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Proceedings Paper

High-temperature borehole seismometer with fiber optic displacement sensor
Author(s): Gunter Borm; Wolfgang Ecke; Karl-Heinz Jaeckel; Peter Pfeifer; Johannes Schauer; Rudolf Stecher; Erhard Unterreitmeier; Reinhardt Willsch
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Paper 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.

Paper Details

Date Published: 2 January 1998
PDF: 6 pages
Proc. SPIE 3211, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96, (2 January 1998); doi: 10.1117/12.345565
Show Author Affiliations
Gunter Borm, GeoForschungsZentrum Potsdam (Germany)
Wolfgang Ecke, Institute for Physical High-Technology (Germany)
Karl-Heinz Jaeckel, GeoForschungsZentrum Potsdam (Germany)
Peter Pfeifer, Institute for Physical High-Technology (Germany)
Johannes Schauer, Institute for Physical High-Technology (Germany)
Rudolf Stecher, Geoforschungszentrum Potsdam (Germany)
Erhard Unterreitmeier, Geoforschungszentrum Potsdam (Germany)
Reinhardt Willsch, Institute for Physical High-Technology (Germany)

Published in SPIE Proceedings Vol. 3211:
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96
J. P. Raina; P. R. Vaya, Editor(s)

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