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Sound-seismic coupling efficiency measuring device and measuring method

A coupling efficiency and measurement device technology, applied in the field of geophysical prospecting, can solve the problems of non-contact detection of surface vibration velocity, inability to achieve high directivity, long-distance sound wave emission, etc., and achieve the effect of improving system performance

Inactive Publication Date: 2014-08-20
SHANGHAI UNIV
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Problems solved by technology

[0004] A typical non-contact surface acoustic-seismic coupling efficiency measurement device should include a highly directional acoustic wave emission system and a non-contact surface vibration velocity detection system, "Research on the Effect of Landmines on Surface Acoustic Impedance Rate", Wang Chi et al., Sensors and Microsystems , 2008, Vol. 27, No. 8, pp. 36-38, the acoustic emission system studied is based on the sound system, which cannot achieve high directivity and long-distance sound wave emission, and the surface vibration velocity detection system is based on the geophone. The contact speed sensor cannot perform non-contact detection of the vibration speed of the ground surface. The present invention is aimed at this key technology.

Method used

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Embodiment 1

[0021] Embodiment one: see figure 1 The structure of the local surface acoustic-seismic coupling efficiency non-contact measurement device includes a computer 101, a signal processor 102, an acoustic parameter array 103, a Doppler vibrometer 104, a data acquisition card 105 and a sound level meter 106, and the computer 101 is sequentially Connect the data acquisition card 105, the signal processor 102 and the acoustic parameter array 103 through a data line to form an acoustic emission system; The computer 101 constitutes a sound pressure level detection system; the Doppler vibrometer 104 is sequentially connected to the data acquisition card 105 and the computer 101 through a data line to constitute a surface vibration detection system.

[0022] The acoustic parameter array 103 and the signal processor 102 used in this embodiment adopt the 24-in diameter Audio Spotlight ultrasonic transducer array (24-in diameter Audio Spotlight ultrasonic transducer array) produced by the Am...

Embodiment 2

[0023] Embodiment two: see figure 2 , the local surface acoustic-seismic coupling efficiency non-contact measurement method, adopting the device of embodiment one to measure and calculate the surface acoustic-seismic coupling efficiency, the measurement steps are as follows:

[0024] (1) Align the sounding port of the acoustic parameter array 103 of the sound wave emission system with the surface position 107 to be measured;

[0025] (2) Place the sound level meter 106 of the sound pressure level detection system at the position 107 on the ground surface to be measured;

[0026] (3) The difference frequency sent by the computer 101 is f 0 The two columns of high-frequency sine wave signals pass through the data acquisition card 105 and the signal processor 102 in turn, and the acoustic parameter array 103 sends out a high-directivity sine wave;

[0027] (4) Change the distance and direction of the acoustic parameter array 103 relative to the surface location 107 to be meas...

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Abstract

The invention discloses a sound-seismic coupling efficiency measuring device and measuring method. The device comprises a sound wave transmitting system, a to-be-measured ground surface sound wave detecting device and a to-be-measured ground surface vibration speed detecting device. The sound wave transmitting system comprises a computer, a data collecting card, a signal processing amplifier and an acoustic parametric array, the to-be-measured ground surface sound wave detecting device comprises the sound wave transmitting system, a sound level meter and the computer, the to-be-measured ground surface vibration speed detecting device comprises the sound wave transmitting system, a Doppler vibrometer, the data collecting card and the computer, the sound wave transmitting system sends out high-frequency sound waves with the high directivity, low-frequency sound waves are generated on the to-be-measured ground surface, a sound pressure level detecting device detects the sound pressure level of the to-be-measured ground surface, a ground surface vibration speed detecting device detects the vibration speed of the to-be-measured ground surface, and the ratio of the measured vibration speed at the ground surface to the sound pressure level is the sound-seismic coupling efficiency. The non-contact, high-precision and rapid measuring of the sound-seismic coupling efficiency can be achieved.

Description

technical field [0001] The invention relates to the technical field of geophysical prospecting, in particular to a non-contact measuring device and method for surface acoustic-seismic coupling efficiency in the research of acoustic wave detection of non-metallic mines. Background technique [0002] The safe and reliable detection of plastic and other non-metal mines has always been a bottleneck problem that needs to be solved urgently in the international demining cause. Commonly used metal detectors can only detect metal landmines because they are based on the principle of electromagnetic induction, and have poor detection effects on non-metal mines such as plastics with little metal content. For imaging technologies such as infrared, ground penetrating radar, and X-ray, it is difficult to distinguish whether buried objects are landmines in terms of detection mechanism; for non-imaging technologies, such as neutron analysis, it has a strong ability to identify landmines by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01V1/28
Inventor 王驰张芳曹源吴文雯丁卫
Owner SHANGHAI UNIV
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