Moving coil type dual-parameter geophone and detection system

Abstract

The invention provides a moving coil type dual-parameter geophone and a detection system. The moving coil type dual-parameter geophone includes a sensor and a feedback circuit. The sensor collects seismic signals. The working modes of the sensor include a first mode and a second mode. In the first mode, the sensor collects high and medium frequency seismic signals. In the second mode, the sensor collects medium and low frequency seismic signals. The feedback circuit switches the modes of the sensor. The moving coil type dual-parameter geophone has a capability of detecting signals corresponding to speeds and a capability of detecting signals corresponding acceleration at the same time.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a moving-coil dual-parameter geophone and a geophone system. Background technique [0002] Geophones are sensors used to detect ground motion. According to the different output signals of geophones, geophones can be divided into velocity type geophones and acceleration type geophones. In a velocity-type geophone, the output voltage is proportional to the ground particle velocity, and the frequency response is flat in the velocity domain. In an acceleration detector, the output voltage is proportional to the ground particle acceleration, and the frequency response is flat in the acceleration domain. [0003] The moving coil geophone is the most widely used geophone at present, and the traditional moving coil geophone is the velocity type geophone. Due to the limitation of the inherent mechanical system, this speed detector has defects such as low sensitivity and narrow frequen...

AI Technical Summary

Problems solved by technology

Due to the limitations of the inherent mechanical system, this speed detector has defects such as low sensitivity and narrow frequency band (>10Hz)

[0004] By designing and adding different feedback circuits, the system transfer function of the traditional velocity detector can be changed, making it more sensitive to the signals corresponding to the acceleration in the middle and low frequencies, and showing a band pass in the middle and low frequencies (3-100Hz). characteristics, greatly improving the amplitude-frequency response of the system, but its disadvantage is that it has a band-rejection characteristic at high frequencies (>100Hz), and cannot simultaneously have the ability to detect signals corresponding to speed and the ability to detect signals corresponding to acceleration

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