Abstract
An all polarization-maintaining fiber Mach-Zehnder interferometer has been developed for simultaneous measurement of strain or acoustic pressure and temperature. The two forcefully maintained polarization states act as two separate interferometric sensors. In this study, longitudinal strain and heat were applied to the same portion of the fiber to experimentally evaluate cross-sensitivity effects created by simultaneous application. Experimental measurements using a passive homodyne demodulation scheme based on a 3 X 3 coupler agree well with those predicted by a finite element model of the fiber. In addition, response of the interferometer to simultaneous disturbances of acoustic pressure and temperature were calculated. Results of this study show that the cross-sensitivity is negligible and may be ignored for the fiber examined in this study. Furthermore, simultaneous measurement of temperature with another desired measurand has potential to eliminate measurement errors and limitations on resolution that currently limit the use of fiber interferometers in industrial and structural applications.
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