An all polarization-maintaining fiber Mach-Zehnder interferometer for simultaneous measurement of acoustic pressure and temperature is examined. Measurements by Farahi et al. (1990) indicate that the cross-sensitivity between temperature and axial strain may be significant for a polarization-maintaining fiber Fabry-Perot interferometer; however, no one has examined the significance of cross-sensitivity for the Mach-Zehnder case. Sensitivities to acoustic pressure and temperature, and the cross-sensitivity generated by simultaneous disturbances are determined both analytically and numerically. The fiber’s relatively high temperature sensitivity compared with its acoustic pressure sensitivity suggests that a short length of sensing fiber is sufficient for use as a temperature sensor with little or no interference from acoustic pressure. To measure acoustic pressure, however, a straight length of the fiber examined in this study is not sufficient. In practice, this sensing fiber could be coiled around a compliant cylinder or into a small diameter sensing element to enhance longitudinal strain and thus sensitivity. Results show that in either case, the cross-sensitivity is extremely small and can be ignored.
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July 1997
Research Papers
Analysis of a Polarization-Maintaining Optical Fiber Interferometer for Simultaneous Measurement of Acoustic Pressure and Temperature
B. Chiu,
B. Chiu
Department of Mechanical Engineering, The Ohio State University, Columbus, OH
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M. C. Hastings
M. C. Hastings
Department of Mechanical Engineering, The Ohio State University, Columbus, OH
Search for other works by this author on:
B. Chiu
Department of Mechanical Engineering, The Ohio State University, Columbus, OH
M. C. Hastings
Department of Mechanical Engineering, The Ohio State University, Columbus, OH
J. Vib. Acoust. Jul 1997, 119(3): 398-403 (6 pages)
Published Online: July 1, 1997
Article history
Received:
March 1, 1994
Revised:
August 1, 1995
Online:
February 26, 2008
Citation
Chiu, B., and Hastings, M. C. (July 1, 1997). "Analysis of a Polarization-Maintaining Optical Fiber Interferometer for Simultaneous Measurement of Acoustic Pressure and Temperature." ASME. J. Vib. Acoust. July 1997; 119(3): 398–403. https://doi.org/10.1115/1.2889737
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