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Optical Engineering

Mechanical design of embedded optical fiber interferometric sensors for monitoring simple combined loads
Author(s): Henry W. Haslach; Kristina G. Whipple
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Paper Abstract

A procedure to mathematically model and design embedded interferometric optical sensors to measure more than one load is given for the case of an axisymmetric member. This design can avoid the ill-conditioning problems of the transfer functions found in other multiparameter sensors, and the coefficients of the transfer functions are defined analytically rather than experimentally. The sensor with two active fibers, generalizing acoustical sensors, measures external radial pressure and external axial stress. The device sensitivity, which differs from optimizing the optical response of a single embedded fiber, is defined, and methods are obtained to optimize this sensitivity by adding a coating layer to each embedded fiber. The relative effect of strains that are transverse and parallel to the fiber is predicted. The effect on strain response of varying coating material properties is modeled. Strain concentrations created by the presence of the fiber are computed, and the separation required between fibers in the sensor is determined. Approximate models based on the small diameter of the fiber and its coating compared to that of the body overlook these strain concentrations. The design of an embedded fiber optic load sensor depends both on the mechanical properties of the body in which it is embedded and the loads to be monitored.

Paper Details

Date Published: 1 March 1993
PDF: 10 pages
Opt. Eng. 32(3) doi: 10.1117/12.61039
Published in: Optical Engineering Volume 32, Issue 3
Show Author Affiliations
Henry W. Haslach, Univ. of Maryland (United States)
Kristina G. Whipple, Univ. of Maryland (United States)

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