Optics: measuring and testing – By light interference – Having light beams of different frequencies
Reexamination Certificate
2006-06-06
2006-06-06
Toatley, Gregory (Department: 2877)
Optics: measuring and testing
By light interference
Having light beams of different frequencies
C356S503000, C356S504000, C356S477000
Reexamination Certificate
active
07057735
ABSTRACT:
A method and apparatus for measuring the optical thickness and absolute physical thickness of an optically transparent object utilizes a reflective interferometric process. A broadband optical signal is directed toward the object to be measured, and a pair of signals reflected off of the object are processed to determine the optical thickness of the object. When used with an optical fiber preform, the technique can be used to measure the outer diameter of the preform and control the drawing process. If the index of refraction of optically transparent object is known, the absolute physical thickness can also be determined.
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A. Ashkin, J.M. Dziedzic, R. H. Stolen, “Outer Diameter Measurement of Low Birefringence Optical Fibers by a New Resonant Backscatter Technique” Applied Optics, Jul. 1, 1981, vol. 20, No. 13.
Detschel Marissa J
Fitel U.S.A. Corp.
Toatley Gregory
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