Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-05-27
1999-02-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022714, 25022717, 385 11, 385 12, G01B 1116, G01J 902, G01L 124
Patent
active
058698353
ABSTRACT:
Fiber optic grating and etalon based fiber sensor systems are described that include an all solid state demodulation system with no moving parts. This demodulation system is based on using interference patterns generated by reflections from fiber gratings or etalons and measurements using an optical detector array. This demodulation system is applied to dual overlaid fiber optic gratings that have been written onto noncircular symmetric birefringent optical fibers. These fiber grating based sensors may be used to measure transverse strain, longitudinal strain and temperature at a single location simultaneously and their nonsymmetric nature allows accurate placement and alignment of the strain sensing axes in materials.
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Finch George W.
Lee John R.
Westin Edward P.
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