Accession Number:

AD0756176

Title:

Adaptation of the NRL Acoustic Research Tank Facility for Experiments in Parametric Sonar, with Preliminary Results

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1973-01-29

Pagination or Media Count:

30.0

Abstract:

The NRL Acoustic Research Tank Facility, with its capability for obtaining numerical planar scans and graphic recordings of radiation patterns, has been adapted for use in parametric sonar studies. In a preliminary set of experiments, the facility was used to study difference-frequency radiation from an acoustic parametric source. The source used a USRD type E8 transducer, driven simultaneously at two frequencies close to the resonance frequency of 1.5 MHz. This report describes the experimental apparatus and illustrates the flexibility of the tank facility as a research tool in nonlinear acoustics. It also presents measured values of the difference-frequency sound pressure level and a sequence of radiation patterns that illustrates beam formation in the near field of the parametric source.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE