Optical fiber sensors

Details Optical fiber sensors Optical fiber sensors

1987-06-10

1988-06-07

Lee, John

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250227, 350 9619, 350 9629, G02B 626

Patent

active

047492465

ABSTRACT:
A distributed optical fiber sensor cable, for sensing perturbations such as pressure, comprises a length of optical fiber (10) and means adapted, in response to the perturbation to be sensed, to mechanically deform separate portions of the length of the fiber at sensing elements (11,12,13) periodically along their length in order to cause optical power launched into a mode of propagation in the core (14) and guided thereby to be coupled to an unguided mode, for example a cladding (15) mode. The coupling is optical wavelength selective and the separate sensing elements are each addressed with a different wavelength (.lambda..sub.11, .lambda..sub.12, .lambda..sub.13) for spatial resolution along the length of the cable.

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patent: 4586783 (1986-05-01), Campbell et al.
"Directional Couplers for Multimode Optical Fibres"; L. Jeunhomme and J. P. Pocholle; Applied Physics Letters; vol. 29, No. 8, Oct. 15th, 1976.
F. Gfeller, "Electroacoustic Transducers for Optical Fiber Modulator and Tap", IBM Technical Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, pp. 813-814.

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