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We compare the calculated and measured sensitivities of wide-band. ultrasonic transducers: optical interferometers. aircoupled capacitive transducers, electromagnetic acoustic transducers (EMATs), and contact piezoelectric transducers. In the case of ideal (lossless) sensors we find that air-coupled, EMAT and contact piezoelectric sensors all exhibit increased sensitivities over that of optical transducas. We then describe a procedure for measuring such sensitivity l i i t s and validate the procedure by determining the sensitivity limit of a contact piezoelectric transducer.

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