detection circuit 3 is connected with the output terminal of test electrode 2, and wherein capacitive detection circuit 3 comprises capacitance voltage change-over circuit 31, ADC analog to digital conversion circuit 32, digital filter circuit 33, I2C interface circuit 34.Because medium induced charge that produces when extra electric field can slacken electric field, the caused electric field of liquid mediums slackens the degree difference, and the specific inductive capacity that is showed under certain condition is also different.According to the relation between electric capacity and the specific inductive capacity, to certain test electrode 2, the capacitance that different solutions shows is also different.High-precision large-range capacity measurement system that the present invention has utilized this characteristics design.
Test electrode 2 contacts with fluid to be measured 1 among Fig. 1, and this test electrode 2 is the test electrode of metal or material with carbon element; Fluid to be measured 1 can place between two battery lead plates of test electrode 2 through the noncontact mode, and this moment, test electrode can directly adopt metal electrode, if under contact conditions, use, preferably adopted carbon electrode.Capacitance voltage change-over circuit 31 utilizes switching technique to make up the charge balance circuit and measures electric capacity, and through the conversion of closed control circuit design carrying out capacitance voltage, thereby improved test accuracy; Through the applying in a flexible way of test input operational amplifier, increase the range of capacity measurement simultaneously, realized the electric capacity monitoring in 0pF to the 204pF scope, thereby realized the synchronous detection of more dangerous liquids.The input end of ADC analog to digital conversion circuit 32 is connected with the output terminal of capacitance voltage change-over circuit 31, in ADC analog-digital converter circuit 32, has improved the conversion precision through electric charge between switching, the input of balance variable voltage and the input of fixed voltage benchmark of fixed capacity; The input end of digital filter circuit 33 is connected with the output terminal of ADC analog to digital conversion circuit 32; Test result through after the analog to digital conversion is sent in the microprocessor 5 through digital filter circuit 33 and I2C interface circuit 34, through the RS232 data line electric capacity Monitoring Data is sent to host computer then.Power management module 4 is to capacitive detection circuit 3 and microprocessor 5 power supplies; The input end of microprocessor 5 is connected with the output terminal of capacitive detection circuit 3; For improving the dangerous liquid detection efficiency; Above-mentioned detection method can be optimized in the practical implementation process; Adopt many cover capacitive detection circuits, and pass through the mode of the I/O port of expansion microprocessor, realize the synchronous monitoring of multichannel electric capacity as the I2C interface.
Table 1 is for adopting 3 road capacitive detection circuits and having expanded the test result that obtains behind 2 I/O ports of microprocessor.Adopt 3 drive tests examination circuit that empty bottle, gasoline bottle, ethanol bottle and mineral water bottle have been carried out the electric capacity monitoring simultaneously; The electrode that experiment is adopted is the copper sheet metal electrode; The specific inductive capacity of air, water, ethanol and gasoline is respectively 1,81,24.3,2.0; Consider that 3 road detecting electrodes that adopted have electrode coefficient separately respectively, the electric capacity monitor value of air, water, ethanol and the gasoline that obtains through first via test circuit #1 is respectively 2.467pF, 132.558pF, 27.438pF and 4.344pF; The electric capacity monitor value of air, water, ethanol and the gasoline that obtains through second drive test examination circuit #2 is 2.711pF, 132.212pF, 27.466pF and 4.211pF respectively; The electric capacity monitor value of air, water, ethanol and the gasoline that obtains through second drive test examination circuit #2 is respectively 2.136pF, 132.986pF, 27.546pF and 4.982pF.Can find out that by above-mentioned test result the dangerous liquid detection method that this patent is realized can comparatively clearly be told air, gasoline, ethanol and common mineral water, and different circuit has consistance preferably to the test result with a kind of liquid.
Therefore; Pass through experiment test; In the practical implementation process, can think test value between between the 4-5pF by side liquid be gasoline class material, between between the 27-28pF be ethanol class material by side liquid, liquid between 132-133pF then is mineral water, through detecting capacitance; Can clearly tell common liq and dangerous liquid, carry out the accurate fast detecting that the visitor carries liquid in public places such as subway or airports.
Table 1
The above; Be merely the embodiment among the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The conversion that can expect easily or replacement all should be encompassed in of the present invention comprising within the scope.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (4)
1. dangerous liquid proving installation based on electric capacity monitoring comprises:
One test electrode, this test electrode contacts with fluid to be measured;
One capacitive detection circuit, the input end of this capacitive detection circuit is connected with the output terminal of test electrode;
One power management module, this power management module is supplied power to capacitive detection circuit;
One microprocessor, the input end of this microprocessor is connected with the output terminal of capacitive detection circuit, and this microprocessor also is connected with power management module.
2. the dangerous liquid proving installation based on the electric capacity monitoring according to claim 1, wherein capacitive detection circuit comprises:
One capacitance voltage change-over circuit;
One ADC analog to digital conversion circuit, the input end of this ADC analog to digital conversion circuit is connected with the output terminal of capacitance voltage change-over circuit;
One digital filter circuit, the input end of this digital filter circuit is connected with the output terminal of ADC analog to digital conversion circuit;
One I2C interface circuit, the input end of this I2C interface circuit is connected with the output terminal of digital filter circuit.
3. the dangerous liquid proving installation based on the electric capacity monitoring according to claim 1, wherein test electrode is metal or material with carbon element test electrode.
4. the dangerous liquid proving installation based on the electric capacity monitoring according to claim 1, wherein the capacity measurement scope of capacitive detection circuit is 0pF-204pF.
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| CN201210308802XA CN102830145A (en) | 2012-08-27 | 2012-08-27 | Hazardous liquid test device based on capacitance monitoring |
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| CN201210308802XA CN102830145A (en) | 2012-08-27 | 2012-08-27 | Hazardous liquid test device based on capacitance monitoring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675043A (en) * | 2013-12-06 | 2014-03-26 | 西安天厚电子技术有限责任公司 | Oil quality detection 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675043A (en) * | 2013-12-06 | 2014-03-26 | 西安天厚电子技术有限责任公司 | Oil quality detection 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 |
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Application publication date: 20121219 |