Title :
A variable-loop Sagnac interferometer for distributed impact sensing
Author_Institution :
Telecommun. & Inf. Sci. Lab., Kansas Univ., Lawrence, KS, USA
fDate :
10/1/1996 12:00:00 AM
Abstract :
A variable-loop fiber optic Sagnac interferometer is designed to locate a time-varying disturbance. Phase perturbation on a Sagnac loop produces a nonreciprocal phase signal which contains information of the perturbation location. Both location and amplitude of the perturbation can be determined by combining two phase signals from the variable-loop Sagnac interferometer. Spatial resolution better than 1 m has been demonstrated in a 180 m prototype system
Keywords :
fibre optic sensors; impact (mechanical); light interferometers; mechanical variables measurement; optical signal detection; 180 m; distributed impact sensing; fiber optic Sagnac interferometer; nonreciprocal phase signal; perturbation location; phase perturbation; spatial resolution; time-varying disturbance; variable-loop Sagnac interferometer; High speed optical techniques; Light scattering; Optical interferometry; Optical pumping; Optical receivers; Optical scattering; Optical sensors; Optical signal processing; Phase modulation; Sagnac interferometers;
Journal_Title :
Lightwave Technology, Journal of
