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Proceedings Paper

Novel hollow-glass microsphere sensor for monitoring high hydrostatic pressure
Author(s): Ming Gang Xu; John P. Dakin
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Paper 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.

Paper Details

Date Published: 5 March 1993
PDF: 6 pages
Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); doi: 10.1117/12.141242
Show Author Affiliations
Ming Gang Xu, Univ. of Southampton (United Kingdom)
John P. Dakin, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 1795:
Fiber Optic and Laser Sensors X
Eric Udd; Ramon P. DePaula, Editor(s)

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