Abstract
The USRD type E8 transducer was operated as an acoustic parametric source, and its performance as such was measured in two separate laboratory experiments and at sea. The parametric source was driven by a primary signal that consisted either of two high-frequency components or of an amplitude-modulated high-frequency carrier. The primary signal was centered at the transducer resonance frequency near 1.4 MHz, and the observed difference frequencies ranged from 20 to 200 kHz. During typical operation the primary electrical signal had a total power of approximately 6 W, and a difference-frequency signal at 50 kHz had a source level of about 154 dB re 1 μPa m. This paper describes the design and performance of the parametric source. It also presents a sequence of radiation patterns and values of beamwidth that illustrate difference-frequency beam formation in the nearfield of the parametric source.
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