ELECTROACOUSTIC TRANSDUCERS FOR A 10,000-psig UNDERWATER SOUND TRANSDUCER CALIBRATION FACILITY FOR THE FREQUENCY RANGE 10 TO 4000 Hz

Abstract

The design and construction of the terminal and source transducers, a reciprocal spherical piezoelectric ceramic transducer, and the probe hiydrophones that are part of a new USRD measuring facility are described. The facility is used for the calibration of underwater sound transducers in the frequency range 10 to 4000 Hz at hydrostatic pressure to 10,000 psig and controlled temperature from 3 to 45 0 C. It operates on the principle of active-impedance termination in a rigid-walled, water-filled tube. PROBLEM STATUSThis is an interim report on the problem. PROBLEM AUTHORIZATION

The Development of a High-Power, Low-Frequency Underwater Acoustic Source for Use in a Deep-Towed Geophysical Array Section

“…Thai is, the resonance frequency is influenced by other mechanical compliances in the system such as the compliance of the piezoelectric ceramic driver, Cd. Woollett [41 identified the relationship between the cavity compliance, C', and the driver compliance, Cd, as an important design parameter and defined it as C, C- (2) Cd +C" It can be shown that for a given design, the output power is proportional to the factor (I -c2) while the viscous loss in the cavity is inversely proportional to (I -cc). Therefore, if the compliance of the driver becomes large in relation to the compliance of the cavity, the output power will decrease and the viscous loss in the cavity will increase.…”

UNDERWATER SOUNDTRANSDUCER CALIBRATION FACILITY FOR THE 10- TO 4000-Hz FREQUENCY RANGE AT HYDROSTATIC PRESSURE TO 10,000 psig

“…This report deals with the acoustic theory and the mechanical details of a second-generation calibration facility based on concepts [7,8,9] that have provided a breakthroughi in controlled-environment calibration techniques. The electronics system and the acoustical instrumentation of the new facility are reported separately [10,11].…”