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(Left) Paul Benkeser, a bioacoustics graduate at the University of Illinois, is preparing to determine the ultrasonic field of a phased array transducer. Such transducers are used to obtain acoustical "images" for use in medical diagnosis.
(Right) Jian Zhang, a bioacoustics graduate at the University of Illinois, is assembling an ultrasonic velocimeter in preparation for determining the acoustic nonlinearity of biological media.