CN101865954A - Device and method for measuring dangerous goods in envelops based on capacitance sensor - Google Patents
Device and method for measuring dangerous goods in envelops based on capacitance sensor Download PDFInfo
- Publication number
- CN101865954A CN101865954A CN 201010204584 CN201010204584A CN101865954A CN 101865954 A CN101865954 A CN 101865954A CN 201010204584 CN201010204584 CN 201010204584 CN 201010204584 A CN201010204584 A CN 201010204584A CN 101865954 A CN101865954 A CN 101865954A
- Authority
- CN
- China
- Prior art keywords
- electrode
- capacitance
- envelope
- capacitive transducer
- adjacent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention belongs to the technical field of capacitance sensor, relating to a device for measuring dangerous goods in envelops based on a capacitance sensor, comprising a capacitance sensor constituted by an electrode array, a multi-channel analog switch, a capacitance measuring apparatus and an upper computer. The measuring method comprises the following steps: controlling the multi-channel analog switch by the upper computer to gate one of the electrodes, gating each adjacent electrodes of the electrode in sequence under two conditions, measuring the capacitance value between the electrode and each adjacent electrode according to different conditions by utilizing capacitance measuring apparatus, and judging whether dangerous goods exist between the electrode and adjacent electrodes according to the fact that whether the ratio of the difference between the calibrated capacitance and the corresponding measured capacitance to the calibrated capacitance is greater than the threshold value. The invention simultaneously provides a method for measuring dangerous goods realized by adopting the above measuring device. The invention is practical, simple and convenient, and is one of the equipment for measuring dangerous goods in envelops with the highest feasibility.
Description
Technical field
The invention belongs to technical field of capacitance sensor, relate to a kind of measurement mechanism and measuring method of dangerous goods in envelope.
Background technology
Abroad, mail has become the requisite thing of our daily life.Go to open a bank account, need mailing address, accounts information and bank card are sent you respectively by many envelope letters.Every month, various bills such as water, electricity and gas, bank are confusingly next to stepping on by mail; You can also receive that per term school is to information of discount of child's comment, online fixed cheap ticket, each supermarket and businessman or the like.Though picture is so unimportant abroad for mail at home, this mode of posting a letter still is popular.
Calendar year 2001, confirm to have the people to propagate the anthrax bacterium from the U.S. by mail, the people was proved and has infected anthrax by 18 days at least 13 October, and this is havoc again that the U.S. has suffered since September 11 attack of terrorism taking place, and had also caused the alarmed of countries in the world simultaneously.Though in these years, propagate the generation again of incident that anthrax causes the people to infect by envelope, but this has also beaten the alarm bell of anti-terrorism to us, even commonly also may be utilized, so it is significant that the instrument that the inner dangerous goods of an envelope detect is installed on letter-sorting installation by the terrorist to the envelope that is used at ordinary times posting a letter.
At present, the domestic instrument that is used for detecting dangerous goods in envelope does not specially also have, and one is that the supervisory personnel checks by seeing, touching, and ordinary mail one be unsight.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, propose a kind of dangerous goods in envelope measurement mechanism.The present invention adopts following technical scheme:
A kind of measurement mechanism of the dangerous goods in envelope based on capacitive transducer, be used to measure and have or not the metal threat object product in the envelope, comprise capacitive transducer, multiway analog switch, capacitance meter and host computer, described capacitive transducer comprises the M * N electrod-array (M that is distributed on the same plane, N is the integer more than or equal to 2), by one of them electrode of host computer control multiway analog switch gating, and each adjacent electrode of this electrode of gating successively in two kinds of situation, utilize capacitance meter branch situation to measure capacitance between this electrode and each adjacent electrode, a kind of situation is, described mail is normal mail, measures the demarcation capacitance between this electrode and each adjacent electrode; Another kind of situation is, described envelope is tested envelope, measure the measurement capacitance between this electrode and each adjacent electrode, for this electrode and its each adjacent electrode, all carry out following judgement: set an enough little threshold value, whether greater than threshold value, judge whether there are the metal threat object product between this electrode and the adjacent electrode according to the ratio of the demarcation capacitance between this electrode and the adjacent electrode and the difference of measuring capacitance and this demarcation capacitance;
As preferred implementation, dangerous goods in envelope measurement mechanism of the present invention, described capacitive transducer is made up of the electrod-array of evenly arranging, the quantity 4-40000 of electrode, electrode is to be made by sheet metal, thickness is 0.0001-1mm, and its size is decided according to the quantity of electrode and the size of tested envelope.
The present invention provides a kind of method that adopts above-mentioned measurement mechanism to measure dangerous goods in envelope simultaneously, comprises the following steps:
(1) capacitive transducer is placed on the sorting equipment,
(2) normal mail is passed through this capacitive transducer, when an end of analog switch is chosen one of them electrode of capacitive transducer, utilize host computer to control analog switch, the other end that makes analog switch is the gating electrode adjacent with this electrode successively, utilize capacitance meter to measure each respectively and demarcate capacitance, and send into host computer;
(3) for tested mail, using the same method records corresponding each measurement capacitance, and sends into host computer;
(4) certain that judge this electrode demarcate capacitance and and corresponding measurement capacitance between the ratio of difference and this demarcations capacitance whether greater than threshold value, as if greater than threshold value, then judge this electrode and have the metal threat object product between the adjacent electrode accordingly;
(5) for every pair of adjacent electrode repeating step (2) of capacitive transducer to (4).
The apparatus and method that the present invention proposes are utilized the capacitive transducer that is made of capacitor array, by the comparison of measuring electric capacity and demarcating electric capacity, realize the fast detecting of metal threat object product in the envelope.Comparatively practical, simple, convenient, be one of testing tool of the most feasible dangerous goods in envelope.
Description of drawings
Fig. 1 is the measuring system apparatus structure block diagram of the dangerous goods in envelope based on capacitive transducer of the present invention;
Fig. 2 is the synoptic diagram that is distributed in 3 * 3 electrod-array capacitive transducers on the same plane.
Specific implementation method
Fig. 1 is the measurement mechanism structured flowchart that draws according to one embodiment of the invention.It is made of capacitive transducer 1, multiway analog switch 2, capacitance meter 3 and 4 four major parts of host computer.
Capacitive transducer 1 is M * N electrod-array (M, N is the integer more than or equal to 2), the quantity of the electrode that is comprised can be 4-40000, each electrode is all in the same plane, each electrode is made by titanium alloy, thickness is 0.01-1mm, and its size is determined according to the quantity and the tested envelope-sized of electrode.For example among Fig. 1,2 * 2 totally 4 electrodes are arranged, then size can be 40mm * 25mm.According to the size of tested envelope, and rational number of electrodes, make electrode be distributed in whole envelope uniformly, utilize the very thin epoxy resin of one deck that electrode is sealed.
For tested mail, the measurement capacitance that records this electrode and other three adjacent electrodes that uses the same method is C1, C2, C3, by the usb data line 3 capacitances are imported host computers 4, host computer 4 by C01-C1 and C01 whether consistent judge have or not dangerous goods in the envelope.During judgement, default threshold values, this threshold value can be obtained by experiment, and as 0.01, might as well get first pair of electrode is example, when
During greater than threshold values, between this electrode the metal threat object product are arranged in the envelope, when
Less than threshold values, approaching more zero, illustrate then between this electrode of envelope and have only paper that like this, host computer 4 can judge that by calculating the ratio between each adjacent electrode envelope inside has or not the hazardous metals article.
3 * 3 electrod-array capacitive transducers that Fig. 2 can adopt for the present invention, the adjacent electrode of electrode 25 are other 8 electrodes, and the adjacent electrode of electrode 21 is an electrode 22,24,25.Line space between the adjacent electrode equates that column pitch also equates.
The electric current bearing value of analog switch 2 should be between the 10mA to 1A.Analog switch 2 adopts the high-current switch chip (as MAX4656) of MAXIUM company.
Measuring method specifically may further comprise the steps:
(1) this type of capacitive transducer is placed on the sorting equipment, earlier normal mail is passed through this capacitive transducer, when an end of analog switch 2 is chosen capacitive transducer 1 one of them electrode, utilize host computer 4 to control analog switch 2, the other end that makes analog switch 2 is the gating electrode adjacent with this electrode successively, utilize capacitance meter 3 to measure its capacitance respectively, for example among Fig. 1, supposing to record the demarcation capacitance is C01, C02, C03, by the usb data line 3 capacitances are imported host computer 4, as calibration value.
(2) for tested mail, using the same method and recording the measurement capacitance is C1, C2, C3, by the usb data line 3 capacitances is imported host computers 4;
(3) might as well get first pair of electrode is example, host computer 4 by C01-C1 and C01 whether consistent judge have or not dangerous goods in the envelope.During judgement, default threshold values, as 0.01, when
During greater than threshold values, between this electrode the metal threat object product are arranged in the envelope, when
Less than threshold values, approaching more zero, illustrate then between this electrode of envelope and have only paper that like this, host computer 4 can judge that by calculating the ratio between each adjacent electrode envelope inside has or not the hazardous metals article.
Claims (3)
1. measurement mechanism based on the dangerous goods in envelope of capacitive transducer, be used to measure and have or not the metal threat object product in the envelope, comprise capacitive transducer, multiway analog switch, capacitance meter and host computer, it is characterized in that, described capacitive transducer comprises the M * N electrod-array (M that is distributed on the same plane, N is the integer more than or equal to 2), by one of them electrode of host computer control multiway analog switch gating, and each adjacent electrode of this electrode of gating successively in two kinds of situation, utilize capacitance meter branch situation to measure capacitance between this electrode and each adjacent electrode, a kind of situation is, described mail is normal mail, measures the demarcation capacitance between this electrode and each adjacent electrode; Another kind of situation is, described envelope is tested envelope, measure the measurement capacitance between this electrode and each adjacent electrode, for this electrode and its each adjacent electrode, all carry out following judgement: set an enough little threshold value, whether greater than threshold value, judge whether there are the metal threat object product between this electrode and the adjacent electrode according to the ratio of the demarcation capacitance between this electrode and the adjacent electrode and the difference of measuring capacitance and this demarcation capacitance.
2. the dangerous goods in envelope measurement mechanism of capacitive transducer according to claim 1, it is characterized in that, described capacitive transducer is made up of the electrod-array of evenly arranging, the quantity 4-40000 of electrode, electrode is to be made by sheet metal, thickness is 0.0001-1mm, and its size is decided according to the quantity of electrode and the size of tested envelope.
3. a method that adopts the described measurement mechanism of claim 1 to measure dangerous goods in envelope comprises the following steps:
(1) capacitive transducer is placed on the sorting equipment,
(2) normal mail is passed through this capacitive transducer, when an end of analog switch is chosen one of them electrode of capacitive transducer, utilize host computer to control analog switch, the other end that makes analog switch is the gating electrode adjacent with this electrode successively, utilize capacitance meter to measure each respectively and demarcate capacitance, and send into host computer;
(3) for tested mail, using the same method records corresponding each measurement capacitance, and sends into host computer;
(4) certain that judge this electrode demarcate capacitance and and corresponding measurement capacitance between the ratio of difference and this demarcations capacitance whether greater than threshold value, as if greater than threshold value, then judge this electrode and have the metal threat object product between the adjacent electrode accordingly;
(5) for every pair of adjacent electrode repeating step (2) of capacitive transducer to (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102045846A CN101865954B (en) | 2010-06-21 | 2010-06-21 | Device and method for measuring dangerous goods in envelops based on capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102045846A CN101865954B (en) | 2010-06-21 | 2010-06-21 | Device and method for measuring dangerous goods in envelops based on capacitance sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101865954A true CN101865954A (en) | 2010-10-20 |
| CN101865954B CN101865954B (en) | 2012-11-14 |
Family
ID=42957755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102045846A Expired - Fee Related CN101865954B (en) | 2010-06-21 | 2010-06-21 | Device and method for measuring dangerous goods in envelops based on capacitance sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101865954B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3041026B2 (en) * | 1990-09-07 | 2000-05-15 | アンリツ株式会社 | Metal detector |
| US6168080B1 (en) * | 1997-04-17 | 2001-01-02 | Translucent Technologies, Llc | Capacitive method and apparatus for accessing contents of envelopes and other similarly concealed information |
| JP2008039394A (en) * | 2004-11-29 | 2008-02-21 | Univ Nihon | Electromagnetic-induction sensor for metal detector |
| CN201392335Y (en) * | 2009-04-17 | 2010-01-27 | 北京博创兴盛机器人技术有限公司 | Dangerous liquid detector |
-
2010
- 2010-06-21 CN CN2010102045846A patent/CN101865954B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3041026B2 (en) * | 1990-09-07 | 2000-05-15 | アンリツ株式会社 | Metal detector |
| US6168080B1 (en) * | 1997-04-17 | 2001-01-02 | Translucent Technologies, Llc | Capacitive method and apparatus for accessing contents of envelopes and other similarly concealed information |
| JP2008039394A (en) * | 2004-11-29 | 2008-02-21 | Univ Nihon | Electromagnetic-induction sensor for metal detector |
| CN201392335Y (en) * | 2009-04-17 | 2010-01-27 | 北京博创兴盛机器人技术有限公司 | Dangerous liquid detector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101865954B (en) | 2012-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103528493B (en) | A kind of printed circuit board stress-strain test system | |
| CN204666549U (en) | Based on the mixed gas detection system of BP neural network | |
| CN104422816B (en) | Residual current detection method and apparatus | |
| CN100451572C (en) | Liquid-level detecting method of conductive liquid and system | |
| CN102680499A (en) | Sensor and method for detecting salinity based on micro-electromechanical system (MEMS) technology | |
| CN106017625A (en) | Method for detecting quantity of grain in grain bin, and pressure sensor | |
| CN101865954B (en) | Device and method for measuring dangerous goods in envelops based on capacitance sensor | |
| CN101866016B (en) | Imaging device and detection method of dangerous goods in envelope | |
| CN203275352U (en) | Heavy metal ion detector | |
| CN210720230U (en) | Lubricating oil detection sensor | |
| CN202748338U (en) | Portable water quality analyzer | |
| CN205450079U (en) | Wind generating set's thunder current measuring device | |
| CN204028346U (en) | A kind of electric energy meter Auto-Test System | |
| Yan et al. | An electrode polarization impedance based flow sensor for low water flow measurement | |
| CN202083657U (en) | Revision and addition writing discriminating instrument for black writing | |
| CN101806877A (en) | Intelligent electricity consumption analyzer | |
| CN102052951B (en) | Measurement device and method for multi-phase interface liquid level based on dual-modality sensor | |
| CN107356816A (en) | A kind of capacitive equipment dielectric loss on-line checking table | |
| CN103616057A (en) | Method and device for measuring level of water in non-metal container or pipeline | |
| CN204007984U (en) | Slight pressure measurement mechanism | |
| CN202092715U (en) | Digital liquid level meter for remote monitoring | |
| CN203216826U (en) | Periodic wheel immersion corrosion testing device | |
| CN106197669A (en) | A kind of employing color sensor remote reading systems | |
| CN202305075U (en) | Non-contact torque sensor | |
| CN104950018A (en) | Mixed gas detecting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20121114 Termination date: 20210621 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |