High-temperature borehole seismometer with fiber optic displacement sensor

Gunter Borm; Wolfgang Ecke; Karl-Heinz Jaeckel; Peter Pfeifer; Johannes Schauer; Rudolf Stecher; Erhard Unterreitmeier; Reinhardt Willsch

doi:10.1117/12.345565

2 January 1998 High-temperature borehole seismometer with fiber optic displacement sensor

Gunter Borm, Wolfgang Ecke, Karl-Heinz Jaeckel, Peter Pfeifer, Johannes Schauer, Rudolf Stecher, Erhard Unterreitmeier, Reinhardt Willsch

Author Affiliations +

Proceedings Volume 3211, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96; (1998) https://doi.org/10.1117/12.345565
Event: International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96, 1996, Madras, India

Abstract

A high-temperature, high sensitive borehole seismometer with fibre optic interferometric displacement sensors has been constructed and practically tested Its parameters are suited for monitoring of seismic vibrations at working temperatures from 20°C to 300°C. Long term stability of performance characteristics has been confirmed for the seismic receiver and the fibre optic components at elevated temperatures and for several km of fibre optic signal transmission lines. Seismic vibrations could be monitored by coupling the seismic mass via spherical reflectors to a single-mode fibre optic Michelson interferometer. Optical phase processing based on wavelength modulation of tuneable DFB laser source yields <0. 1nm sensitivity of seismic vibrations within 0.1. .30Hz information bandwidth. Laboratory test measurements at elevated temperatures agree well with the results of an electrodynamic seismometer.

Citation Download Citation

Gunter Borm, Wolfgang Ecke, Karl-Heinz Jaeckel, Peter Pfeifer, Johannes Schauer, Rudolf Stecher, Erhard Unterreitmeier, and Reinhardt Willsch "High-temperature borehole seismometer with fiber optic displacement sensor", Proc. SPIE 3211, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96, (2 January 1998); https://doi.org/10.1117/12.345565

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