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Proceedings Paper

Fiber optic displacement measuring system for high-temperature seismic sensor
Author(s): Wolfgang Ecke; Peter Pfeifer; Johannes Schauer; Reinhardt Willsch; Karl-Heinz Jackel
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Paper Abstract

Fiber optic interferometry is applied to the measurement of seismic vibrations at temperatures of about 300 degrees Celsius and several km of signal transmission lines. The measuring system consists of three orthogonal seismic receivers which are coupled via free propagating light beams to fiber optic Michelson interferometers. White light interferometry with fiber optic phase modulation in the readout interferometer is used for less than 1 micrometer resolution of absolute position of seismic mass, high- resolution monochromatic interferometry using wavelength modulation of the laser diode yields less than 0.1 nm sensitivity of seismic vibrations.

Paper Details

Date Published: 25 October 1996
PDF: 12 pages
Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); doi: 10.1117/12.255364
Show Author Affiliations
Wolfgang Ecke, Institut fuer Physikalische Hochtechnologie (Germany)
Peter Pfeifer, Institut fuer Physikalische Hochtechnologie (Germany)
Johannes Schauer, Institut fuer Physikalische Hochtechnologie (Germany)
Reinhardt Willsch, Institut fuer Physikalische Hochtechnologie (Germany)
Karl-Heinz Jackel, Geoforschungszentrum Potsdam (Germany)

Published in SPIE Proceedings Vol. 2839:
Fiber Optic and Laser Sensors XIV
Ramon P. DePaula; John W. Berthold, Editor(s)

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