Abstract
The acoustic field of simple sources is investigated by measuring the simultaneous, colocated acoustic pressure and particle acceleration with a neutrally buoyant underwater acoustic intensity vector sensor. This sensor consists of a piezoceramic hollow-cylinder pressure transducer, and a pair of miniature accelerometers mounted inside of the cylinder. A free-field calibration is performed under the ice of a flooded quarry, while in a laboratory test tank, the 2-D acoustic intensity field is mapped for various acoustic source configurations. These include a single spherical source and a pair of spherical sources that vibrate in or out of phase with each other. A sinusoidal signal of various frequencies between 2 and 20 kHz is gated in all of these experiments in order to suppress the effects of environmental reflections. The receiving beam pattern of the intensity sensor is also measured and reported. An analytical model for the interaction of two closely spaced spherical radiators is developed, and predictions from it compare well with the measured intensity field. Some limitations in the experiments, and future work are discussed. [Work supported by ONR, Code 321SS.]
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