We report ultrahigh-sensitivity static strain sensing (noise equivalent strain ≤1.5n rms) by two fiber etalon cavities made from silica and fluoride fibers. The anomalous thermo-optic coefficient of fluoride glass fibers allows for determination of thermal and laser drift. This sensor is also capable of simultaneous strain and temperature measurement, with errors in strain and temperature of 6.4% and 0.68%, respectively.
© 1998 Optical Society of America
(060.2290) Fiber optics and optical communications : Fiber materials
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2400) Fiber optics and optical communications : Fiber properties
(120.6780) Instrumentation, measurement, and metrology : Temperature
(130.6010) Integrated optics : Sensors
E. J. Friebele, M. A. Putnam, H. J. Patrick, A. D. Kersey, A. S. Greenblatt, G. P. Ruthven, M. H. Krim, and K. S. Gottschalck, "Ultrahigh-sensitivity fiber-optic strain and temperature sensor," Opt. Lett. 23, 222-224 (1998)