Computer Techniques for Ultrasonic Inspection.

This paper will describe two prototype ultrasonic inspection systems developed in-house at the Army Materials and Mechanics Research Center (AMMRC). Both systems incorporate computers for data acquisition and analysis purposes. The first inspection instrument uses a 64-element transducer array and is capable of inspecting artillery shell rotating bands for unbonds at high inspection rates (less than 10 seconds per shell). The second instrument is designed to measure the nonmetallic inclusion content in steel billets. Steel 'cleanliness' measurements are important when high quality steel is required for critical gears and bearings in aircraft engines. (Author)