Piezoelectric ceramic shallow full-wave exploration transducer

Abstract

The invention discloses a piezoelectric ceramic shallow full-wave exploration transducer. Multiple piezoelectric tubes are used to replace a piezoelectric plate to serve as an acoustoelectric conversion device inside the piezoelectric ceramic shallow full-wave exploration transducer; and the inherent frequency obtained after mass blocks and the piezoelectric tubes are combined is approximate to the frequency of an actual signal, so that receiving sensitivity is high. The multiple piezoelectric tubes are used and connected in a mechanical series connection or parallel connection mode, and therefore the inherent frequency of mechanical vibration can be adjusted to improve the receiving sensitivity. The piezoelectric tubes are connected in series or parallel through electric signals, whereinin case of series connection, the signals are added, and the voltage is large; and in case of parallel connection, currents are added, and the final current is large. By use of the transducer with thepiezoelectric tubes, electric signal amplitude in high-frequency vibration conversion is large, the frequency is high, and the resolution on a stratum is high. The transducer can effectively measurethe stratum sound velocity and wave impedance of a medium at the depth of underground shallow 10-200 meters.

Description

Technical field [0001] The invention is an instrument for measuring and evaluating wave impedance in shallow ground exploration and construction, and particularly relates to a high-density acquisition, high-frequency and high-resolution vibration transducer that can effectively measure the ground sound velocity and wave impedance of 10-200 meters in the shallow underground. Device. Background technique [0002] In the existing seismic wave exploration technology, both the transmission and reception are on the ground. The probe used has moving coil type and piezoelectric ceramic chip type. The problem with the probe is how to improve the resolution and sensitivity. The natural frequency of the moving coil probe is relatively low, only a few hundred Hz. It can only receive low-frequency signals of a few hundred hertz, but cannot receive high-frequency signals of several kilohertz. Therefore, the signal received by the probe has a longer wavelength ratio and lower resolution, whi...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the low natural frequency (500Hz) of the traditional moving coil probe and the high natural frequency (2MHz) of the piezoelectric ceramic chip probe, which is not close to the actual signal frequency (1kHz-10kHz) and has low sensitivity. Disadvantages, provide a shallow full-wave exploration transducer made of piezoelectric tubes to measure high-frequency signals from 1kHz to 10kHz

Images