A photoelectric composite geophone and detection system

Abstract

A photoelectric composite geophone (1), comprising a housing (101), an optical fiber detection assembly (102) and a piezoelectric detection assembly (103). The optical fiber detection assembly (102) comprises a first compliant cylinder (1021) and a second compliant cylinder (1022), which are coaxially arranged, and a first optical fiber (1023) fixedly wound around the first compliant cylinder (1021) in a clockwise manner, and a second optical fiber (1024) fixedly wound around the second compliant cylinder (1022) in an anticlockwise manner. The piezoelectric detection assembly (103) is located between a lower end face of the first compliant cylinder (1021) and an upper end face of the second compliant cylinder (1022), and comprises a detection base (1031), a first piezoelectric piece (1032) fixedly arranged on an upper surface of the detection base (1031), a second piezoelectric piece (1033) fixedly arranged on a lower surface of the detection base (1031), and an electrical signal transmission line (1034) electrically connected to the first piezoelectric piece (1032) and the second piezoelectric piece (1033). By means of simultaneous measurement of seismic waves by combining the optical fiber detection assembly (102) with the piezoelectric detection assembly (103), the photoelectric composite geophone (1) can more accurately obtain an actual parameter of a vibration signal and has higher accuracy and credibility.

Description

technical field [0001] The invention relates to the technical field of earthquake detection, in particular to a photoelectric composite geophone and a detection system. Background technique [0002] Seismic exploration is currently one of the most commonly used physical detection methods for petroleum exploration and coal mines. It mainly uses the vibration signals generated by artificial seismic sources in the formation, and places seismometers at different positions from the seismic source to collect vibration signals, and then performs corresponding processing on the signals. data processing. [0003] Geophones are vibration sensors commonly used in seismic exploration. As the front-end equipment for signal reception and acquisition, their characteristic parameters directly affect the accuracy of seismic data acquisition results. Most of the existing geophones are electromagnetic. Electromagnetic geophones have the properties of strong resistance to external interference...

AI Technical Summary

Problems solved by technology

Most of the existing geophones are electromagnetic. Electromagnetic geophones have the properties of strong resistance to external interference, short response time, and strong linearity. The acceleration equivalent noise of existing electrical geophones or seismometers is generally in the range of μg·Hz -1 / 2 even ng·Hz -1 / 2 Below the order of magnitude, the disadvantage of electromagnetic detectors is that continuous power supply is required for measurement, and it is difficult to apply in harsh monitoring environments

The existing geophones also have optical fiber type, which can make up for the shortcomings of the electromagnetic type, but the measurement range of the optical fiber type geophone is 5-800Hz, and it is impossible to measure the vibration of rockburst (frequency 0-10Hz)

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