CN201622355U - Metal detection door - Google Patents
Metal detection door Download PDFInfo
- Publication number
- CN201622355U CN201622355U CN2010201575874U CN201020157587U CN201622355U CN 201622355 U CN201622355 U CN 201622355U CN 2010201575874 U CN2010201575874 U CN 2010201575874U CN 201020157587 U CN201020157587 U CN 201020157587U CN 201622355 U CN201622355 U CN 201622355U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- differential amplifier
- metal detection
- detection door
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
The utility model discloses a metal detection door, which comprises a signal generation device and a signal detection device. The signal generation device comprises a transmitting coil, an amplifying circuit and an oscillator signal circuit, the signal detection device comprises a detection coil, an alternating current amplifying circuit, a true RMS conversion circuit, a differential amplifier, a window comparator and a single chip microcomputer, the amplifying circuit is connected with the oscillator signal circuit, the true RMS conversion circuit and the differential amplifier are mainly used for converting true effective values of alternating signals into direct current signals convenient for processing, a pulse signal is obtained from an output end of the differential amplifier, and after passing through the window comparator, the changed signal is converted into a digital signal. The metal detection door increases anti-interference capacity of a system, and can lead the system to be operated stably.
Description
Technical field
The utility model relates to a kind of metal detection door.
Background technology
The seventies in 20th century is along with aircraft industry develops rapidly, the make aviation and the airport security of airplane hijacking and hazard event come into one's own gradually, so in the numerous equipment in airport, metal detection door playing the part of investigate prohibited items the key player equally in the seventies in 20th century, because metal detection door is shown up prominently in airport security, begins to enable metal detection door in the safeguarding work of the megaevent such as the Olympic Games, exhibition and government's important department as requisite safety check instrument.
At present, detector gate field at home, external product has accounted for greatly.Home products is compared with external product also has certain technological gap.Be mainly reflected in and fail to report and report by mistake.Failing to report is because sensitivity does not reach, and wrong report is because antijamming capability is relatively poor.And external product has very big advantage in this respect, and therefore government bodies, enterprise, large-scale activity organizer tend to buy external product greatly.The advantage of weighing a detector gate also has some other technical feature except reporting by mistake and failing to report two important indicators, also is the important parameter of weighing a detector gate quality quality.A high performance detector gate should have following technical indicator:
1 accurately locatees: the position of accurate localization lamp display-object thing directly perceived is arranged in the both sides of door, and handled easily the person further check.
2 modular design: a detector gate mainly comprises control system, emission coefficient and receiving system.These several parts are made module, and not only dress gets up very conveniently, and breaks down and also is easy to get rid of, and the mode that can use assembly to replace makes problem obtain very soon determining.
3 self-diagnosing functions: the built-in autodiagnosis program of detector gate during start, can if problem can provide miscue at once, help operating personnel and maintenance personal's queueing problem to the self check of detector gate hardware and software.
4 microprocessor technologys make the systems control division branch that qualitative leap arranged, and have alleviated the weight of whole detector gate, and control gets up more flexibly, just can be provided with program and sensitivity easily by control panel now.
5 prevent two kinds of metals induction cancel functions: because the detection principle of detector gate be have metal object by the time caused that original changes of magnetic field is detected.But the induced field that exists dissimilar metals to produce may be cancelled out each other.Detector gate must be taked special technique and prevent this from occurring.
The design of 6 compound circuits, infrared facility: adopt this design, can strengthen the antijamming capability of detector gate greatly, infrared facility can be added up the number by detector gate simultaneously.
7 sensitivity are adjustable: can reach the safety check requirement by regulating sensitivity, but too high sensitivity meeting reduces antijamming capability.
8 cryptoguard settings: have only input correct password ability reprogramming and sensitivity, and other parameter is provided with.
9 wave filters: can be provided with and shield the electromagnetic wave that surrounding environment is disturbed by adjusting this, make detector gate be operated in steady state (SS).
10 sensitivity automatic setting functions: analyze measured object automatically and be in which range of sensitivity, just can be detected, be provided with for operating personnel thereby provide a suitable sensitivity numerical value.
At present up-to-date metal detection mainly are made up of with input two parts the signal emission, as shown in Figure 1, its signal emission part comprises RC oscillation signal generator and transmitting coil, acquisition of signal part by detecting coil, exchange amplify it, peak detection, AD conversion, warning system and demonstration are formed.When not having metal close, the amplitude of the induced signal of detecting coil does not change, and then by wave detector, the peak value that the AD sampling obtains is changeless.Thereby there is not alerting signal to export.When having metal close around the coil, the secondary induced signal that produces on metal is influential to the output of the induced signal of detecting coil.Thereby obtain the signal of an amplitude of variation, behind peak detector, the amplitude that obtains by AD sampling and original inequality, thus produce a warning.
For existing this metal detection system, if around when certain undesired signal is arranged, or during vibrations, the signal amplitude that sampling obtains through AD can change, thereby can produce wrong report.
Summary of the invention
For solving above-mentioned middle problem and the defective that exists, the utility model provides a kind of metal detection door.Described technical scheme is as follows:
A kind of metal detection door comprises:
Comprise signal generation apparatus and signal detecting device, described signal generation apparatus comprises transmitting coil and oscillator signal circuit, described signal detecting device comprises detecting coil, ac amplifier circuit, warning device and display device, it is characterized in that, described signal generation apparatus also comprises an amplifying circuit, and this amplifying circuit links to each other with described oscillator signal circuit, and described oscillator signal circuit sine wave output signal connects the amplifying circuit amplification and outputs to transmitting coil; Described signal detecting device also comprises real effective change-over circuit, differential amplifier and window comparator, described ac amplifier circuit input sine wave signal is to the real effective change-over circuit, the direct current signal of described real effective output is connected to differential amplifier, described differential amplifier output pulse signal is connected to window comparator, described window comparator output digital signal is to a single-chip microcomputer, and digital controlled signal exported by this and single-chip microcomputer and sensitivity signal is connected to display device and warning device.
The beneficial effect of the technical scheme that the utility model provides is:
Real effective circuit, differential amplifier and window comparator by its setting, the simulating signal variation that its metal is caused converts digital signal to, its digital signal that obtains can be handled by single-chip microcomputer easily, improved the antijamming capability of filtration efficiency and system, can make system carry out stable work; And this utility model also greatly reduces the cost of system.
Description of drawings
Fig. 1 is the prior art structural representation;
Fig. 2 is an one-piece construction synoptic diagram of the present utility model;
Fig. 3 is a multi-harmonic-oscillations signal circuit structural representation;
Fig. 4 is a real effective converting circuit structure synoptic diagram;
Fig. 5 is the differential amplifier circuit structural representation.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model embodiment is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 2, showed one-piece construction of the present utility model, comprised signal generation apparatus and signal detecting device, signal generation apparatus and signal detecting device are mutually independent.Signal generation apparatus comprises transmitting coil, amplifying circuit and multi-harmonic-oscillations signal circuit; Signal detecting device comprises detecting coil, ac amplifier circuit, real effective change-over circuit, differential amplifier, window comparator and single-chip microcomputer.Wherein multi-harmonic-oscillations signal circuit sine wave output signal, and this sine wave signal outputs to transmitting coil after amplifying through amplifying circuit.Detecting coil detects and outputs to ac amplifier circuit after the induced signal and amplify, then through realize the inducting conversion of direct current signal of sinusoidal signal and corresponding effective value of real effective change-over circuit, when metal is close, direct current signal has the variation of a moment, output terminal at differential amplifier will obtain a pulse signal, behind window comparator, the signal that changes is changed into digital signal, detect and trigger by Single Chip Microcomputer (SCM) system and report to the police and demonstration.Adopt window comparator mainly to be herein because the magnetic permeability of every kind of metal has nothing in common with each other, thereby the pulse signal of differential output have positive and negative branch.Obtaining through experiment, the peak change that the sensitivity of total system can reach 0.1mV will cause the pulse of differential amplifier output 10mV.That is to say that the range sensing door can well detect one piece of annular pin in the 40cm place on one side.
Be illustrated in figure 3 as multi-harmonic-oscillations signal circuit structure, adopt Wen's bridge sine-wave generator to produce the sine wave signal of a 9KHz.C27, R13 and C28, R14 are two arms of Wen's bridge, constitute positive-feedback circuit; Resistance R 11, R12 and R5 constitute negative-feedback circuit; Oscillating condition: C27=C28, R13=R14 and R5 〉=2* (R11+R12).Its frequency f=1/ (R13*C27*2 π).The design utilizes the non-linear auto_steady amplitude of realizing sine-wave generator of diode forward volt-ampere characteristic.In the circuit and four diodes and two voltage stabilizing diodes form an active leveling circuit.Carry out power amplification through TDA2030 then, export good sine wave signal and be loaded into transmitting coil.
Be illustrated in figure 4 as the real effective change-over circuit, the conversion of the direct current signal of realize inducting sinusoidal signal and corresponding effective value.This figure is the two-stage Sallen-Key filtering circuit application scheme of AD637.Form by real effective chip AD637 and capacitor C 29, C31, R7, R9, C33 peripheral circuit.The induced signal of alternation is imported through capacitance C27 through after amplifying, and exports direct current signal at 14 pin of AD637 then.Its input signal amplitude is Vo=Um √ 2/2 with the voltage relationship of output effective value, capacitor C 31, the inner common two-stage Sallen-Key filtering circuit of forming of C33 and resistance R 9, R7 and AD637.Its effect is the Alternating Component in the filtering output dc voltage signal.
Be illustrated in figure 5 as differential amplifier circuit, wherein R13, C35 and R14, C37 constitute differential integrating circuit.Its effect is that the slower direct current signal of conversion is suppressed, and the fast signal of conversion is amplified 100 times.
A, static analysis
When Vin was a slow direct current signal, (t1=R13*C35=10ms, t2=R14*C37=200ms) C35 and C37 equivalence were ineffective because differential integrating circuit time constant is less.Then this amplifier is a common differential amplification, because the circuit height symmetry, so Vo=0.
B, performance analysis
As shown in the figure,
V1＝Vin*(1-e-t/t1)，
V2＝Vin*(1-e-t/t2)，
Then,
Vo＝R23(V2-V1)/R17＝100Vin(e-t1-e-t2) (1-1)
Wherein V1 and V2 are two differential input signals of differential amplifier.
When Vin is that fluctuating signal is, and a variable signal Δ V is arranged on the basis of original input signal.Because the t2 time is longer, the V2 Vin that remains unchanged substantially then, and V1=Vin+ Δ V.Then get Vo=100 Δ V by formula (1-1).
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (4)
1. metal detection door, comprise signal generation apparatus and signal detecting device, described signal generation apparatus comprises transmitting coil and oscillator signal circuit, described signal detecting device comprises detecting coil, ac amplifier circuit, warning device and display device, it is characterized in that, described signal generation apparatus also comprises an amplifying circuit, and this amplifying circuit links to each other with described oscillator signal circuit, and described oscillator signal circuit sine wave output signal connects amplifying circuit and amplifies and output to transmitting coil; Described signal detecting device also comprises real effective change-over circuit, differential amplifier and window comparator, described ac amplifier circuit input sine wave signal is to the real effective change-over circuit, the direct current signal of described real effective output is connected to differential amplifier, described differential amplifier output pulse signal is connected to window comparator, described window comparator output digital signal is to a single-chip microcomputer, and digital controlled signal exported by this and single-chip microcomputer and sensitivity signal is connected to display device and warning device.
2. metal detection door according to claim 1, it is characterized in that, described oscillator signal circuit is the multi-harmonic-oscillations signal circuit, and this multi-harmonic-oscillations signal circuit comprises an active leveling circuit, and this active leveling circuit comprises four diodes and two voltage stabilizing diodes.
3. metal detection door according to claim 1 is characterized in that, described real effective change-over circuit comprises a filtering circuit, and this filtering circuit is made of effective value chip AD637, electric capacity and peripheral component.
4. metal detection door according to claim 1 is characterized in that, described differential amplifier comprises that a pair of direct current signal suppresses and the differential integrating circuit that amplifies, and this differential integrating circuit is made of electric capacity and resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201575874U CN201622355U (en) | 2010-04-14 | 2010-04-14 | Metal detection door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201575874U CN201622355U (en) | 2010-04-14 | 2010-04-14 | Metal detection door |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201622355U true CN201622355U (en) | 2010-11-03 |
Family
ID=43025814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201575874U Expired - Fee Related CN201622355U (en) | 2010-04-14 | 2010-04-14 | Metal detection door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201622355U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346262A (en) * | 2011-09-19 | 2012-02-08 | 广东守门神电子科技有限公司 | Detection door passing method and system |
| CN102608199A (en) * | 2012-03-06 | 2012-07-25 | 南昌航空大学 | Signal conditioning circuit of ACFM (Alternating Current Field Measurement) digital detector |
| CN102997770A (en) * | 2012-10-31 | 2013-03-27 | 江西理工大学 | Underground signal generating device for detecting and identifying blind shot for blasting chamber |
| CN105353417A (en) * | 2015-09-28 | 2016-02-24 | 芜湖市恒峰科技有限公司 | Low-power detection circuit of underground metal pipeline |
| CN105607148A (en) * | 2015-12-18 | 2016-05-25 | 北京航星机器制造有限公司 | Safety-check door parameter intelligent setting method |
| CN106504471A (en) * | 2016-10-27 | 2017-03-15 | 南京理工大学 | A kind of nearly electricity early warning system of motor vehicles and machines |
| CN109073773A (en) * | 2016-02-15 | 2018-12-21 | 梅特拉森斯有限公司 | The improvement of magnetic detector |
| CN113625351A (en) * | 2021-08-17 | 2021-11-09 | 上海亨临光电科技有限公司 | Method for feeding back voltage value of detector channel |
-
2010
- 2010-04-14 CN CN2010201575874U patent/CN201622355U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346262A (en) * | 2011-09-19 | 2012-02-08 | 广东守门神电子科技有限公司 | Detection door passing method and system |
| CN102608199A (en) * | 2012-03-06 | 2012-07-25 | 南昌航空大学 | Signal conditioning circuit of ACFM (Alternating Current Field Measurement) digital detector |
| CN102997770A (en) * | 2012-10-31 | 2013-03-27 | 江西理工大学 | Underground signal generating device for detecting and identifying blind shot for blasting chamber |
| CN102997770B (en) * | 2012-10-31 | 2015-01-21 | 江西理工大学 | Underground signal generating device for detecting and identifying blind shot for blasting chamber |
| CN105353417A (en) * | 2015-09-28 | 2016-02-24 | 芜湖市恒峰科技有限公司 | Low-power detection circuit of underground metal pipeline |
| CN105607148A (en) * | 2015-12-18 | 2016-05-25 | 北京航星机器制造有限公司 | Safety-check door parameter intelligent setting method |
| CN105607148B (en) * | 2015-12-18 | 2018-04-17 | 北京航星机器制造有限公司 | A kind of detector gate parameter intelligent set-up method |
| CN109073773A (en) * | 2016-02-15 | 2018-12-21 | 梅特拉森斯有限公司 | The improvement of magnetic detector |
| CN106504471A (en) * | 2016-10-27 | 2017-03-15 | 南京理工大学 | A kind of nearly electricity early warning system of motor vehicles and machines |
| CN113625351A (en) * | 2021-08-17 | 2021-11-09 | 上海亨临光电科技有限公司 | Method for feeding back voltage value of detector channel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201622355U (en) | Metal detection door | |
| CN102608452A (en) | High speed train equipment state and electric energy quality monitoring system and method | |
| CN100381967C (en) | Circuitry for signal measurement | |
| US9599651B2 (en) | Systems and methods of detecting ground faults in energy storage and/or generation systems that employ DC/AC power conversion systems | |
| CN203433080U (en) | Non-contact electrical-equipment discharge-monitoring device based on technology of ultraviolet pulse detection | |
| CN102944759A (en) | Non-contact early warning system for high-voltage power equipment | |
| CN104215817A (en) | Quick-response core-penetrating type direct-current leakage current sensor | |
| CN209403658U (en) | Safe distance detects safety cap | |
| CN202583342U (en) | Equipment state and electric energy-quality monitoring system for high speed train | |
| CN203012028U (en) | Non-contact early warning system of high voltage electric power equipment | |
| CN104655941A (en) | Electromagnetic radiation detection method and device and electronic equipment | |
| RU187535U1 (en) | PORTABLE COMBINED DETECTOR FOR DETECTION OF RADIOACTIVE AND METAL OBJECTS | |
| CN108089053B (en) | Excitation self-test circuit | |
| CN106705937B (en) | Voltage shaft tower inclination monitoring system and method based on differential capacitance | |
| CN108415088A (en) | Waveforms detection method based on metal detection | |
| CN104916059A (en) | EEMD-based M-Z interferometer type airport perimeter early warning system pattern recognition method | |
| CN104062673B (en) | Core analyzer self-diagnosable system | |
| KR102645257B1 (en) | Distributing board and cabinet panel, motor control center having overcurrent leakage arc monitoring system using smart instrumentation device | |
| CN115856409A (en) | Current detection device, method, equipment, system and medium | |
| CN108152524A (en) | A kind of Hall wheel detector and its method of work | |
| CN213023527U (en) | On-spot calibration equipment of portable arrester on-line monitoring device | |
| CN208861436U (en) | A kind of safe distance warning device for supertension line | |
| CN108128679A (en) | Elevator personnel's detection method | |
| CN205353221U (en) | Induction type thunder and lightning early warning device | |
| CN106226825A (en) | A kind of metal detecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20120414 |