CN1603803A - Impulse excitation electromagnetic resonance safety inspection method and device - Google Patents
Impulse excitation electromagnetic resonance safety inspection method and device Download PDFInfo
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- CN1603803A CN1603803A CN 200410091183 CN200410091183A CN1603803A CN 1603803 A CN1603803 A CN 1603803A CN 200410091183 CN200410091183 CN 200410091183 CN 200410091183 A CN200410091183 A CN 200410091183A CN 1603803 A CN1603803 A CN 1603803A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005284 excitation Effects 0.000 title claims abstract description 17
- 238000007689 inspection Methods 0.000 title claims description 9
- 230000001052 transient effect Effects 0.000 claims abstract description 7
- 230000005291 magnetic effect Effects 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 8
- 230000005294 ferromagnetic effect Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 230000010355 oscillation Effects 0.000 claims description 6
- 230000008447 perception Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000001143 conditioned effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 abstract 2
- 238000000691 measurement method Methods 0.000 abstract 2
- 238000005259 measurement Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010001488 Aggression Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002594 fluoroscopy Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
This invention is based on electromagnetism lossless measurement theory and provides an impulse exciting electromagnetism resonance safety measurement method and its apparatus and belongs to electromagnetism lossless measurement technique field. This invention adopts transient high-energy impact excitation loop and establishes an attenuation resonance magnetism field. The detection loop is used to feel space magnetism field excitation and is connected with the alarming circuit through signal process circuit.
Description
Technical field
The invention belongs to the electromagnetic nondestructive testing field.
Background technology
The patent of the safety inspection aspect of application at home and abroad is existing multinomial, but great majority are to utilize X ray or gamma-ray height transmissison characteristic, are that a kind of gamma activity safety detection device, application number that 02289591.4 Chinese patent discloses are that high-integrated-level low-energy X-ray sensors array, application number that 99100298.9 Chinese patent discloses are that multifunctional industrial X-ray imaging system, application number that 99113199.1 Chinese patent discloses are the Portable X-ray fluoroscopy record instrument that discloses of 90103530.0 Chinese patent etc. as application number.Wherein some patent has been converted into ripe product, as be widely used in the safety check apparatus of porch, place such as station, harbour, airport, these devices all are to have adopted the radioscopy imaging technique, except complex structure involved great expense, its radiativity also can produce certain harm and damage to photoactive substances such as biosome and films when operate as normal.
Summary of the invention
At the weak points such as radiation hazard of prior art, the present invention has proposed a kind of impulse excitation electromagnetic resonance safety inspection method and device according to the electromagnetic nondestructive theory.
The objective of the invention is to be achieved through the following technical solutions:
1) transistor switch of control signal control that utilizes driving source to produce carries out the excitation of transient state high energy impact to drive coil and obtains pumping signal, and the initial pulsewidth of described pumping signal is recently controlled by the duty of described control signal;
2) drive coil behind transient excite has been set up a resonance oscillation attenuation magnetic field in the space, utilizes the violent change that detects the described space magnetic field of coil perception, obtains detecting signal;
3) with detecting signal after low-pass filtering, amplification, peak value sampling are handled, carry out differential ratio with adjustable setting threshold, thereby sensitive in real time judge whether to exist ferromagnetic object.
The present invention also provides a kind of safety check isolated plant of implementing as above-mentioned method, comprise driver unit and detect part, it is characterized in that: described driver unit is mainly by driving source, transistor switch, drive coil becomes with the resonance capacitance group, in driver unit, the control signal output ends of described driving source links to each other with the control end of described transistor switch, the input end of described transistor switch links to each other with the excitation energy input end, the output terminal of described transistor switch links to each other with drive coil by a switching diode, described drive coil and resonant capacitance parallel connection realize effectively vibration; The described part that detects is mainly formed by detecting coil, low-pass filter circuit, amplifying circuit, peak value sampling circuit, difference comparator circuit and warning circuit, detecting part, the described coil that detects links to each other with the peak value sampling circuit by low-pass filter circuit, amplifying circuit, links to each other with warning circuit behind the described peak value sampling circuit process difference comparator circuit.
Drive coil of the present invention and to detect the coil axially parallel placed side by side.
Safety check isolated plant of the present invention also comprises a high capacity storage capacitor, and it is in parallel with described transistor switch, guarantees to inject in drive coil sufficient electric current.
Safety check isolated plant of the present invention also comprises a threshold setting conditioned circuit, and it links to each other with described difference comparator circuit, in order to regulate alarm threshold value.
Impulse excitation electromagnetic resonance safety inspection method of the present invention uses the low-frequency pulse smaller or equal to 10kHz to encourage, drive coil is set up a resonance oscillation attenuation magnetic field in the space, from the attenuation process of signal, extract needed signal, the space magnetic field that is detected is changed comparatively responsive.Detect the variation of coil in order to inductive spacing magnetic field.Ferromagnetic object is arranged through out-of-date in space magnetic field, violent change will take place in space magnetic field, and then causes detecting the impedance variation of coil, and realization detects ferromagnetic object, has avoided harm and damage that photoactive substances such as biosome and film are produced.Preliminary result of study shows, the radiationless harm of impulse excitation electromagnetic resonance safety inspection method, can be sensitive in real time detect ferromagnetic object, by the adjusting alarm threshold value, to adapt to different safety check demands.The present invention proposes a new method that is different from traditional safety inspection method, significant to national safe examination system and association area.
Description of drawings
Fig. 1 is the theory diagram of the method for the invention.
Fig. 2 is the circuit theory diagrams of driver unit of the present invention.
Fig. 3 is the theory diagram that detects part of the present invention.
Fig. 4 is the signal waveforms in the drive coil.
Fig. 5 is the signal waveforms of detecting signal after low-pass filtering and amplification that detects in the coil.
Fig. 6 is the signal and the signal waveform corresponding relation figure of detecting signal after low-pass filtering and amplification that detects in the coil in the drive coil.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing.
Fig. 1 is the method theory diagram.Space magnetic field 10 links together driver unit with detecting partly, drive coil 20 carries out the excitation of transient state high energy impact by the control signal that driving source 40 produces by transistor switch 30, pumping signal has been set up a resonance oscillation attenuation magnetic field in the space, promptly space magnetic field 10.The initial pulsewidth of the dutycycle size decision pumping signal of control signal, and then the maximal value of control pumping signal, the i.e. maximal value in resonance oscillation attenuation magnetic field.Wherein, the excitation energy input end adopts the DC voltage more than or equal to 5V; Because the limitation of coil storage power, when dutycycle increases to 10% when above, the maximal value of pumping signal can not proportionally rise, and basic effect with 10% is fair; Less than 10% o'clock, increase the sensitivity that dutycycle helps improving space magnetic field.
When ferromagnetic object process space magnetic field 10, cause space magnetic field 10 violents change, detect coil 50 perception magnetic field violent change signals, after the low-pass filtering of process signal processing circuit 60, amplification, peak value sampling are handled, carry out differential ratio with adjustable setting threshold, judge the existence of ferromagnetic object in real time delicately.
Safety check apparatus of the present invention comprises driver unit and detects part.
Fig. 2 is the circuit theory diagrams of driver unit.Described driver unit is mainly become by driving source, transistor switch, drive coil and resonance capacitance group.Transistor switch 30 comprises NPN transistor, the PNP transistor is connected resistance with two, the control signal output ends Vo of driving source 40 links to each other by a base stage that connects resistance and NPN transistor, the control excitation energy pour frequency and pulsewidth, the collection utmost point of NPN transistor connects resistance by another and is connected with the transistorized base stage of described PNP, the transistorized emitter-base bandgap grading of PNP links to each other with excitation energy input end 100, the transistorized collection utmost point of PNP links to each other with drive coil 20 by a switching diode 70, switching diode 70 is used for the inflow direction of control energy, with transistor switch 30 synergies, be beneficial to the generation of electromagnetic resonance; Drive coil 20 and resonant capacitance 90 parallel connections realize effectively vibration.This device also can comprise a high capacity storage capacitor 80 in parallel with transistor switch 30, guarantees to inject in drive coil sufficient electric current, required energy during in order to auxiliary transient state high energy impact excitation.Driving source circuit of the present invention is a core by 555 chips, is aided with resistance, electric capacity and diode and constitutes.This installs described described drive coil and detects the coil axially parallel placed side by side, parameter such as following table, FERRITE CORE parameter: 60 * 14 * 14mm.
Table 1 coil parameter table
Drive coil detects coil
The number of turn 300 300
Inductance 45.07mH 44.60mH
Resistance 98.7ohm 96.2ohm
Fig. 3 is the theory diagram that detects part of the present invention.The described part that detects is mainly formed by detecting coil 50, low-pass filter circuit 130, amplifying circuit 140, peak value sampling circuit 150, difference comparator circuit 160 and warning circuit 110.Detect detecting signal that coil 50 perception obtain through 130 filtering of RC low-pass filter circuit after, at first utilize amplifying circuit 140 (as operational amplifier OP27) to amplify, next utilizes the signal after 150 pairs of amplifications of peak value sampling circuit of being made up of emitter follower circuit, diode and electric capacity to carry out peak value sampling, then utilize signal and setting threshold behind 160 pairs of peak value samplings of difference comparator circuit of forming by comparer LM393 to carry out differential ratio, be connected at last with the warning circuit of using always 110.Above-mentioned setting threshold can be provided by the threshold setting conditioned circuit 170 of routine, and it links to each other with described difference comparator circuit 160, thereby regulates alarm threshold value.
Fig. 4 is the signal waveforms in the drive coil, and it has shown the waveform of the resonance oscillation attenuation field signal in space.
Fig. 5 is the signal waveforms of detecting signal after low-pass filtering and amplification that detects in the coil.This shows that detecting coil has extremely responsive reaction to the ferromagnetic object that enters space magnetic field.
Fig. 6 is the signal and the signal waveform corresponding relation figure of detecting signal after low-pass filtering and amplification that detects in the coil in the drive coil.It has illustrated the phase relation and the amplitude relation of pumping signal and detecting signal correspondence.
Claims (5)
1. impulse excitation electromagnetic resonance safety inspection method is characterized in that, described method comprises the steps:
1) transistor switch of control signal control that utilizes driving source to produce carries out the excitation of transient state high energy impact to drive coil and obtains pumping signal, and the initial pulsewidth of described pumping signal is recently controlled by the duty of described control signal;
2) drive coil behind transient excite has been set up a resonance oscillation attenuation magnetic field in the space, utilizes the violent change that detects the described space magnetic field of coil perception, obtains detecting signal;
3) with detecting signal after low-pass filtering, amplification, peak value sampling are handled, carry out differential ratio with adjustable setting threshold, thereby judge whether to exist ferromagnetic object delicately in real time.
2. isolated plant of realizing the described safety inspection method of claim 1, comprise driver unit and detect part, it is characterized in that: described driver unit is mainly by driving source, transistor switch, drive coil becomes with the resonance capacitance group, in driver unit, the control signal output ends of described driving source links to each other with the control end of described transistor switch, the input end of described transistor switch links to each other with the excitation energy input end, the output terminal of described transistor switch links to each other with drive coil by a switching diode, described drive coil and resonant capacitance parallel connection realize effectively vibration; The described part that detects is mainly formed by detecting coil, low-pass filter circuit, amplifying circuit, peak value sampling circuit, difference comparator circuit and warning circuit, detecting part, the described coil that detects links to each other with the peak value sampling circuit by low-pass filter circuit, amplifying circuit, links to each other with warning circuit behind the described peak value sampling circuit process difference comparator circuit.
3. safety check isolated plant according to claim 2 is characterized in that: described drive coil and to detect the coil axially parallel placed side by side.
4. safety check isolated plant according to claim 2 is characterized in that: this device also comprises a high capacity storage capacitor, and it is in parallel with described transistor switch, guarantees to inject in drive coil sufficient electric current.
5. safety check isolated plant according to claim 2 is characterized in that: this device also comprises a threshold setting conditioned circuit, and it links to each other with described difference comparator circuit, in order to regulate alarm threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100911839A CN100363757C (en) | 2004-11-23 | 2004-11-23 | Impulse excitation electromagnetic resonance safety inspection method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100911839A CN100363757C (en) | 2004-11-23 | 2004-11-23 | Impulse excitation electromagnetic resonance safety inspection method and device |
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| Publication Number | Publication Date |
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| CN1603803A true CN1603803A (en) | 2005-04-06 |
| CN100363757C CN100363757C (en) | 2008-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100911839A Expired - Fee Related CN100363757C (en) | 2004-11-23 | 2004-11-23 | Impulse excitation electromagnetic resonance safety inspection method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677980A (en) * | 2013-11-29 | 2015-06-03 | 满坚 | Metal detector for aluminum foil packaged food |
| CN105417485A (en) * | 2015-11-28 | 2016-03-23 | 成都华气厚普电子技术有限公司 | Intelligent gun disengagement detection device and detection method |
| CN106094047A (en) * | 2016-08-17 | 2016-11-09 | 中国电子科技集团公司第二十九研究所 | A kind of array safety inspection method based on magnetic abnormal detection and device |
| CN106773676A (en) * | 2016-11-30 | 2017-05-31 | 浙江中控软件技术有限公司 | For the generation method and device of the pumping signal of chemical process |
| CN108318075A (en) * | 2018-02-09 | 2018-07-24 | 李法利 | The control circuit of safety check apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1138987C (en) * | 2001-01-18 | 2004-02-18 | 信息产业部电子第五十研究所 | Bi-frequency metal locator |
| US6958603B2 (en) * | 2001-09-21 | 2005-10-25 | Tok Engineering Co., Ltd. | Method for detecting metallic foreign matter and system for detecting metallic foreign matter |
| JP2004028740A (en) * | 2002-06-25 | 2004-01-29 | Kura Gijutsu Kenkyusho:Kk | Inspection device for detecting defect or presence/absence of magnetic body or conductor |
| US6690316B2 (en) * | 2002-09-27 | 2004-02-10 | The United States Of America As Represented By The Secretary Of The Army | System and method for automated alerting to geospatial anomalies |
-
2004
- 2004-11-23 CN CNB2004100911839A patent/CN100363757C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677980A (en) * | 2013-11-29 | 2015-06-03 | 满坚 | Metal detector for aluminum foil packaged food |
| CN105417485A (en) * | 2015-11-28 | 2016-03-23 | 成都华气厚普电子技术有限公司 | Intelligent gun disengagement detection device and detection method |
| CN106094047A (en) * | 2016-08-17 | 2016-11-09 | 中国电子科技集团公司第二十九研究所 | A kind of array safety inspection method based on magnetic abnormal detection and device |
| CN106773676A (en) * | 2016-11-30 | 2017-05-31 | 浙江中控软件技术有限公司 | For the generation method and device of the pumping signal of chemical process |
| CN106773676B (en) * | 2016-11-30 | 2019-12-24 | 浙江中控软件技术有限公司 | Method and device for generating excitation signal for chemical process |
| CN108318075A (en) * | 2018-02-09 | 2018-07-24 | 李法利 | The control circuit of safety check apparatus |
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| CN100363757C (en) | 2008-01-23 |
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