CN105116455A - Detector for composite metals and non-linear nodes - Google Patents
Detector for composite metals and non-linear nodes Download PDFInfo
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- CN105116455A CN105116455A CN201510614554.5A CN201510614554A CN105116455A CN 105116455 A CN105116455 A CN 105116455A CN 201510614554 A CN201510614554 A CN 201510614554A CN 105116455 A CN105116455 A CN 105116455A
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Abstract
The present invention provides a detector for composite metals and non-linear nodes, mainly including a portable type detection host and a composite metal node detecting head. The composite metal node detecting head includes a node detecting antenna, a metal transmitting-receiving coil, and a microwave shielding hood. The microwave shielding hood covers a transmitting loop of the node detecting antenna, is arranged between the node detecting antenna and the metal transmitting-receiving coil, and isolates the metal transmitting-receiving coil so as to avoid composite electromagnetic compatibility, signal crosstalk, and mutual interference when two detectors work at the same time. A working frequency is in a range of 25KHZ-30KHZ. The detector can be used for detecting an electronic explosion apparatus with PN nodes, a dangerous article containing metals, and particularly an explosive article and a dangerous article disguised by an all-metal strong shielding. The detector solves problems of composite electromagnetic compatibility, signal crosstalk, and mutual interference between two instruments, and shields other equipment on the site at late operation. Compared to a method in the prior art that the metal detector and the non-linear node detector are used individually, the detector halves the labour so as to greatly increase a detection speed and detection efficiency, and increase a regulating function for receiving sensitivity.
Description
Technical field
The invention belongs to object detection technical field, especially relate to a kind of metal composite non-linear node detector integrating metallicity detection and non-linear node detection.
Background technology
Metal species detection and electrical type object are hidden in interior of articles and deep under ground, be difficult to judgment object duty and object why type, for a long time the even spiritual fear of huge manpower and materials and injury are caused to us, as metallicity bomb, shield by force the explosive of camouflage and all kinds of metallicity dangerous material through all-metal.Each state all at development multiple security detection equipment, is broken through all in various degree from the hierarchy of skill.But to the depth finding of target object and the detection of compound material is existing is also in deficiency state.
Metal species node detector is determined by the parameter LC of oscillation circuit.After electric capacity is determined, depend primarily on the inductance of magnetic test coil.Highly sensitive during usual frequency height, as the industrial metal detector that so-and-so company limited produces, its frequency of operation is 10KHZ-20KHZ, is 20KHZ under high sensitivity service condition.By external knob regulable control frequency height, for mode of operation is prepared, have more unlike material and choose different frequency, as when frequency is greater than 12KHZ, detecting the sensitivity of brass material will improve greatly, and unfavorable to detecting steel ball; When frequency is less than 4KHZ, the sensitivity detecting brass material slightly reduces, and raises the detection sensitivity of steel ball, so frequency improves certain limit.Above-mentioned metal species detector operates comparatively complicated under adjustment of sensitivity and different mode simultaneously, different to different metal mass sensitivity.
Summary of the invention
The object of this invention is to provide a kind of composite detector integrating metal detection and non-linear node detection, solve the deep layer detection of target object and compound material detection problem, reach two kinds of detectors and to work separate non-interfering object simultaneously.
For achieving the above object, the invention provides a kind of metal composite non-linear node detector, it is characterized in that: mainly comprise portable detection main frame and composite metal node detecting head, the two is connected by radio frequency connecting cable, composite metal node detecting head comprises node exploring antenna, metal radiate receiving coil, micro-wave screening cover, node exploring antenna comprises to be launched circle and receives circle, is respectively used to emitting radio frequency signal, receives the higher hamonic wave reflected; Metal radiate receiving coil is for generation of low frequency pulse signal and send to surrounding space to change magnetic field; Micro-wave screening cover covers on the transmitting circle of node exploring antenna, is placed between node exploring antenna and metal radiate receiving coil, isolating metal launch and accept coil, two kinds of detectors is worked simultaneously and avoids composite electromagnetic compatibility, signal cross-talk and mutually interfere; Frequency of operation is 25KHZ-30KHZ.
Described micro-wave screening cover is macromolecule shielding paper, cylindrical, and front end has oblique shape opening, and openings of sizes is the fan beam region of 30 degree of-70 degree.
Described portable detection main frame comprises:
Power module, is connected with power supply, powers and power to electrical signal communication between each module and module for detection system;
Transmitter module, connects power module, for generation of the radiofrequency signal of detection PN junction;
Receiver module, link control module and power module, tie higher hamonic wave for receiving the detected target P N collected by node exploring antenna;
Metal detection module, link control module and power module, for generation of low-frequency pulse detectable signal and process metal signal;
Control module, connects receiver module, power module and metal detection module, for the treatment of harmonic signal and metal detection signal, and display alarm.
Described transmitter module and receiver module inside produce high-frequency impulse modulation signal, process reception 2 subharmonic modulation signal, process reception 3 subharmonic modulation signal.
Described transmitter module is launched output power and is divided into five grades, output power range 20mW ~ 3W, launch reference frequency output 3581.5MHZ-3607.5MHZ, automatic frequency is selected, second harmonic degree of suppression 95dBm, third harmonic degree of suppression 110dBm, to adapt to different detection scenes, effectively evades spatial electromagnetic interference.
Composite metal node detecting head of the present invention comprises node exploring antenna, metal radiate receiving coil, micro-wave screening cover, not only can be applied to the electronics of detection containing PN junction and open quick-fried device, the dangerous material containing metal can also be detected, especially the explosive and the dangerous material that shield by force camouflage through all-metal can be detected, not only solving composite electromagnetic compatibility between two instruments, signal cross-talk and mutual interference problem, is that other equipment of work on the spot have carried out shielding action when being also later stage operation.This equipment not only normally can work under high-frequency electromagnetic interference environment, can also search under complex region, place, space and particular surroundings.Be used alone mutually the manpower that metal detector and non-linear node detector will reduce a times than ever, substantially increase detection rate and efficiency, improve the search speed under place, space and particular surroundings; Frequency of operation is 25KHZ-30KHZ, adds receiving sensitivity regulatory function, is applicable to the use under various complicated, accurately can finds the detection of a target in practical operation.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the invention system assembles figure;
Fig. 2 is composite metal node measuring probe structure schematic diagram in the present invention;
Fig. 3 is the system chart of portable detection main frame in the present invention;
Fig. 4 is the theory diagram of the specific embodiment of the invention.
Embodiment
With reference to Fig. 1, the present invention forms primarily of two parts, and one be portable detection main frame 9, two is composite metal node detecting head 1, and centre is connected by radio frequency connecting cable 8.Display screen 4 is fixedly connected with extension rod 3, and extension rod 3 is connected with composite metal node detecting head 1 by probe joint 2, and 5 is operation push-buttons, and 6 is adjustment of sensitivity buttons, and 7 is handles.
With reference to Fig. 2, composite metal node detecting head comprises node exploring antenna, metal radiate receiving coil, micro-wave screening cover, node exploring antenna is helical antenna, comprise and launch circle and receive circle, the transmitter module of the portable detection main frame of respective connection and receiver module, metal radiate receiving coil connects the metal detection module of portable detection main frame, micro-wave screening cover is macromolecule shielding paper, cylindrical, cover on and launch on circle, being placed in node detection launches between circle and metal radiate receiving coil, front end has oblique shape opening, can not only isolating metal launch and accept coil, solve composite electromagnetic between two instruments compatible, signal cross-talk and mutually interference problem, the effect of shielding High-frequency and low-frequency can also be played, and carried out 30 degree-70 fan beam region spent for the transmitting circle of node exploring antenna.Test proves: the fan beam district of opening 30 degree-70 degree and frequency of operation be 25KHZ-30KHZ make sensitivity and rate of false alarm low.
With reference to Fig. 3, portable detection main frame comprises power module, transmitter module, receiver module, metal detection module, control module, power module one end is connected with power supply, power for detection system and electrical signal communication between each module and module is powered, the other end connects transmitter module, receiver module, control module and metal detection module, the radiofrequency signal of detection PN junction is produced by transmitter module, receiver module receives the detected target P N collected by node exploring antenna and ties higher hamonic wave, metal detection module produces low-frequency pulse detectable signal and process metal signal, control module connects receiver module, metal detection module, process harmonic signal and metal detection signal, and display alarm.
With reference to Fig. 4, transmitter module produces radiofrequency signal and produces first-harmonic by chirp source, ingoing power amplifier amplifies, circle radiation is launched to detecting target by being sent to by transmitter after filter process filtering, after radiofrequency signal detects non-linear PN junction target object, the secondary returned and third harmonic are received by the reception circle of node exploring antenna, reception circle reception higher hamonic wave is sent to receiver and is amplified by amplifier, enter wave filter to carry out filtering again and export to A/D module, A/D module receives higher hamonic wave conversion, export to FFT module, FFT module carries out the computing of Fu Li leaf to signal, finally result of calculation is sent to detection identification module, detect identification module and compare processes and displays warning.When detecting metal, the oscillator of metal detection module produces low frequency signal source and carries out filtering by wave filter, send into power amplifier and amplify the metal radiate receiving coil outputting to composite metal node detecting head, change magnetic field around, as found tested metal, then metal radiate receiving coil Received signal strength carries out demodulation by detuner to low frequency signal, send into balance regulator and return metal radiate receiving coil again, detectable signal is entered filter amplifier simultaneously and amplify the rear audio alert of output, thus realization opens quick-fried device to the electronics containing PN junction and the dangerous material containing metal even shield by force the explosive of camouflage and the detection of dangerous material through all-metal.
Transmitter module correlation parameter is as follows:
1. launch output power adjustable, be divided into five grades, output power range 20mW ~ 3W, to adapt to different detection scenes.
2. launch reference frequency output 3581.5--3607.5MHZ, automatic frequency is selected.In the possibility of the radiation of the carrier frequency of the lowest noise level of 2 subharmonic RX path.Wide frequency ranges and adaptive frequency are selected effectively to evade spatial electromagnetic interference.
3. harmonics restraint degree is good, second harmonic degree of suppression 95dBm, third harmonic degree of suppression 110dBm.
The maximum magnetic induction of high frequency is lower than the maximum magnetic induction of low frequency, the current vortex produced in metal object in low frequency situation is larger, thus native system selects the square wave of 27.9KHZ lower frequency to produce the sinusoidal signal of 27.9KHZ for transmitting circle, under this frequency range, good sensory characteristic can be obtained.In order to produce the magnetic field of alternation, needing sinusoidal signal as driving source, therefore, producing in engineering at sine wave and needing to stablize emphatically transmission frequency balanced oscillations point.Known by calculating, this frequency can be obtained through 27 frequency divisions by the crystal oscillator of 3.578MHZ.Square-wave signal can obtain the good sinusoidal wave 27.9KHZ of waveform after sine wave generating circuit.
Compound non-linear node detector cardinal principle is harmonic radar and electromagnetic induction principle, harmonic radar is by launching fundamental signal, receive from target radiation return 2 times again, 3 even higher harmonic signals, and radar system target being judged, identify and detects; Electromagnetic induction is the electric field by producing a kind of change, and detecting objects structural reform changed electric field magnetic induction effect makes inductive coil self-induction electromotive force receive change, and judges measured target thing by induction electromotive force.
Claims (5)
1. a metal composite non-linear node detector, it is characterized in that: mainly comprise portable detection main frame and composite metal node detecting head, the two is connected by radio frequency connecting cable, composite metal node detecting head comprises node exploring antenna, metal radiate receiving coil, micro-wave screening cover, node exploring antenna comprises to be launched circle and receives circle, is respectively used to emitting radio frequency signal, receives the higher hamonic wave reflected; Metal radiate receiving coil is for generation of low frequency pulse signal and send to surrounding space to change magnetic field; Micro-wave screening cover covers on the transmitting circle of node exploring antenna, is placed between node exploring antenna and metal radiate receiving coil, isolating metal launch and accept coil, two kinds of detectors is worked simultaneously and avoids composite electromagnetic compatibility, signal cross-talk and mutually interfere; Frequency of operation is 25KHZ-30KHZ.
2. a kind of metal composite non-linear node detector according to claim 1, it is characterized in that: described micro-wave screening cover is macromolecule shielding paper, cylindrical, front end has oblique shape opening, and openings of sizes is the fan beam region of 30 degree of-70 degree.
3. a kind of metal composite non-linear node detector according to claim 1, is characterized in that: described portable detection main frame comprises:
Power module, is connected with power supply, powers and power to electrical signal communication between each module and module for detection system;
Transmitter module, connects power module, for generation of the radiofrequency signal of detection PN junction;
Receiver module, link control module and power module, tie higher hamonic wave for receiving the detected target P N collected by node exploring antenna;
Metal detection module, link control module and power module, for generation of low-frequency pulse detectable signal and process metal signal;
Control module, connects receiver module, power module and metal detection module, for the treatment of harmonic signal and metal detection signal, and display alarm.
4. a kind of metal composite non-linear node detector according to claim 3, is characterized in that: described transmitter module and receiver module inside produce high-frequency impulse modulation signal, process reception 2 subharmonic modulation signal, process reception 3 subharmonic modulation signal.
5. a kind of metal composite non-linear node detector according to claim 3, it is characterized in that: described transmitter module is launched output power and is divided into five grades, output power range 20mW ~ 3W, launch reference frequency output 3581.5MHZ-3607.5MHZ, automatic frequency is selected, second harmonic degree of suppression 95dBm, third harmonic degree of suppression 110dBm, in order to adapt to different detection scenes, effectively evade spatial electromagnetic interference.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054177A (en) * | 2016-05-24 | 2016-10-26 | 广东电网有限责任公司信息中心 | Electronic equipment detection device based on semiconductor component detection |
| CN106778549A (en) * | 2016-11-30 | 2017-05-31 | 中国电子科技集团公司第二十九研究所 | A kind of Harmonic Detection object detection algorithms and device based on multidimensional information fusion |
| CN108490493A (en) * | 2018-03-19 | 2018-09-04 | 重庆轻足迹电子有限公司 | Conducting wire detection device |
| CN110045429A (en) * | 2019-05-28 | 2019-07-23 | 长春市泽安科技有限公司 | Portable 2.4G nonlinear node detection system |
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2015
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| US4195262A (en) * | 1978-11-06 | 1980-03-25 | Wisconsin Alumni Research Foundation | Apparatus for measuring microwave electromagnetic fields |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054177A (en) * | 2016-05-24 | 2016-10-26 | 广东电网有限责任公司信息中心 | Electronic equipment detection device based on semiconductor component detection |
| CN106778549A (en) * | 2016-11-30 | 2017-05-31 | 中国电子科技集团公司第二十九研究所 | A kind of Harmonic Detection object detection algorithms and device based on multidimensional information fusion |
| CN106778549B (en) * | 2016-11-30 | 2020-04-21 | 中国电子科技集团公司第二十九研究所 | Harmonic detection object detection algorithm and device based on multi-dimensional information fusion |
| CN108490493A (en) * | 2018-03-19 | 2018-09-04 | 重庆轻足迹电子有限公司 | Conducting wire detection device |
| CN110045429A (en) * | 2019-05-28 | 2019-07-23 | 长春市泽安科技有限公司 | Portable 2.4G nonlinear node detection system |
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Application publication date: 20151202 |