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Proceedings Paper

Ultrahigh-sensitivity strain sensing using fiber cavity etalons
Author(s): E. Joseph Friebele; Martin A. Putnam; Alan D. Kersey; A. S. Greenblatt; Gregory P. Ruthven; Michael H. Krim; Kenneth S. Gottschalck
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Paper Abstract

Ultrahigh sensitivity strain sensors are required for precision applications where length changes on the order of nanometers must be detected. Using a single mode fiber as a cavity etalon, a new, ultrahigh sensitivity optical fiber sensor has been developed. The sensor is fabricated by gold- coating the cleaved ends of approximately 1 m long single mode fiber to form a moderate finesse (F approximately equals 50) fiber cavity etalon. The sensor has demonstrated static strain sensitivity of approximately 1 n(epsilon) and low frequency noise performance of approximately 4 p(epsilon) /(root)Hz at 10 Hz. The results of quasi-static stepped strain (< 50 n(epsilon) ) and free vibration dynamic strain measurements of these sensors bonded to low expansion struts will be reported.

Paper Details

Date Published: 6 June 1997
PDF: 11 pages
Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997); doi: 10.1117/12.275728
Show Author Affiliations
E. Joseph Friebele, Naval Research Lab. (United States)
Martin A. Putnam, Naval Research Lab. (United States)
Alan D. Kersey, Naval Research Lab. (United States)
A. S. Greenblatt, Naval Research Lab. (United States)
Gregory P. Ruthven, Hughes Danbury Optical Systems (United States)
Michael H. Krim, Hughes Danbury Optical Systems (United States)
Kenneth S. Gottschalck, Hughes Danbury Optical Systems (United States)

Published in SPIE Proceedings Vol. 3042:
Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation
Richard O. Claus, Editor(s)

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