Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-05-08
1997-01-07
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022714, 356 32, H01J 516
Patent
active
055919650
ABSTRACT:
Spectrally separated fiber gratings are written in substantially the same location of a birefringent optical fiber to form a multiparameter environmental sensor. This sensor is particularly useful for the measurement of three axes of strain and temperature at a single location in composite material. This is possible due to the splitting of each of the dual overwritten fiber gratings via the birefringence of the optical fiber resulting in four spectral outputs and four equations that may be solved to determine the two transverse strains, the longitudinal strain and the temperature. This invention also describes systems that may be used to demodulate the multiparameter fiber gratings.
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Finch George W.
Le Que T.
Westin Edward P.
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