Ultra-high sensitivity transducer with chirped bragg grating rel

Details Ultra-high sensitivity transducer with chirped bragg grating rel Ultra-high sensitivity transducer with chirped bragg grating rel

1995-09-29

1998-01-06

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356354, G01C 308, G01B 1102

Patent

active

057060797

ABSTRACT:
A transducer and measurement system includes a fiber Bragg grating which a regular variation of spacing of partially reflecting surfaces, known as a chirp, either formed or induced therein and which is capable of reflecting energy having a predetermined wavelength. When the fiber Bragg grating is subjected to a strain, such as by a change in dimension or shape of a transducing element to which it is attached with change of a physical parameter to which the transducing element or the fiber Bragg grating is exposed, the location within the fiber Bragg grating which effectively reflects the predetermined wavelength will be formed (e.g. when the chirp is induced) or altered as the strain alters spacing of partially reflecting surface within the fiber Bragg grating allowing long optical fibers, such as are used in magnetometers and hydrophones, to be simulated with short optical fibers including a fiber Bragg grating.

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