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Proceedings Paper

Fiber Optic Sensor System Using Birefringent Filters For Spectral Encoding
Author(s): Friedhelm Dorsch; Reinhard Ulrich
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Paper Abstract

A system of multimode fiber optic sensors is described for the remote measurement of position, angle, force, pressure and other measurands that can be converted into a rotation of polarization. A birefringent filter encodes the polarization angle into the power ratio of two interleaved comb spectra or, in a modified implementation, into the absolute spectral position of a comb spectrum. By using identical filters in all transducers and in the evaluation unit, transducers for the same or different measurands become interchange-able. All sensors are of the incremental type, with accuracies reaching 0.5 % of one period of the measurand, independent of variations in the attenuation of the fiber link of up to 20dB.

Paper Details

Date Published: 23 February 1989
PDF: 9 pages
Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949318
Show Author Affiliations
Friedhelm Dorsch, Technische Universitat Hamburg-Harburg (Germany)
Reinhard Ulrich, Technische Universitat Hamburg-Harburg (Germany)

Published in SPIE Proceedings Vol. 1011:
Fiber Optic Sensors III
Ralf Th. Kersten, Editor(s)

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