CN103018767A - Acousto-optical detection device and method for shallow buried objects - Google Patents
Acousto-optical detection device and method for shallow buried objects Download PDFInfo
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- CN103018767A CN103018767A CN2012105321940A CN201210532194A CN103018767A CN 103018767 A CN103018767 A CN 103018767A CN 2012105321940 A CN2012105321940 A CN 2012105321940A CN 201210532194 A CN201210532194 A CN 201210532194A CN 103018767 A CN103018767 A CN 103018767A
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Abstract
The invention discloses an acousto-optical detection device and a method for shallow buried objects. The acousto-optical detection device comprises an acoustic wave emission system and a to-be-detected earth surface vibration detection device, wherein the acoustic wave emission system comprises a computer, a data acquisition card (DAQ), a signal process amplifier and an acoustic parametric array; and the to-be-detected earth surface vibration detection device comprises an acoustic wave emission system, a laser Doppler vibrometer, a DAQ and a computer. The acoustic wave emission system emits high-directivity high-frequency acoustic waves and generates low-frequency acoustic waves at positions of to-be-detected earth surfaces, and the earth surface vibration detection device detects vibration displacement change conditions at the positions of the to-be-detected earth surfaces. By means of the acousto-optical detection device and the method, non-contact, high-accuracy and rapid measurement for shallow underground buried objects can be achieved.
Description
Technical field
The present invention relates to the geophysical prospecting technology field, especially acoustic detector and the method in the underground buried target detection of shallow-layer.
Background technology
An international bottleneck problem such as underground safety, the reliable detection of burying thing of the shallow-layers such as nonmetallic mine always.Metal detector commonly used can only be surveyed metal material system and buries thing 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, impalpable is buried the type of thing on detection mechanism; For non-imaging technique, such 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 is in the application feasibility demonstration stage.
Acoustic sounding technology based on sound-earthquake coupling principle refers to when low-frequency sound wave incides the earth's surface by air, can excite the vibration on earth's surface, and form the seismic event of the Multiple components such as fast compressional wave, slow compressional wave and shear wave, reflection or scattering phenomenon can occur as running into treasure trove in these seismic events, change the ANOMALOUS VARIATIONS of earth's surface vibrational state.Therefore, by detecting the variation abnormality situation of earth's surface vibrational state, can be used for the underground research of burying the object space face of shallow-layer.Acoustic sounding technology based on sound-earthquake coupling principle has potential application prospect, buries the thing experimental provision but lack commercial acoustic sounding shallow-layer.
A typical shallow-layer is buried quality testing and is surveyed acoustic emission system and the noncontact earth's surface vibration detecting system that device should comprise high directivity, and the acoustic emission system of research is many based on high-power sound system at present, can not accomplish high directivity, remote acoustic emission, the earth's surface vibration detecting system is based on this contact speed pickup of seismoreceiver, can not carry out the non-contact detecting of earth's surface vibrational state, the present invention launches for this gordian technique just.
Summary of the invention
The object of the invention is to overcome and there is no at present the special-purpose underground problem of burying the aspects such as measurement mechanism of thing mechanism research of acoustic sounding shallow-layer, provide the underground quality testing of burying of a kind of contactless shallow-layer to survey device and detection method, can realize underground object height precision, the non-cpntact measurement fast of burying of shallow-layer.
For achieving the above object, the present invention adopts following technical proposals:
A kind of shallow-layer is buried thing sound and light detecting device, comprise computing machine, signal processor, acoustic parametric arrays, LASER DOPPLER VIBROMETER and data acquisition system (DAS), described computing machine connects described data acquisition system (DAS), described signal processor and described acoustic parametric arrays by wire successively, the high directivity acoustic emission system that consists of, the earth's surface vibration detecting system that described computing machine and described LASER DOPPLER VIBROMETER and described data acquisition system (DAS) consist of.
A kind of shallow-layer is buried thing sound and light detecting method, above-mentioned pick-up unit, and the implementation step is:
A nothing of (1) acoustic parametric arrays sounding port being aimed at ground to be measured is buried the thing reference position, and the axis of acoustic parametric arrays sounding port and the angle of level ground are 45 degree;
(2) nothing on LASER DOPPLER VIBROMETER perpendicular alignmnet ground to be measured is buried the thing reference position, launch the detection beam signal;
(3) sending frequency by computing machine is
f 1With
f 2Two row high_frequency sine wave signals,
f 1With
f 2Frequency difference be low frequency
f 0, frequency is
f 1With
f 2Two row high_frequency sine wave signals send the sinusoidal sound wave of high directivity by acoustic parametric arrays after amplifying by the conditioning of data acquisition system (DAS) and signal processor successively, and bury the thing reference position in the nothing on ground to be measured and inspire frequency and be
f 0Earth's surface vibration;
(4) nothing that the earth's surface vibration detecting system that utilizes LASER DOPPLER VIBROMETER, data acquisition system (DAS) and computing machine to consist of is measured ground to be measured is buried the earth's surface vibration displacement amplitude of thing reference position
d 1, by computer recording;
(5) keep the high directivity acoustic emission system described in step (1)-(4) and the parameter of earth's surface vibration detecting system to arrange constant, acoustic parametric arrays in the high directivity acoustic emission system is moved in the horizontal direction, inspire frequency to the position to be measured on ground to be measured and be
f 0Earth's surface vibration;
(6) LASER DOPPLER VIBROMETER in the vibration detecting system of earth's surface is moved in the horizontal direction, incide the position to be measured on ground to be measured to the detection light beam of Vertical Launch, detect earth's surface vibration displacement amplitude
d 2
The nothing on the ground to be measured of (7) relatively surveying is buried the earth's surface vibration displacement amplitude of thing reference position
d 1Earth's surface vibration displacement amplitude with the position to be measured on the ground to be measured of surveying
d 2If, displacement amplitude
d 1And displacement amplitude
d 2Difference is larger, then illustrates to exist below the position to be measured on ground to be measured to bury thing.
The present invention compared with prior art, having following apparent outstanding substantive distinguishing features is connected with remarkable advantage computing machine, data acquisition system (DAS), 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 multichannel data acquisition system.
Description of drawings
Fig. 1 is that shallow-layer of the present invention is buried thing sound and light detecting apparatus structure synoptic diagram;
Fig. 2 is that shallow-layer is buried thing sound and light detecting 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 that this shallow-layer is buried thing sound and light detecting device comprises computing machine 101, signal processor 102, acoustic parametric arrays 103, LASER DOPPLER VIBROMETER 104 and data acquisition system (DAS) 105, described computing machine 101 connects described data acquisition system (DAS) 105, described signal processor 102 and described acoustic parametric arrays 103 by wire successively, the high directivity acoustic emission system that consists of, the earth's surface vibration detecting system that described computing machine 101 and described LASER DOPPLER VIBROMETER 104 and described data acquisition system (DAS) 105 consist of.
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 acquisition system adopted American National instrument (NI) company limited produces, Doppler's vibroscope adopt German Polytec company to produce.
Embodiment two
Referring to Fig. 2, this shallow-layer is buried thing sound and light detecting method, adopts the device of embodiment one to detect, and detecting step is as follows:
A nothing of (1) acoustic parametric arrays 103 sounding ports being aimed at ground to be measured is buried thing reference position 106, and the axis of acoustic parametric arrays 103 sounding ports and the angle of level ground are 45 degree;
(2) nothing on LASER DOPPLER VIBROMETER 104 perpendicular alignmnets ground to be measured is buried thing reference position 106, launch the detection beam signal;
(3) sending frequency by computing machine 101 is
f 1With
f 2Two row high_frequency sine wave signals,
f 1With
f 2Frequency difference be low frequency
f 0, frequency is
f 1With
f 2Two row high_frequency sine wave signals send the sinusoidal sound wave of high directivity by acoustic parametric arrays 103 after amplifying by 102 conditionings of data acquisition system (DAS) 105 and signal processor successively, and bury thing reference position 106 in the nothing on ground to be measured and inspire frequency and be
f 0Earth's surface vibration;
(4) nothing that the earth's surface vibration detecting system that utilizes LASER DOPPLER VIBROMETER 104, data acquisition system (DAS) 105 and computing machine 101 to consist of is measured ground to be measured is buried the earth's surface vibration displacement amplitude of thing reference position 106
d 1, by computing machine 101 records;
(5) keep the high directivity acoustic emission system described in step (1)-(4) and the parameter of earth's surface vibration detecting system to arrange constant, acoustic parametric arrays 103 in the high directivity acoustic emission system is moved in the horizontal direction, inspire frequency to 107 places, position to be measured on ground to be measured and be
f 0Earth's surface vibration;
(6) LASER DOPPLER VIBROMETER 104 in the vibration detecting system of earth's surface is moved in the horizontal direction, incide the position to be measured 107 on ground to be measured to the detection light beam of Vertical Launch, detect earth's surface vibration displacement amplitude
d 2
The nothing on the ground to be measured of (7) relatively surveying is buried the earth's surface vibration displacement amplitude of thing reference position 106
d 1Earth's surface vibration displacement amplitude with the position to be measured on the ground to be measured of surveying
d 2If, displacement amplitude
d 1And displacement amplitude
d 2Difference is larger, then illustrates to exist below the position to be measured on ground to be measured to bury thing.
Claims (2)
1. a shallow-layer is buried thing sound and light detecting device, it is characterized in that, comprise computing machine (101), signal processor (102), acoustic parametric arrays (103), LASER DOPPLER VIBROMETER (104) and data acquisition system (DAS) (105), described computing machine (101) connects described data acquisition system (DAS) (105) by wire successively, described signal processor (102) and described acoustic parametric arrays (103), the high directivity acoustic emission system that consists of, the earth's surface vibration detecting system that described computing machine (101) and described LASER DOPPLER VIBROMETER (104) and described data acquisition system (DAS) (105) consist of.
2. a shallow-layer is buried thing sound and light detecting method, adopts by pick-up unit claimed in claim 1, it is characterized in that the implementation step is:
A nothing of (1) acoustic parametric arrays (103) sounding port being aimed at ground to be measured is buried thing reference position (106), and the axis of acoustic parametric arrays (103) sounding port and the angle of level ground are 45 degree;
(2) nothing on LASER DOPPLER VIBROMETER (104) perpendicular alignmnet ground to be measured is buried thing reference position (106), launch the detection beam signal;
(3) sending frequency by computing machine (101) is
f 1With
f 2Two row high_frequency sine wave signals,
f 1With
f 2Frequency difference be low frequency
f 0, frequency is
f 1With
f 2Two row high_frequency sine wave signals send the sinusoidal sound wave of high directivity by acoustic parametric arrays (103) after amplifying by the conditioning of data acquisition system (DAS) (105) and signal processor (102) successively, and bury thing reference position (106) in the nothing on ground to be measured and inspire frequency and be
f 0Earth's surface vibration;
(4) nothing that the earth's surface vibration detecting system that utilizes LASER DOPPLER VIBROMETER (104), data acquisition system (DAS) (105) and computing machine (101) to consist of is measured ground to be measured is buried the earth's surface vibration displacement amplitude of thing reference position (106)
d 1, by computing machine (101) record;
(5) keep the high directivity acoustic emission system described in step (1)-(4) and the parameter of earth's surface vibration detecting system to arrange constant, acoustic parametric arrays (103) in the high directivity acoustic emission system is moved in the horizontal direction, locate to inspire frequency to the position to be measured (107) on ground to be measured and be
f 0Earth's surface vibration;
(6) LASER DOPPLER VIBROMETER in the vibration detecting system of earth's surface (104) is moved in the horizontal direction, incide the position to be measured (107) on ground to be measured to the detection light beam of Vertical Launch, detect earth's surface vibration displacement amplitude
d 2
The nothing on the ground to be measured of (7) relatively surveying is buried the earth's surface vibration displacement amplitude of thing reference position (106)
d 1Earth's surface vibration displacement amplitude with the position to be measured on the ground to be measured of surveying
d 2If, displacement amplitude
d 1And displacement amplitude
d 2Difference is larger, then illustrates to exist below the position to be measured on ground to be measured to bury thing.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106596728A (en) * | 2016-11-05 | 2017-04-26 | 上海大学 | High-directivity low-frequency sound wave transmission and measurement device and method |
CN110109125A (en) * | 2019-05-16 | 2019-08-09 | 中国科学院声学研究所东海研究站 | Spherical surface focusing Phased Parametric Array acoustic detection device |
CN110133098A (en) * | 2019-04-02 | 2019-08-16 | 中国人民解放军63983部队 | A kind of high precision measuring device and measurement method of land mine sound vibration characteristic |
CN110261888A (en) * | 2019-04-02 | 2019-09-20 | 上海大学 | A kind of the fast sound-light detection device and detection method of mine |
CN113534287A (en) * | 2021-06-23 | 2021-10-22 | 上海大学 | All-weather sound-light mine detection device and method |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106596728A (en) * | 2016-11-05 | 2017-04-26 | 上海大学 | High-directivity low-frequency sound wave transmission and measurement device and method |
CN110133098A (en) * | 2019-04-02 | 2019-08-16 | 中国人民解放军63983部队 | A kind of high precision measuring device and measurement method of land mine sound vibration characteristic |
CN110261888A (en) * | 2019-04-02 | 2019-09-20 | 上海大学 | A kind of the fast sound-light detection device and detection method of mine |
CN110109125A (en) * | 2019-05-16 | 2019-08-09 | 中国科学院声学研究所东海研究站 | Spherical surface focusing Phased Parametric Array acoustic detection device |
CN110109125B (en) * | 2019-05-16 | 2021-04-30 | 中国科学院声学研究所东海研究站 | Spherical focusing phased parametric array acoustic detection device |
CN113534287A (en) * | 2021-06-23 | 2021-10-22 | 上海大学 | All-weather sound-light mine detection device and method |
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