Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-07-07
1998-11-24
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022714, 2502311, 385 37, H01J 516
Patent
active
058411313
ABSTRACT:
A fiber optic pressure transducer having enhanced resolution and dynamic range includes a fiber optic core having one or more gratings written onto it, a birefringence structure for enhancing the birefringence of the core, and a structure for converting isotropic pressure forces to anisotropic forces on the fiber core. Several different embodiments of prestressing structure are disclosed (both extrinsic and intrinsic). Several different embodiments of structure (both extrinsic and intrinsic) for converting isotropic pressure to anisotropic pressure are also disclosed. The fiber optic pressure transducer according to the invention is advantageously used in conjunction with a light source and a spectral demodulation system in order to detect pressure ambient to the fiber optic pressure transducer based on the wavelength and shift of spectral peaks.
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Schroeder Robert J.
Udd Eric
Gordon David P.
Le Que
Schlumberger Technology Corporation
Smith Keith G.W.
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