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Proceedings Paper

Microstructure Fiber-Tip Sensor With Spectral Encoding
Author(s): P. Sixt; L. Falco; P. Dierauer; H. W. Lehmann
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Paper Abstract

Two of the main practical difficulties met by fibre point sensors where the measurand acts on the optical signal by means of a membrane or a cantilever are on one hand the thermal and mechanical stability as well as the vulnerability, and, on the other hand, the optical power referencing. Both problems have been solved here by designing a monolithic low order reflection Fabry-Perot microstructure using fibre tip dielectric and metallic mirrors. The suitably designed optical transfer function of the Fabry-Perot can easily be separated from the transfer function of the multimode fibre lead within the optical bandwidth of a cheap light emitting diode. This approach lends itself to batch fabrication and assembling with sensitivity and dynamic range adjustable by controlling the geometrical and technological parameters of planar photolithographic techniques and etching processes. A pressure sensor with 128 resolvable points within a 30 nm spectral width centered at 830 nm is described.

Paper Details

Date Published: 23 February 1989
PDF: 8 pages
Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949317
Show Author Affiliations
P. Sixt, Centre Suisse d'Electronique et de Microtechnique S.A. (Switzerland)
L. Falco, Centre Suisse d'Electronique et de Microtechnique S.A. (Switzerland)
P. Dierauer, Engineer School, Biel (Switzerland)
H. W. Lehmann, Paul Scherrer Institute (Switzerland)

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

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