Fiber optic displacement measuring system for high-temperature seismic sensor

Wolfgang Ecke; Peter Pfeifer; Johannes Schauer; Reinhardt Willsch; Karl-Heinz Jackel

doi:10.1117/12.255364

25 October 1996 Fiber optic displacement measuring system for high-temperature seismic sensor

Wolfgang Ecke, Peter Pfeifer, Johannes Schauer, Reinhardt Willsch, Karl-Heinz Jackel

Proceedings Volume 2839, Fiber Optic and Laser Sensors XIV; (1996) https://doi.org/10.1117/12.255364
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Wolfgang Ecke, Peter Pfeifer, Johannes Schauer, Reinhardt Willsch, and Karl-Heinz Jackel "Fiber optic displacement measuring system for high-temperature seismic sensor", Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); https://doi.org/10.1117/12.255364

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