Nondestructive Determination of Surface Flaw Geometry by Acoustical Holography, Exploratory Development.
Final rept. 3 Jan 72-2 Jan 73,
WASHINGTON UNIV SEATTLE AEROSPACE RESEARCH LAB
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The results of experiments aimed at developing a new nondestructive method of investigating surface flaw geometry based on acoustical holography and a newly proposed liquid crystal read-out device are presented. The liquid crystal area detector was show to be feasible for use with acoustical holography however, it was not applied to the monitoring of surface flaw geometry. The method was shown to have an order of magnitude improvement in resolution capabilities however, it was found to be severely lacking in the area of sensitivity, re-sponse time, and dynamic range. A strict thermal activation of the liquid crystals by the ultrasound was found not to be the optimum. Author-PL
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods