CN103017888B - Landmine inherent frequency acousto-optic measurement device and method - Google Patents
Landmine inherent frequency acousto-optic measurement device and method Download PDFInfo
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- CN103017888B CN103017888B CN201210532324.0A CN201210532324A CN103017888B CN 103017888 B CN103017888 B CN 103017888B CN 201210532324 A CN201210532324 A CN 201210532324A CN 103017888 B CN103017888 B CN 103017888B
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Abstract
The invention discloses a landmine inherent frequency acousto-optic measurement device and method. The landmine inherent frequency acousto-optic measurement device comprises a signal generator, a sound wave emission system, a laser Doppler vibrometer, a data collection card, a computer, a landmine box, a soil sample and a small reflector, wherein the signal generator is connected with the sound wave emission system through a lead wire; the laser Doppler vibrometer is sequentially connected with the data collection card and the computer through a data line; the soil sample is placed in the landmine box; and the small reflector is placed on the soil sample placed in the landmine box. The signal generator emits continuous frequency sweeping low-frequency sound waves, vibration signals on the small reflector are detected through the laser Doppler vibrometer, amplitude-versus-frequency curves of the vibration signals with and without landmine sample burying are obtained, and the landmine inherent frequency is obtained in a ratio solving method. The landmine inherent frequency acousto-optic measurement device and method can achieve non-contact, fast and accurate measurement of the landmine inherent frequency.
Description
Technical field
The present invention relates to mine detection technical field, especially the sound and light detecting device and method of nonmetallic mine mechanical property.
Background technology
The safety of nonmetallic mine, reliable detection are international bottleneck difficult problems always.Conventional metal detector is because being can only survey metallic mine based on electromagnetic induction principle, poor to the tenor nonmetallic mine Effect on Detecting such as plastics seldom.For imaging techniques such as infrared, ground penetrating radar, X ray, in detection mechanism, impalpable is buried the type of thing; For non-imaging technique, as neutronic analyse, it has stronger distinguishing ability by the chemical characteristic of test material, but system is complicated especially, detection signal is too faint, still in the application feasibility demonstration stage.
Acoustic resonance mine-detecting technique based on land mine mechanical property has been shown good detection prospect, and wherein land mine natural frequency is to weigh an Important Parameters of land mine mechanical property.The physical dimension of land mine and common depth of burial, determined that the resonant frequency of the resonator system that land mine and the buried soil above it form is in low-frequency range, and land mine and its top soil form the in the situation that of resonator system at acoustic wave excitation and resonance occurs, this resonant frequency equates with the natural frequency of land mine or approaches.Therefore, by the resonance situation of detection system, can measure land mine natural frequency.
Lack at present commercialization or special-purpose land mine natural frequency measurement mechanism, typical land mine natural frequency sound and light measurement device should comprise that acoustic emission system, land mine bury device and noncontact vibration signal detection system.At present, at acoustic emission system aspects, there is commercial product, but lack land mine, bury being used in combination of device; Aspect vibration signal detection system, having specialized equipment, but reflectivity when detecting light beam and inciding on ground is lower, is difficult to carry out the high sensitivity of ground vibration, effective non-contact detecting.The present invention launches for this gordian technique just.
Summary of the invention
The object of the invention is to overcome the problem that there is no at present the special-purpose aspects such as land mine natural frequency sound and light measurement device, a kind of contactless land mine natural frequency sound and light measurement device and measuring method are provided, can realize the non-cpntact measurement to the high precision of land mine natural frequency, fast speed.
For achieving the above object, the present invention adopts following technical proposals:
A kind of sound and light measurement device of land mine natural frequency, comprise signal generator, acoustic emission system, LASER DOPPLER VIBROMETER, data collecting card, computing machine, caisson, pedotheque and small reflector, described signal generator connects described acoustic emission system by wire, described LASER DOPPLER VIBROMETER connects described data collecting card and described computing machine by data line successively, described pedotheque packs described caisson into, on the described pedotheque in packing described caisson into, places described small reflector.
A sound and light measurement method for land mine natural frequency, adopts above-mentioned measurement mechanism, and the concrete implementation step of this method is:
(1) the sounding port of acoustic emission system is aimed to small reflector position;
(2) by LASER DOPPLER VIBROMETER perpendicular alignmnet small reflector, launch detection beam signal;
(3) by signal generator, sending frequency is
f 0initial sine wave signal, by acoustic emission system, send high-intensity sound wave, in small reflector position, inspire frequency and be
f 0vibration signal;
(4) utilize LASER DOPPLER VIBROMETER to detect the vibration signal of small reflector position, by data collecting card, gather and be transferred to record in computing machine;
(5) the sinusoidal acoustic signals frequency of signal generator being sent increases 1Hz, the frequency of sending sine wave signal for (
f 0+ 1), take the step identical with step (3)-(4), record the vibration signal of small reflector position under this frequency acoustic wave excitation;
(6) operation of repeating step (5), the sinusoidal acoustic signals frequency that signal generator (101) is sent increases
nhz,
nfor being greater than 1 natural number, be recorded to predeterminated frequency for (
f 0+
n) time the vibration signal of small reflector position, and in described computing machine, obtain and record surveyed vibration signal about exciting sine wave freuqency
f 0,
f 0+ 1,
f 0+ 2 ...,
f 0+
namplitude-versus-frequency curve;
(7) land mine sample is placed into the soil in sample, and small reflector is placed on the pedotheque directly over land mine sample;
(8) keep the parameter of acoustic emission system to arrange constant, take the step identical with step (1)-(6), measure and be recorded in be embedded with small reflector position in land mine situation vibration signal about exciting sine wave freuqency
f 0,
f 0+ 1,
f 0+ 2 ...,
f 0+
namplitude-versus-frequency curve;
(9) by what try to achieve in step (8), have land mine to bury vibration amplitude-versus-frequency curve in situation to ask ratio with the corresponding amplitude of burying the vibration amplitude-versus-frequency curve in situation without land mine of trying to achieve in step (6), draw the amplitude-versus-frequency curve of this ratio;
(10) according to the amplitude-versus-frequency curve that has, buries without land mine vibration amplitude ratio in situation of trying to achieve in step (9), find out the amplitude of ratio maximum and corresponding Frequency point, the Frequency point that this maximum ratio is corresponding is measured land mine natural frequency.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage: acoustic emission system, land mine sample and land mine are buried to device and be used in combination, solved the problem that excites of land mine resonance; When vibration signal detects, utilized small reflector, the sensitivity that has solved the vibration signal detection system based on LASER DOPPLER VIBROMETER improves problem.
Accompanying drawing explanation
Fig. 1 is land mine natural frequency sound and light measurement apparatus structure schematic diagram of the present invention;
Fig. 2 is land mine natural frequency sound and light measurement step block diagram.
Embodiment
The preferred embodiments of the present invention are discussed below by reference to the accompanying drawings:
Referring to Fig. 1, a kind of sound and light measurement device of land mine natural frequency, comprise signal generator 101, acoustic emission system 102, LASER DOPPLER VIBROMETER 103, data collecting card 104, computing machine 105, caisson 106, pedotheque 107 and small reflector 108, described signal generator 101 connects described acoustic emission system 102 by wire, described LASER DOPPLER VIBROMETER 103 connects described data collecting card 104 and described computing machine 105 by data line successively, described pedotheque 107 packs described caisson 106 into, on described pedotheque 107 in packing described caisson 106 into, place described small reflector 108.
Referring to Fig. 1 and Fig. 2, a kind of sound and light measurement method of land mine natural frequency, adopts above-mentioned measurement mechanism, and the concrete implementation step of this method is:
(1) the sounding port of acoustic emission system 102 is aimed to small reflector 108 positions;
(2) by LASER DOPPLER VIBROMETER 103 perpendicular alignmnet small reflectors 108, launch detection beam signal;
(3) by signal generator 101, sending frequency is
f 0initial sine wave signal, by acoustic emission system 102, send high-intensity sound wave, in small reflector 108 positions, inspire frequency and be
f 0vibration signal;
(4) utilize LASER DOPPLER VIBROMETER 104 to detect the vibration signal of small reflector 108 positions, by data collecting card 104, gather and be transferred to record in computing machine 105;
(5) the sinusoidal acoustic signals frequency of signal generator 101 being sent increases 1Hz, the frequency of sending sine wave signal for (
f 0+ 1), take the step identical with step (3)-(4), record the vibration signal of small reflector 108 positions under this frequency acoustic wave excitation;
(6) operation of repeating step (5), the sinusoidal acoustic signals frequency that signal generator (101) is sent increases
nhz,
nfor being greater than 1 natural number, be recorded to predeterminated frequency for (
f 0+
n) time the vibration signal of small reflector 108 positions, and obtain and record surveyed vibration signal about exciting sine wave freuqency in described computing machine 105
f 0,
f 0+ 1,
f 0+ 2 ...,
f 0+
namplitude-versus-frequency curve;
(7) land mine sample 109 is placed into the soil in sample 107, and small reflector 108 is placed on the pedotheque 107 directly over land mine sample 109;
(8) keep the parameter of acoustic emission system 102 to arrange constant, take the step identical with step (1)-(6), measure and be recorded in be embedded with small reflector 108 positions in land mine situation vibration signal about exciting sine wave freuqency
f 0,
f 0+ 1,
f 0+ 2 ...,
f 0+
namplitude-versus-frequency curve;
(9) by what try to achieve in step (8), have land mine to bury vibration amplitude-versus-frequency curve in situation to ask ratio with the corresponding amplitude of burying the vibration amplitude-versus-frequency curve in situation without land mine of trying to achieve in step (6), draw the amplitude-versus-frequency curve of this ratio;
(10) according to the amplitude-versus-frequency curve that has, buries without land mine vibration amplitude ratio in situation of trying to achieve in step (9), find out the amplitude of ratio maximum and corresponding Frequency point, the Frequency point that this maximum ratio is corresponding is measured land mine natural frequency.
AFG3022 random waveform/function generator that the signal generator 101 of using in the present embodiment adopts Tektronix company to produce, the acoustic emission system 102 of using adopts the MG8/2FX sound console of being produced by Yamaha company, the sound system that the JB215 Professional sound box that the PA2000 power amplifier that Hangzhou Sheng Bo Electronic Science and Technology Co., Ltd. produces and Soundking Group Co.,Ltd produce forms, land mine sample 109 adopts the antitank plastics practice mine of 69 formula, the NI-PXI multichannel data acquisition system that data collecting card adopts American National instrument (NI) company limited to produce, the PDV-100 LASER DOPPLER VIBROMETER that Doppler's vibroscope adopts German Polytec company to produce.
Claims (1)
1. the sound and light measurement device of a land mine natural frequency, it is characterized in that, comprise signal generator (101), acoustic emission system (102), LASER DOPPLER VIBROMETER (103), data collecting card (104), computing machine (105), caisson (106), pedotheque (107) and small reflector (108), described signal generator (101) connects described acoustic emission system (102) by wire, described LASER DOPPLER VIBROMETER (103) connects described data collecting card (104) and described computing machine (105) by data line successively, described pedotheque (107) is packed in described caisson (106), at the upper described small reflector (108) of placing of described pedotheque (107), concrete implementation step is:
(1) the sounding port of acoustic emission system (102) is aimed to small reflector (108) position;
(2) by LASER DOPPLER VIBROMETER (103) perpendicular alignmnet small reflector (108), launch detection beam signal;
(3) by signal generator (101), sending frequency is
f 0initial sine wave signal, by acoustic emission system (102), send high-intensity sound wave, in small reflector (108) position, inspire frequency and be
f 0vibration signal;
(4) utilize LASER DOPPLER VIBROMETER (103) to detect the vibration signal of small reflector (108) position, by data collecting card (104), gather and be transferred to record in computing machine (105);
(5) the sinusoidal acoustic signals frequency of signal generator (101) being sent increases 1Hz, the frequency of sending sine wave signal for (
f 0+ 1), take the step identical with step (3)-(4), record the vibration signal of small reflector (108) position under this frequency acoustic wave excitation;
(6) operation of repeating step (5), the sinusoidal acoustic signals frequency that signal generator (101) is sent increases
nhz,
nfor being greater than 1 natural number, be recorded to predeterminated frequency for (
f 0+
n) time the vibration signal of small reflector (108) position, and obtain and record surveyed vibration signal about exciting sine wave freuqency in described computing machine (105)
f 0,
f 0+ 1,
f 0+ 2 ...,
f 0+
namplitude-versus-frequency curve;
(7) land mine sample (109) is placed into the soil in sample (107), and small reflector (108) is placed on the pedotheque (107) directly over land mine sample (109);
(8) keep the parameter of acoustic emission system (102) to arrange constant, take the step identical with step (1)-(6), measure and be recorded in be embedded with small reflector in land mine situation (108) position vibration signal about exciting sine wave freuqency
f 0,
f 0+ 1,
f 0+ 2 ...,
f 0+
namplitude-versus-frequency curve;
(9) by what try to achieve in step (8), have land mine to bury vibration amplitude-versus-frequency curve in situation to ask ratio with the corresponding amplitude of burying the vibration amplitude-versus-frequency curve in situation without land mine of trying to achieve in step (6), draw the amplitude-versus-frequency curve of this ratio;
(10) according to the amplitude-versus-frequency curve that has, buries without land mine vibration amplitude ratio in situation of trying to achieve in step (9), find out the amplitude of ratio maximum and corresponding Frequency point, the Frequency point that this maximum ratio is corresponding is measured land mine natural frequency.
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| CN103995282A (en) * | 2014-05-12 | 2014-08-20 | 上海大学 | Landmine resonance intensity measurement device and method |
| CN103994814B (en) * | 2014-05-12 | 2016-04-27 | 上海大学 | The multi-modal vibration shape measurement mechanism of land mine and measuring method |
| CN104713690A (en) * | 2015-01-30 | 2015-06-17 | 深圳大学 | System and method for identifying inherent frequency of component |
| CN112161693A (en) * | 2020-09-04 | 2021-01-01 | 威凯检测技术有限公司 | Method for detecting vibration frequency of electric toothbrush |
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| CN102540245A (en) * | 2012-01-06 | 2012-07-04 | 上海大学 | Device and method for measuring resonance intensity of land mine |
| CN102768363A (en) * | 2012-07-12 | 2012-11-07 | 上海大学 | Vehicle-mounted acoustic-to-seismic coupling detection device |
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| JP2004069301A (en) * | 2002-08-01 | 2004-03-04 | Kazuya Mori | Acoustic inspection method and acoustic inspection device |
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| CN102540245A (en) * | 2012-01-06 | 2012-07-04 | 上海大学 | Device and method for measuring resonance intensity of land mine |
| CN102768363A (en) * | 2012-07-12 | 2012-11-07 | 上海大学 | Vehicle-mounted acoustic-to-seismic coupling detection device |
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