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Application of Nondestructive Testing Techniques to Materials Testing.
Annual rept. 1 Jan-31 Dec 85,
STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
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A range of fundamentally new optical nondestructive techniques has been demonstrated for measurements of surface defects, range, surface profiles and acoustic and thermal displacements of a surface. A wide aperture acoustic beam has been demonstrated to measure range to a far greater accuracy than with conventional NDT systems using short pulses. The range resolution of such a lens is comparable to a wavelength while that for a short pulse system is, at best, two or three wavelengths. Optical methods, developed during the program, have been successful in measuring film thicknesses to an accuracy of an order if 200A.
APPROVED FOR PUBLIC RELEASE