Evaluation of special communications-grade fibers in interferometric and microbend sensors for measurements with ambient temperature fluctuations

Mardi C. Hastings; Bornain Chiu; Jeffrey D. Myers; Tzyy-Shuh Chang

doi:10.1117/12.141248

5 March 1993 Evaluation of special communications-grade fibers in interferometric and microbend sensors for measurements with ambient temperature fluctuations

Mardi C. Hastings, Bornain Chiu, Jeffrey D. Myers, Tzyy-Shuh Chang

Author Affiliations +

Proceedings Volume 1795, Fiber Optic and Laser Sensors X; (1993) https://doi.org/10.1117/12.141248
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

Special, relatively inexpensive communications grade fibers have been developed to minimize the effects of humidity and temperature on lightwave propagation. Two of these fibers, hermetic and dual-coat, were tested in interferometric (Mach-Zehnder type) and microbend sensing configurations. The results are compared both with theory and identical measurements using standard single-coat fiber. Axial strain (interferometer) and transverse displacement (microbend) were measured at 20 degree(s)C intervals from ambient to 80 degree(s)C. In both the interferometric and microbend configurations, only the sensing portion of the fiber was heated. The ambient relative humidity was not controlled but was monitored during the experiments. Measurements were made with displacements at frequencies up to 1 kHz. In the interferometric sensor, the static sensitivity of the hermetic and dual-coat fibers changed very little over the temperature range while the sensitivity of standard single-coat fiber decreased by 20%. Low frequency sensitivity of the microbend sensor with single-coat fiber was 40 dB higher at 80 degree(s)C relative to 20 and 40 degree(s)C, while responses measured using dual- coat and hermetic fibers were less sensitive to changes in temperature. The results indicate that fiber designed to minimize the effects of humidity and temperature on communications may be used in sensing applications to minimize or eliminate unwanted response to fluctuations in ambient temperature.

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Mardi C. Hastings, Bornain Chiu, Jeffrey D. Myers, and Tzyy-Shuh Chang "Evaluation of special communications-grade fibers in interferometric and microbend sensors for measurements with ambient temperature fluctuations", Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); https://doi.org/10.1117/12.141248

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KEYWORDS

Optical fibers

Sensors

Temperature metrology

Thin film coatings

Interferometry

Fiber optics sensors

Interferometers

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