Passive piezoelectric geophone movement, and passive piezoelectric detector based on the same

Abstract

The invention discloses a passive piezoelectric geophone movement, and a passive piezoelectric detector based on the same. The passive piezoelectric geophone movement includes a ceramic mounting ring, wherein a ceramic chip each is arranged on the upper and lower surfaces of the ceramic mounting ring respectively; each ceramic chip is double-sided positive and negative bonded ceramic on a substrate; a medium hole is formed in the substrate; a mass body is fixed on the upper ceramic chip through a screw; the lower ceramic chip is fastened on a pedestal through a screw; each screw is provided with an insulating bush which is used for preventing occurrence of short circuit between the screw and the substrate of the ceramic chip; an internal housing is rotationally arranged on the pedestal; a round hole is formed above the internal housing and is used for threading out a positive and negative pole lead; and the positive and negative pole lead of each ceramic chip is threaded out from the round hole above the internal housing. The passive piezoelectric geophone movement, and the passive piezoelectric detector based on the same have the characteristics of being high in sensitivity, being effective in frequency band width and being high in signal to noise ratio.

Description

Technical field [0001] The invention belongs to the field of passive piezoelectric geophones, and relates to a passive piezoelectric geophone core and a passive piezoelectric geophone based on the core. Background technique [0002] Seismic exploration method has always been the most important exploration method in petroleum geophysical exploration industry. This method is to bury the geophone in the ground, extract the formation vibration information through artificial earthquake and send it to the seismograph, and then the digital seismograph converts the information into geological structure information through data processing. It can be seen that the source of this information is the geophone, and the amount of information that the geophone can receive directly affects the amount of geological structure information that can be finally obtained. [0003] At present, moving coil geophones are the most widely used at home and abroad, but due to the structure of this geophone, it ...

AI Technical Summary

Problems solved by technology

According to public literature reports, Chinese patent literature inquiries and petroleum geophysical prospecting market, none of the few passive piezoelectric detectors can completely overcome the following defects: low sensitivity and low conversion efficiency of impedance matching devices , the frequency band is not wide enough, the anti-drop performance is poor, and the signal-to-noise ratio is not high, etc.

(3) The contradiction between sensitivity and bandwidth

(4) The drop resistance problem caused by the brittleness of ceramics

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