Abstract
The calibrator consists of three coaxial internally radiating piezoceramic cylinders with their ends and outside surfaces shielded. These piezoceramic cylinders terminated with coaxial metal tubes form a feed-through calibrator when suspended in an open, water-filled trough. The two outer piezoceramic cylinders produce the sound which is monitored by the central piezoceramic cylinder. The calibration procedure consists of comparing the output from a line hydrophone element located inside the central piezoceramic cylinder with the output of the piezoceramic cylinder. The purpose of the water-filled metal tubes is to provide sufficient mass reactance in order to retain a usable sound pressure level at low frequencies. The upper frequency at which this procedure is valid is determined by the lowest resonant frequency of the piezoceramic cylinders. Pertinent design considerations of the calibrator are presented, and the technique for measurement is evaluated using a calibrator as described above.
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