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Earth surface specific acoustic impedance non-contact measurement device and method

A non-contact measurement and acoustic impedance rate 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 acoustic wave emission, etc., and achieve the effect of improving performance

Inactive Publication Date: 2013-04-03
SHANGHAI UNIV
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Problems solved by technology

[0004] A typical non-contact surface acoustic impedance measurement device should include a high-directional acoustic wave emission system and a non-contact surface vibration velocity detection system, "Research on the Effect of Landmines on Surface Acoustic Impedance", Wang Chi et al., Sensors and Microsystems, 2008 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. The surface vibration velocity detection system is based on the contact type of geophone. Velocity sensors cannot perform non-contact detection of surface vibration velocity. The present invention is aimed at this key technology.

Method used

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  • Earth surface specific acoustic impedance non-contact measurement device and method
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Embodiment 1

[0020] Embodiment one : see figure 1 , the structure of the local surface acoustic impedance rate non-contact measuring 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 passed through a wire Connect the data acquisition card 105, the signal processor 102 and the acoustic parameter array 103 to form a sound wave emission system, and the sound level meter 106 is connected with the data acquisition card 105 and the computer 101 to form a sound wave The detection system is composed of the Doppler vibrometer 104 connected with the data acquisition card 105 and the computer 101 through data lines to form a surface vibration detection system.

[0021] 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...

Embodiment 2

[0022] Embodiment two : see figure 2 , the local surface acoustic impedance rate non-contact measurement method, the device measurement and calculation of the surface acoustic impedance rate using the embodiment one, the measurement steps are as follows:

[0023] (1) Align the sounding port of the acoustic parameter array 103 with the surface position 107 to be measured;

[0024] (2) Put the sound level meter 106 at the position 107 of the ground surface to be measured, and connect the sound level meter 106 to the data acquisition card 105 and the computer 101 through wires;

[0025] (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;

[0026] (4) Change the distance and direction of the acoustic parameter array 103 relative to the surface location 107 to ...

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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 [0001] The invention relates to the technical field of geophysical prospecting, in particular to a non-contact measuring device and method for surface acoustic impedance rate in the research of acoustic wave detection of non-metallic landmines. 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 detecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H15/00
Inventor 王驰周瑜秋丁卫沈高炜吴文雯
Owner SHANGHAI UNIV
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