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6 June 1997 Ultrahigh-sensitivity strain sensing using fiber cavity etalons
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Joseph Friebele, Martin A. Putnam, Alan D. Kersey, A. S. Greenblatt, Gregory P. Ruthven, Michael H. Krim, and Kenneth S. Gottschalck "Ultrahigh-sensitivity strain sensing using fiber cavity etalons", Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997);

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