Novel hollow-glass microsphere sensor for monitoring high hydrostatic pressure

Ming Gang Xu; John P. Dakin

doi:10.1117/12.141242

5 March 1993 Novel hollow-glass microsphere sensor for monitoring high hydrostatic pressure

Ming Gang Xu, John P. Dakin

Proceedings Volume 1795, Fiber Optic and Laser Sensors X; (1993) https://doi.org/10.1117/12.141242
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

Laboratory prototypes of a novel pressure sensor have been produced using a hollow glass microsphere, bonded, in an on-axis position, to the end of a monomode optical fiber. The sphere surfaces form a low finesse Fabry-Perot interferometer. The construction of the probe is simple in concept, yet the sensing element is intrinsically hermetically sealed. Experimental trials, under the influence of hydraulic pressure have been carried out and show a good match with predicted behavior. The observed shift in wavelength with pressure was -0.93 nm/MPa, two orders to magnitude higher than that we have measured with a in-fiber-grating sensor under similar conditions. The ratio of the pressure sensitivity to the temperature sensitivity for our microsphere sensor was more than two orders of magnitude better than the in-fiber-grating type, so therefore less compensation is necessary to correct for temperature changes. This new form of sensing probe has potential for many high-pressure sensing applications.

Citation Download Citation

Ming Gang Xu and John P. Dakin "Novel hollow-glass microsphere sensor for monitoring high hydrostatic pressure", Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); https://doi.org/10.1117/12.141242

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