The Parray as an Acoustic Sensor.
Abstract
A parametric acoustic receiving array (PARRAY) can be narrowly defined as the volumetric, virtual array synthesized in the water volume between two high frequency transducers, called the pump and the hydrophone. It is instructive, however, to generalize the concept to include the high frequency transducers and associated pump signal generation and receiving electronics since the PARRAY is then analogous to a conventional acoustic sensor. Selection of optimum parameters for the generalized PARRAY is complicated by the fact that the basic parameters are not independent; however, by requiring that the total self-noise output of the PARRAY be minimized, one can develop systematic procedures for selecting optimum values for the basic parameters within the constraints of existing engineering technology. It follows that implementation of a practical and useful PARRAY for reception of low frequency acoustic signals in the ocean requires not only careful selection of system parameters but also careful design of electronic subsystem which must satisfy stringent performance requirements. To investigate the importance of the various parameters, a PARRAY with a 340 m pump-hydrophone separation was installed in the 45 m deep, freshwater environment of Lake Travis, TX, USA. Measurements were obtained over the 35 to 800 Hz frequency range demonstrating that the self-noise of the experimental PARRAY was below the ambient noise level in that environment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 07, 1980
- Accession Number
- ADA087071
Entities
People
- Tommy G. Goldsberry
Organizations
- University of Texas at Austin