Abstract
Conventional two-mode fiber-optic strain sensors measure strain by inducing a path difference between the two propagating modes and spatially interfering the modal output pattern. At high strain values, the output mode pattern changes (rotates), limiting the range of measured strain. We have applied a mode separation/recombination technique and demonstrated it with a two-mode strain sensor, resulting in a rotationally invariant/stable output mode pattern and extended range of measured strain. The sensor was designed to measure strain, but with very little modification, it can measure temperature, pressure, electric and magnetic fields, etc. The improved rotationally invariant two-mode fiber-optic strain sensor performs to within 2% of standard electrical strain gauges.
© 2010 Optical Society of America
Full Article | PDF ArticleMore Like This
Serge M. Melle, Kexing Liu, and Raymond M. Measures
Appl. Opt. 32(19) 3601-3609 (1993)
Agus Muhamad Hatta, Yuliya Semenova, Qiang Wu, and Gerald Farrell
Appl. Opt. 49(3) 536-541 (2010)
Henry W. Haslach and James S. Sirkis
Appl. Opt. 30(28) 4069-4080 (1991)