초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A method for testing a transparent body for the presence of striae comprising the steps of:(a) preparing a digitized phase plot for the transparent body using an interferometer, wherein:(i) the interferometer produces a beam of light which passes through the transparent b

[ What is claimed is:] [1.] A method for testing a transparent body for the presence of striae comprising the steps of:(a) preparing a digitized phase plot for the transparent body using an interferometer, wherein:(i) the interferometer produces a beam of light which passes through the transparent body; and(ii) the digitized phase plot comprises a set of first values at a set of first locations on the body;(b) applying a high pass filter to the set of first values, said high pass filter producing a set of second values at a set of second locations on the body;(c) applying a statistical filter to the set of second values to remove outlying values, said statistical filter producing a set of third values at a set of third locations on the body;(d) column averaging the set of third values to produce a set of fourth values at the set of second locations on the body; and(e) examining the set of fourth values at the set of second locations to detect striae within the transparent body.