Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-06-21
1994-06-28
Messinger, Michael
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
385 12, 25022718, H01J 516
Patent
active
053249330
ABSTRACT:
An apparatus for detecting a measurand includes a fiber field access block having a clad fiber positioned in the fiber field access block such that a portion of the fiber is exposed to an outer surface and any cladding on that portion of the clad fiber is thinner than required to prevent an evanescent wave from escaping the clad fiber. A measurand sensitive layer is provided over the outer surface. A grating is present in either the measurand sensitive layer or the fiber. An optical source and an optical detection component are coupled to the clad fiber. The optical detection component measures shifts in output signals resulting from presence of the measurand in the environment of the fiber field access block caused by changing Bragg conditions which result from swelling of the measurand sensitive layer. The concentration of the measurand can be determined from the detected shifts.
REFERENCES:
patent: 4560248 (1985-12-01), Cramp et al.
patent: 4795226 (1989-01-01), Bennion et al.
patent: 4815843 (1989-03-01), Tiefenthaler et al.
patent: 4834496 (1989-05-01), Blyler, Jr. et al.
patent: 5007705 (1991-04-01), Morey et al.
patent: 5138153 (1992-08-01), Gergely et al.
Whalen et al., "Wavelength-Tunable Single-Made Fibre Grating Reflector", Electronics Letters, vol. 22, pp. 1307-1308 (1986).
"High-Reflectivity Monomode-Fibre Grating Filters", by I. Bennion, et al, Electronic Letters, vol. 22, No. 6, Mar. 1986.
"Fiber Bragg Grating Chemical Sensor", by G. Meltz, et al, SPIE, vol. 1587, 1991.
"Photocharge Process", by J. Gaynor, et al, Photographic Science and Engineering, vol. 11, No. 3, 1967.
"Deformation Recording Media", Encyclopedia of Chemical Technology, vol. 7, 3rd Edition, pp. 448-461, 1979.
"A Single-Mode Fiber Evanescent Grating Reflector", by W. V. Sorin, et al, Journal of Lightwave Technology, vol. LT-3, No. 5, Oct. 1985.
"Flory-Huggins Theory" [163,164], ISBN 0-387-50777-9 Polymers, 1990.
"Narrow-band Bragg Reflectors in Optical Fibers", B. S. Kawasaki, et al, Optics Letters, vol. 3, No. 2, Aug. 1978.
"Formation of Bragg gratings in optical fibers by a transverse holoraphic method", G. Meltz, et al, Optics Letters, vol. 14, No. 15, Aug. 1989.
"Grating-fiber Coupler as a High-Resolution Spectrometer", by P. St. J. Russell et al, vol. 10, No. 6, Jun. 1985, Optics Letter.
General Electric Company
Kratz Ann M.
Messinger Michael
Snyder Marvin
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