CN103017892A - Earth surface specific acoustic impedance non-contact measurement device and method - Google Patents
Earth surface specific acoustic impedance non-contact measurement device and method Download PDFInfo
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- CN103017892A CN103017892A CN2012105321936A CN201210532193A CN103017892A CN 103017892 A CN103017892 A CN 103017892A CN 2012105321936 A CN2012105321936 A CN 2012105321936A CN 201210532193 A CN201210532193 A CN 201210532193A CN 103017892 A CN103017892 A CN 103017892A
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Abstract
The invention discloses an earth surface specific acoustic impedance non-contact measurement device and method. The earth surface specific acoustic impedance non-contact measurement device comprises a sound wave emitting system, a detection device of earth surface sound waves to be tested and a detection device of earth surface vibration speed to be tested. The sound wave emitting system comprises a computer, a data collection card, a signal processing amplifier and an acoustic parametric array. The detection device of earth surface sound waves to be tested comprises the sound wave emitting system, a sound level meter and a computer. The detection device of earth surface vibration speed to be tested comprises the sound wave emitting system, a Doppler vibrometer, a data collection card and a computer. The sound wave emitting system emits high-directivity high-frequency sound waves, low-frequency sound waves are generated at the earth surface position to be tested, a sound pressure level detection device detects the sound pressure level at the earth surface position to be tested, an earth surface vibration speed detection device detects the vibration speed at the earth surface position to be tested, and the ratio of the sound pressure level at the detected earth surface position and the vibration speed at the detected earth surface position is the earth surface specific acoustic impedance. The earth surface specific acoustic impedance non-contact measurement device and method can achieve non-contact, high-accuracy and fast measurement of the earth surface specific acoustic impedance.
Description
Technical field
The present invention relates to the geophysical prospecting technology field, especially ground surface sound impedence rate non-contact measurement device for measuring and the method in the research of acoustic sounding nonmetallic mine.
Background technology
The safety of the nonmetallic mines such as plastics, reliable detection are the bottleneck problems that international removal of mines cause needs to be resolved hurrily always.Metal detector commonly used can only be surveyed metallic mine because being based on electromagnetic induction principle, and is relatively poor to the tenor nonmetallic mine Effect on Detecting such as plastics seldom.For imaging techniques such as infrared, ground penetrating radar, X ray, surveying whether the impalpable treasure trove is land mine on the mechanism; For non-imaging technique, such as neutronic analyse, it has stronger land mine distinguishing ability by the chemical characteristic that detects explosive, but system is complicated especially, detection signal is too faint, still is in the application feasibility demonstration stage.Acoustic sounding technology based on sound-earthquake coupling principle has potential application prospect, but lacks the commercial test research device of sound wave detecting a mine model investigation.
Sound-earthquake coupling refers to when the low-frequency sound wave of frequency below 1KHz incides the earth's surface by air, forms the seismic event of the Multiple components such as fast compressional wave, slow compressional wave and shear wave; Correspondingly, the ratio of the earth's surface vibration velocity of earth's surface acoustic pressure and coupling is called ground surface sound impedence rate.Reflection or scattering phenomenon can occur when the seismic event of coupling runs into land mine and get back to the earth's surface, and change the vibration velocity on earth's surface, and then change the size of ground surface sound impedence rate.Therefore, by detecting the variation abnormality situation of ground surface sound impedence rate, can be used for the research of nonmetallic mine detection aspect, but there is no at present the ground surface sound impedence rate measuring device of special-purpose non-contact detecting mode.
A typical noncontact earth's surface specific acoustic impedance measurement mechanism should comprise high directivity acoustic emission system and noncontact earth's surface vibration velocity detection system, " land mine is on the impact research of ground surface sound impedence rate ", Wang Chi etc., sensor and micro-system, 2008, the 8th phase of the 27th volume, the 36-38 page or leaf, the acoustic emission system of research is based on sound system, can not accomplish high directivity, remote acoustic emission, earth's surface vibration velocity detection system can not be carried out the non-contact detecting of earth's surface vibration velocity based on this contact speed pickup of seismoreceiver, and the present invention launches for this gordian technique just.
Summary of the invention
The object of the invention is to overcome the problem of the aspects such as measurement mechanism that there is no at present special-purpose sound-earthquake coupling mechanism research, a kind of ground surface sound impedence rate non-contact detection device and detection method are provided, can realize high precision, non-cpntact measurement fast to ground surface sound impedence rate.
For achieving the above object, the present invention adopts following technical proposals:
A kind of ground surface sound impedence rate non-contact measurement device for measuring, comprise computing machine, signal processor, acoustic parametric arrays, Doppler's vibroscope, data collecting card and sound meter, described computing machine connects the acoustic emission system that described data collecting card, described signal processor and described acoustic parametric arrays consist of by wire successively, the sonic detection system that described sound meter and described data collecting card and described computing machine connect and compose by data line, the earth's surface vibration detecting system that is connected and composed by data line by described Doppler's vibroscope and described data collecting card and described computing machine.
A kind of ground surface sound impedence rate non-contact measurement method adopts above-mentioned ground surface sound impedence rate non-contact measurement device for measuring to measure calculating, and measuring process is as follows:
(1) make acoustic parametric arrays sounding port aim at landscape position to be measured;
(2) sound meter is put in landscape position to be measured, and makes sound meter pass through wire connection data capture card and computing machine;
(3) sending difference frequency by computing machine is
f 0Two row high_frequency sine wave signals, successively by sending the sinusoidal sound wave of high directivity by acoustic parametric arrays behind data collecting card, the signal processor;
(4) change distance and the direction of acoustic parametric arrays landscape position relatively to be measured, measure frequency to sound meter and be
f 0And sound pressure level reaches the sound wave of maximum value, and records the maximum value of this sound pressure level in computing machine.
(5) keep distance and the direction of connection, parameter setting and acoustic parametric arrays landscape position relatively to be measured of the acoustic emission system that computing machine, data collecting card, signal processor be connected with acoustic parametric arrays constant, namely keep sound meter at the frequency of sound wave that landscape position to be measured detects to be
f 0And sound pressure level reaches maximum value;
(6) remove sound meter, the earth's surface vibration detecting system that utilizes Doppler's vibroscope, data collecting card and computing machine to consist of is measured the earth's surface vibration velocity of landscape position to be measured, by computer recording;
(7) the earth's surface vibration velocity at the sound pressure level maximum value at the landscape position to be measured place that surveys and the landscape position to be measured place that surveys is asked ratio, namely get landscape position to be measured and be in the excitation frequency of sound wave and be
f 0The time ground surface sound impedence rate.
The present invention compared with prior art, having following apparent outstanding substantive distinguishing features is connected with remarkable advantage computing machine, data collecting card, signal processor and acoustic parametric arrays is connected, solve the high directivity problem of low-frequency sound wave output, improved the acoustic emission system performance; When the earth's surface vibration velocity detects, realized noncontact fast detecting to the earth's surface vibration velocity by utilizing Doppler's vibroscope and multi-channel data acquisition board.
Description of drawings
Fig. 1 is ground surface sound impedence rate non-contact measurement device for measuring structural representation to be measured of the present invention;
Fig. 2 is ground surface sound impedence rate non-cpntact measurement step block diagram.
Embodiment
The preferred embodiments of the present invention are discussed below by reference to the accompanying drawings:
Embodiment one: referring to Fig. 1, the structure of this earth's surface specific acoustic impedance non-contact measurement device for measuring comprises computing machine 101, signal processor 102, acoustic parametric arrays 103, Doppler's vibroscope 104, data collecting card 105 and sound meter 106, described computing machine 101 connects described data collecting card 105 by wire successively, described signal processor 102 and described acoustic parametric arrays 103 consist of the acoustic emission system, described sound meter 106 connects and composes the sonic detection system with described data collecting card 105 and described computing machine 101 by data line, connects and composes the earth's surface vibration detecting system by described Doppler's vibroscope 104 and described data collecting card 105 and described computing machine 101 by data line.
The acoustic parametric arrays 103 of using in the present embodiment and signal processor 102 adopt 24 inches audio spotlight ultrasound transducer arrays (24-in diameter Audio Spotlight ultrasonic transducer array) and the processing amplifier (Processor/Amplifier) supporting with it of being produced by U.S. Holosonics company, the PDV-100 LASER DOPPLER VIBROMETER that the NI-PXI multichannel data acquisition system that data collecting card adopts American National instrument (NI) company limited to produce, Doppler's vibroscope adopt German Polytec company to produce.
Embodiment two: referring to Fig. 2, this earth's surface specific acoustic impedance non-contact measurement method adopts the measurement device of embodiment one to calculate ground surface sound impedence rate, and measuring process is as follows:
(1) make acoustic parametric arrays 103 sounding ports aim at landscape position 107 to be measured;
(2) sound meter 106 is put in landscape position 107 to be measured, and makes sound meter 106 by wire connection data capture card 105 and computing machine 101;
(3) sending difference frequency by computing machine 101 is
f 0Two row high_frequency sine wave signals, successively by sending the sinusoidal sound wave of high directivity by acoustic parametric arrays 103 behind data collecting card 105 and the signal processor 102;
(4) change distance and the direction of acoustic parametric arrays 103 landscape position 107 relatively to be measured, measure frequency to sound meter 106 and be
f 0And sound pressure level reaches the sound wave of maximum value, and records the maximum value of this sound pressure level in computing machine 101.
Distance and the direction of connection, parameter setting and acoustic parametric arrays 103 landscape position 107 relatively to be measured of the acoustic emission system that (5) keeps computing machine 101, data collecting card 105, signal processor 102 to be connected with acoustic parametric arrays consisting of are constant, namely keep sound meter 106 at the frequency of sound wave that landscape position 107 to be measured detects to be
f 0And sound pressure level reaches maximum value;
(6) remove sound meter 106, the earth's surface vibration detecting system that utilizes Doppler's vibroscope 104, data collecting card 105 and computing machine 101 to consist of is measured the earth's surface vibration velocity of landscape position 107 to be measured, by computing machine 101 records;
(7) the earth's surface vibration velocity at the sound pressure level maximum value at required landscape position to be measured 107 places and landscape position to be measured 107 places that survey is asked ratio, namely get landscape position 107 to be measured and be in the excitation frequency of sound wave and be
f 0The time ground surface sound impedence rate.
Claims (2)
1. ground surface sound impedence rate non-contact measurement device for measuring, comprise computing machine (101), signal processor (102), acoustic parametric arrays (103), Doppler's vibroscope (104), data collecting card (105) and sound meter (106), it is characterized in that: described computing machine (101) connects described data collecting card (105), described signal processor (102) and described acoustic parametric arrays (103) by wire successively, consists of the acoustic emission system; Described sound meter (106) and described data collecting card (105) be connected computing machine (101) and be connected by data line, consist of the sonic detection system; By described Doppler's vibroscope (104) and described data collecting card (105) be connected computing machine (101) and be connected by data line, consist of the earth's surface vibration detecting system.
2. a ground surface sound impedence rate non-contact measurement method adopts ground surface sound impedence rate non-contact measurement device for measuring according to claim 1 to measure calculating, it is characterized in that measuring process is as follows:
(1) make acoustic parametric arrays (103) sounding port aim at landscape position to be measured (107);
(2) sound meter (106) is positioned over landscape position to be measured (107), and makes sound meter (106) by wire connection data capture card (105) and computing machine (101);
(3) sending difference frequency by computing machine (101) is
f 0Two row high_frequency sine wave signals, successively by sending the sinusoidal sound wave of high directivity by acoustic parametric arrays (103) behind data collecting card (105) and the signal processor (102);
(4) change distance and the direction of acoustic parametric arrays (103) landscape position relatively to be measured (107), measure frequency to sound meter (106) and be
f 0And sound pressure level reaches the sound wave of maximum value, and records the maximum value of this sound pressure level in computing machine (101);
(5) keeping computing machine (101), data collecting card (105), signal processor (102) to be connected 103 with acoustic parametric arrays) distance and the direction of connection, parameter setting and acoustic parametric arrays (103) landscape position relatively to be measured (107) of the acoustic emission system of formation be constant, namely keeps sound meter (106) at the frequency of sound wave that landscape position to be measured (107) detects to be
f 0And sound pressure level reaches maximum value;
(6) remove sound meter (106), the earth's surface vibration detecting system that utilizes Doppler's vibroscope (104), data collecting card (105) and computing machine (101) to consist of is measured the earth's surface vibration velocity of landscape position to be measured (107), by computing machine (101) record;
(7) the earth's surface vibration velocity that the sound pressure level maximum value of the landscape position to be measured (107) of surveying being located and the landscape position to be measured (107) of surveying are located is asked ratio, namely gets landscape position to be measured (107) and is in the excitation frequency of sound wave and is
f 0The time ground surface sound impedence rate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995283A (en) * | 2014-05-12 | 2014-08-20 | 上海大学 | Sound-seismic coupling efficiency measuring device and measuring method |
| CN104931130A (en) * | 2015-06-16 | 2015-09-23 | 中国气象科学研究院 | Data acquisition and transmission instrument and data acquisition and recognition system |
| CN106370293A (en) * | 2016-11-04 | 2017-02-01 | 山西大学 | Measurement system and decomposition method for integral sound vibration and firmware vibration of violin |
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| CN102435298A (en) * | 2011-10-13 | 2012-05-02 | 上海大学 | Ground surface sound impedence rate measuring device and method |
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| CN102435298A (en) * | 2011-10-13 | 2012-05-02 | 上海大学 | Ground surface sound impedence rate measuring device and method |
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| 王驰: "基于声-地震耦合的声波探雷模型研究", 《中国博士学位论文全文数据库 基础科学辑》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995283A (en) * | 2014-05-12 | 2014-08-20 | 上海大学 | Sound-seismic coupling efficiency measuring device and measuring method |
| CN104931130A (en) * | 2015-06-16 | 2015-09-23 | 中国气象科学研究院 | Data acquisition and transmission instrument and data acquisition and recognition system |
| CN106370293A (en) * | 2016-11-04 | 2017-02-01 | 山西大学 | Measurement system and decomposition method for integral sound vibration and firmware vibration of violin |
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Application publication date: 20130403 |