Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1996-09-11
1998-06-09
Font, Frank G.
Optics: measuring and testing
Material strain analysis
By light interference detector
356359, 364572, 364575, G01L 124, G01B 1100, G06G 712
Patent
active
057643458
ABSTRACT:
A process for detecting inhomogeneities, specifically, striae in a sample of fused silica glass is provided which includes the steps of: preparing a digitized phase plot for the sample using an interferometer which produces a beam of light which passes through the sample; applying a high pass filter to the phase plot to remove the effects of the sample's bulk properties; applying a statistical filter to the high pass filtered data to remove outlying data points; and column averaging the statistically filtered data. If present, striae can be readily detected in the column averaged, statistically filtered data.
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"Corning Tests for Striae in Fused Silica," Laser Focus World, p. 110, Aug. 1993.
Pfau et al., Applied Optics, vol. 31, No. 31, pp. 6658-6661 (Nov. 1, 1992).
Fladd David R.
Rieks Stephen J.
Corning Incorporated
Font Frank G.
Klee Maurice M.
Vierra-Eisenberg Jason D.
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