Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-11-12
1994-01-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
385 12, H01J 516, H01J 4014
Patent
active
052801721
ABSTRACT:
This is a system of fibre optic sensors comprising at least one such fibre for measuring a physical or chemical parameter sensitive to the change in an environment (E) within which the sensor is placed, the said fibre comprising a cladding (3), a core (5) surrounded by this cladding, an axis (7) with a length in the direction of this axis, and, locally along its parts (9) with variations in optical thickness forming an optical diffraction grating (10), at least one part of the cladding (3) comprising in its composition an active material whose optical properties vary as a function of the change in the said parameter (P) within the environment where the sensor is placed. The active material may be a heteropolysiloxane.
REFERENCES:
patent: 4807950 (1989-02-01), Glenn et al.
patent: 4834496 (1989-05-01), Blyler, Jr. et al.
patent: 4846548 (1989-07-01), Klainer
patent: 4878015 (1989-10-01), Schmidt et al.
patent: 4996419 (1991-02-01), Morey
patent: 5138153 (1992-08-01), Gergely et al.
Lukosz, et al, "Sensitivity of Integrated Optical Grating and Prism Couplers as (bio)chemical Sensors," Sensor and Actuators, vol. 15, No. 3, Nov. 1988, pp. 273-284.
Di Bin Philippe
Facq Paul
Pichery Thierry
Allen Stephone B.
Gaz de France
Nelms David C.
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