Fiber sensor

Optics: measuring and testing – Material strain analysis – By light interference detector

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356345, 356351, G01B 902

Patent

active

047737530

ABSTRACT:
A fiber sensor for measuring temperature or strain comprises a first polarization-maintaining fiber and a second polarization-maintaining fiber. In case of a temperature fiber sensor, the first and second fibers are selected to be unequal in change in phase difference caused by change in temperature but equal in change in phase difference caused by strain. In case of a strain fiber sensor, the first and second fibers are selected to be unequal in change in phase difference caused by strain but equal in change in phase difference caused by change in temperature. Axes of polarization of the first and second fibers are shifted by 90.degree. at a junction of the fibers. With this arrangement, the temperature fiber sensor can measure the change in temperature with high accuracy without being affected by strain, while the strain fiber sensor can measure the strain with high accuracy without being affected by the change in temperature.

REFERENCES:
patent: 4495411 (1985-01-01), Rashleigh
patent: 4564289 (1986-01-01), Spillman, Jr.
patent: 4638153 (1987-01-01), Dakin
Langeac, "Temperature Sensing in Twisted Single-Mode Fibres", Electronics Letters, vol. 18, No. 24, pp. 1022-1023, 11/82.
Electronics Letters, vol. 20, No. 1, Jan. 1984, pp. 51-53, London, GB: J. P. Dakin et al: "Compensated Polarimetric Sensor Using Polarisation-Maintaining Fibre in a Differential Configuration".

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