Optical fiber seismic acquisition system

Abstract

The invention discloses an optical fiber seismic acquisition system, which comprises a seismic recorder, an optical fiber demodulator, an optical fiber main cable and a plurality of optical fiber acquisition chains, the optical fiber acquisition chains are arranged at corresponding positions along the optical fiber main cable so as to acquire seismic wave signals; the optical fiber demodulator is connected with the optical fiber main cable and is used for extracting seismic signals based on the optical signals uploaded by the optical fiber main cable through the optical fiber acquisition chains; and the seismic recorder is connected with the optical fiber demodulator and is used for recording the seismic wave signals extracted by the optical fiber demodulator. The earthquake acquisition system only needs to supply power to the optical fiber demodulator and the earthquake recorder, the power supply difficulty is greatly reduced, and due to the fact that optical signals are transmitted in the optical fibers, the anti-electromagnetic interference capacity is high.

Description

technical field [0001] The invention relates to seismic signal detection technology, in particular to an optical fiber seismic acquisition system. Background technique [0002] At present, seismic data acquisition equipment with dynamic coil as the mainstream has problems such as power supply difficulties, large electromagnetic interference, and slow data transmission, which limit the development of seismic exploration technology to a certain extent. [0003] The seismic data acquisition system based on the moving coil principle is composed of a moving coil detector, an acquisition station, a cross station, a power station, a transmission cable (referred to as "big line"), and a central recording system. Among them, the moving coil detector is used to be sensitive to the seismic waves generated by the excitation of the seismic source and the formation emission; the acquisition station is used to realize the acquisition of seismic signals from analog to digital; the cross sta...

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Problems solved by technology

[0004] Since the seismic data acquisition system based on the moving coil principle realizes the conversion from vibration to electrical signal through the mechanism of electromagnetic induction, key equipment such as geophones, acquisition stations, and cross stations all need power supply, and the transmission of large lines is also electrical signals, which are subject to communication The mode is limited, and the transmission speed is not fast

Therefore, seismic data acquisition equipment with moving coil as the mainstream has problems such as power supply difficulties, large electromagnetic interference, and slow data transmission, which limit the development of seismic exploration technology to a certain extent.

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