Optics: measuring and testing – Of light reflection – By comparison
Patent
1992-10-22
1994-06-28
Rosenberg, Richard A.
Optics: measuring and testing
Of light reflection
By comparison
G01N 2155
Patent
active
053251814
ABSTRACT:
A hulling optical bridge includes light means for supplying light and splitter means for splitting the light into a first light beam and a second light beam. The first light beam is directed to a surface having a parameter to be measured, and a first photodetector receives light reflected from or transmitted through the surface and generates a first signal indicative of the magnitude of the reflected or transmitted light. A second photodetector receives the second light beam and generates a second signal indicative of the magnitude of the second light beam. An electronic balancing circuit operates in a first mode when the parameter is maintained at a constant level, for adjusting the first and second signals to equal magnitudes, and operates in a second mode when the parameter varies, for applying a compensating signal to the first signal to balance the first and second signals. Further, a monitor is provided which is responsive to the magnitude of the compensating signal for indicating the magnitude of the parameter.
REFERENCES:
patent: 3703337 (1972-11-01), Neugroschel
patent: 3743430 (1973-07-01), Riggs
patent: 4211488 (1980-07-01), Kleinknecht
patent: 4350441 (1982-09-01), Wicnieski
patent: 4908508 (1990-03-01), Dubbeldam
patent: 4933567 (1990-06-01), Silva
patent: 5022765 (1991-06-01), Guidotti
patent: 5108185 (1992-04-01), Mansuripur
"An Optical Bridge Reflectometer for Sensitive Measurements of Ion Implantation Dose" by D. Guidotti, PACS: 06.70 Dn 42.80-f.
"Novel and Nonintrusive Optical Thermometer" by Daniel Guidotti, IBM Thomas J. Watson Research Center, Appl. Phys. Lett. 60(5), Feb. 3, 1992.
International Business Machines - Corporation
Lau Richard
Rosenberg Richard A.
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