Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-10-04
1998-05-05
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250205, 356 32, H01J 516
Patent
active
057477930
ABSTRACT:
An analog, optical-fiber measuring system compensates for variations in the level of light attenuation occurring in the optical path of the measuring system. The analog, optical-fiber measuring system utilizes a "reference" light transmitted along a common optical-fiber path as the actual "sensing" light. The reference light has a wavelength which differs from the sensing light's wavelength. Effects of the variations in the level of light attenuation are eliminated by monitoring the variations in the attenuation experienced by the reference light along the common optical-fiber path and adjusting the respective intensities of the reference light and the sensing light as a function of the variations. Because the effects of the variations in the level of light attenuation are compensated by an analog scheme, accurate measurement of the selected physical parameter is insured without the need for a microprocessor. The analog, optical-fiber measuring system facilitates discrete optical fibers to be separated and reconnected without significantly affecting the integrity of the optical signal obtained via these discrete optical fibers.
REFERENCES:
patent: 4356396 (1982-10-01), Ruell et al.
patent: 4523092 (1985-06-01), Nelson
patent: 4599711 (1986-07-01), Cuomo
patent: 4703175 (1987-10-01), Salour et al.
patent: 4918492 (1990-04-01), Ferdinand et al.
patent: 4924870 (1990-05-01), Wlodarczyk et al.
patent: 4947038 (1990-08-01), Wiesmeier et al.
patent: 5004913 (1991-04-01), Kleinerman
patent: 5065010 (1991-11-01), Knute
patent: 5148303 (1992-09-01), Biard
patent: 5149963 (1992-09-01), Hassler, Jr.
patent: 5263776 (1993-11-01), Abraham et al.
patent: 5275053 (1994-01-01), Wlodarczyk et al.
patent: 5278499 (1994-01-01), Ito et al.
patent: 5307146 (1994-04-01), Porter et al.
patent: 5334831 (1994-08-01), Maurice
G. R. Petrie, K. W. Jones and R. Jones, "An Optical Fibre Sensor Array for the Measurement of Displacements of Complex Engineering Structures," SPIE vol. 586, Fiber Optic Sensors, pp. 244-249 (Jan. 1985).
Shi Weiman
Sundburg William J.
Advanced Fiber Optechs, Inc.
Dreyfus, Esq. Edward
Le Que
LandOfFree
Variable light source compensated optical fiber sensing system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable light source compensated optical fiber sensing system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable light source compensated optical fiber sensing system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-56922