Ground surface sound impedence rate measuring device and method

A technology of acoustic impedance rate and measuring device, which is applied in the field of geophysical prospecting, can solve the problems of inability to detect surface vibration at the same time, low detection efficiency of the surface vibration speed detection system, etc., achieve rapid detection and improve performance

Inactive Publication Date: 2012-05-02
SHANGHAI UNIV
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Problems solved by technology

[0004] A typical surface acoustic impedance rate measurement device should include an acoustic emission system and a surface vibration velocity detection system. However, the current acoustic emission system cannot directly measure the change curve of surface sound pressure, and the detection efficiency of the surface vibration velocity detection system is low. Detect vibrations at multiple locations on the earth's surface. This invention is aimed at this key technology.

Method used

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  • Ground surface sound impedence rate measuring device and method
  • Ground surface sound impedence rate measuring device and method
  • Ground surface sound impedence rate measuring device and method

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Effect test

Embodiment 1

[0029] Embodiment one : see figure 1 , the structure of the local surface acoustic impedance rate measuring device used for detecting the sound pressure level of the surface to be tested includes a signal generator (101), a mixing console (102), a power amplifier (103), a loudspeaker (104), and a sound level meter (105) and computer (107), characterized in that: the signal generator (101), mixer (102), power amplifier (103) and loudspeaker (104) are sequentially connected by wires to form a sound wave emission system, the The sound level meter (105) and the computer (107) are connected through a data line to form a sound pressure level detection system.

Embodiment 2

[0030] Embodiment two : see figure 1 , the local surface acoustic impedance rate measurement method, adopting the device measurement of embodiment one to calculate the required surface sound pressure level amplitude-frequency characteristic curve of the surface acoustic impedance rate, it is characterized in that the measurement steps are as follows:

[0031] (1) Make the sound port of the speaker (104) face the position of the surface to be measured (106);

[0032] (2) Place the sound level meter (105) on the surface to be tested (106) and directly below the sound port of the speaker (104);

[0033] (3) The signal generator (101) sends out a frequency of f 0 The initial sine wave signal is amplified by the mixer (102) and the power amplifier (103) in turn, and then the speaker (104) emits a high-intensity sine wave;

[0034] (4) The sound level meter (105) measures the sound pressure level at the position of the ground surface (106) to be measured, and records it by the ...

Embodiment 3

[0037] Embodiment three : see figure 2 , the structure of the local surface acoustic impedance rate measuring device used to measure the surface vibration velocity includes a signal generator (101), a mixing console (102), a power amplifier (103), a loudspeaker (104), a sound level meter (105), Computer (107), geophone array (201) and multi-channel data acquisition unit (202), characterized in that: the signal generator (101), mixer (102), power amplifier (103) and loudspeaker ( 104) An acoustic wave emission system is formed by connecting wires in sequence, and the geophone array (201), multi-channel data acquisition unit (202) and computer (107) are connected sequentially by data wires to form a surface vibration velocity detection system.

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Abstract

The invention discloses a ground surface sound impedence rate measuring device and a ground surface sound impedence rate measuring method. The device comprises a sound wave emission system, a device for detecting a sound pressure level of the ground surface to be tested, and a device for detecting a vibration speed of the ground surface to be tested, wherein the sound wave emission system comprises a signal generator, a sound console, a power amplifier, a loudspeaker, a sound level meter and a computer; the device for detecting the sound pressure level of the ground surface to be tested comprises a sound wave emission system, a sound level meter and a computer; and the device for detecting the vibration speed of the ground surface to be tested comprises a sound wave emission system, a seismic detector array, a multi-channel data acquisition unit and a computer. The sound wave emission system emits high-intensity low-frequency sound waves, the device for detecting the sound pressure level detects a sound pressure level of the ground surface to be tested, the device for detecting the vibration speed of the ground surface detects a vibration speed on the ground surface, and a ratio of the sound pressure level and the vibration speed on the ground surface is a ground surface sound impedence rate. By the ground surface sound impedence rate measuring device and the ground surface sound impedence rate measuring method, the ground surface sound impedence rate can be quickly measured at high accuracy.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H15/00G01V7/00
Inventor 王驰于瀛洁周瑜秋方臣张之江
Owner SHANGHAI UNIV
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