Projectors and Hydrophones for an Acoustic Waveguide

摘要

Three projector and three hydrophone configurations have been developed to instrument three acoustic waveguides. These transducers were required to provide sufficient signal-to-noise ratio to make measurements of acoustic reflection, absorption, and transmission coefficients at pressures up to 14 MPa, temperature of 1 to 20 C, and over three frequency ranges spanning the limits of 1 to 100 kHz. The construction of the transducers is described, typical free-field calibration plots are shown, and the approximate improvement in signal-to-noise ratio is given.