Methods for detecting inhomogeneities, specifically, striae, inf

Optics: measuring and testing – Material strain analysis – By light interference detector

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356359, 364572, 364575, G01L 124, G01B 1100, G06G 712

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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.

REFERENCES:
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patent: 5133601 (1992-07-01), Cohen et al.
patent: 5416586 (1995-05-01), Tronolone et al.
patent: 5479006 (1995-12-01), Schultz
patent: 5544518 (1996-08-01), Hart et al.
"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).

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