Title :
Simultaneous measurement of two strain components using 3×3 and 2×2 coupler-based passive demodulation of optical fiber sensors
Author :
Sirkis, James S. ; Lo, Yu-Lung
Author_Institution :
Dept. of Mech. Eng., Maryland Univ., College Park, MD, USA
fDate :
12/1/1994 12:00:00 AM
Abstract :
This paper uses 3-3 and 2-2 coupler passive demodulation of combined Michelson and polarimetric optical fiber sensors to simultaneously measure axial and transverse strain components in a single optical fiber sensor. The separated Michelson and polarimetric signals are used with isothermal Michelson and polarimetric phase strain models to provide two independent equations describing the strain in the fiber. These equations provide enough information to simultaneously calculate axial and transverse strains in surface mounted sensors. Experiments performed on vibrating cantilever beams show good agreement with measurements made with resistance strain gauges
Keywords :
Michelson interferometers; demodulation; fibre optic sensors; light interferometers; optical modulation; polarimeters; strain gauges; strain measurement; surface mount technology; vibrations; 2×2; 3×3; Michelson optical fiber sensors; axial strains; coupler-based; independent equations; isothermal Michelson; optical fiber sensors; passive demodulation; polarimetric optical fiber sensors; polarimetric phase strain models; resistance strain gauges; simultaneous measurement; strain components; surface mounted sensors; transverse strains; vibrating cantilever beams; Capacitive sensors; Demodulation; Equations; Isothermal processes; Optical coupling; Optical fiber sensors; Performance evaluation; Strain measurement; Structural beams; Surface resistance;
Journal_Title :
Lightwave Technology, Journal of
