| ABSTRACT: | PHOTO-ELASTIC VISUALISATION OF PHASED ARRAY ULTRASONIC PULSES IN SOLIDS
E.A. Ginzel1, and D. Stewart2
1 Materials Research Institute, Waterloo, Ontario, Canada; 2 Oceaneering Inspection, Aberdeen, Scotland,
United Kingdom
The first images of phased-array generated ultrasonic waves in solids are demonstrated. The only previous
imaging of phased array pulses have been carried out using medical probes transmitting into a liquid using
schlieren optical techniques. But schlieren techniques have proven inappropriate for industrial applications
due to the inability to image the shear mode of wave propagation. This presentation uses photo-elastic
imaging to illustrate the various properties of phased array probes and focal laws. Items illustrated include;
probe element integrity, wavelet formation of compression and shear modes, beam focusing and beam
steering and interaction of phase-formed wavefronts with selected targets. It is concluded that photo-elastic
visualisation is an effective tool for assessment of phased array beam forming.
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