Title :
Fiber-optic interferometric strain gauge producing asymmetric fringes by using nonlinear feedback
Author :
Fürstenau, Norbert ; Schmidt, Walter
Author_Institution :
Inst. for Flight Guidance, German Aerospace Res. Establ., Braunschweig, Germany
fDate :
8/1/1995 12:00:00 AM
Abstract :
Source wavelength modulation by feedback of the interference signal of an unbalanced fiber-optic Michelson interferometer to the driver of the semiconductor laser source gives rise to sawtooth shaped fringes under fiber strain. The dependence of the theoretically predicted fringe asymmetry on feedback gain is verified experimentally. Elimination of the fringe counting directional ambiguity via differentiation of the asymmetric closed loop interference signal is demonstrated for the first time
Keywords :
Michelson interferometers; fibre optic sensors; optical feedback; optical fibres; optical modulation; strain gauges; asymmetric closed loop interference signal; asymmetric fringes; feedback gain; fiber strain; fringe asymmetry; fringe counting directional ambiguity; interference signal; nonlinear feedback; sawtooth shaped fringes; semiconductor laser source; source wavelength modulation; unbalanced fiber-optic Michelson interferometer; Capacitive sensors; Diode lasers; Fiber lasers; Interference elimination; Laser feedback; Optical feedback; Optical fiber cables; Optical fiber polarization; Optical interferometry; Phase measurement;
Journal_Title :
Quantum Electronics, IEEE Journal of
