Optical fiber sensor

Details Optical fiber sensor Optical fiber sensor

1990-12-19

1991-11-12

Healy, Brian

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 9615, 350370, 356346, 356351, 25022717, 25023119, 73800, G02B 602, G01B 902, G01D 534, G01L 124

Patent

active

050642707

ABSTRACT:
The disclosed optical fiber sensor uses the effect of variation in the birefringence in a birefringent optical fiber as a function of the stresses and of the temperature. It has a linearly polarized, wide-spectrum source coupled to a polarizing-preserving single-mode optical fiber, along one of its neutral axes, devices capable of inducing coupling points being distributed along this fiber. A polarizer at 45.degree. with respect to the neutral axes of the fiber is placed at output of this sensor fiber. The output radiation is analyzed by spectroscopy, for example in a scanning Michelson interferometer associated with a detector. The detection by the interferometer enables the identification of the devices that are subjected to stresses. The same type of device may be used for the simultaneous detection of the stresses and/or the temperatures. The disclosed device can be applied notably to the monitoring and supervision of any installation in which strains have to be detected.

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