RECIPROCITY CALIBRATION IN A TUBE WITH ACTIVE-IMPEDANCE TERMINATION
NAVY UNDERWATER SOUND REFERENCE LAB ORLANDO FL
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A new application of the reciprocity principle has been developed for calibrating electroacoustic transducers in a closed vessel at static pressures to 8500 psi and frequencies from 100 to 1500 Hz. The necessary plane progressive wavefield is provided by sound propagation in the longitudinal mode within a sound channel terminated at both ends with active impedances. The technique is particularly well suited to the calibration of underwater-sound transducers because the high static pressure under which many of them must operate, as well as their size, mechanical construction, and operating frequency, often prevents the use of more conventional methods. The case of a rigid-walled, water-filled tube is analyzed theoretically. Results of measurements made by this method in a practical high-pressure calibration chamber are shown.
- Acoustic Detection and Detectors