LRAPP Vertical Array Preliminary Design Study, Phase 1
Abstract
Under contract to the Office of Naval Research, and as part of their LRAPP program, a design study was made of a vertical array that was to be suspended from a research vessel called the SPAR (Seagoing Platform for Acoustic Research). This array will be suspended from a cable at depths up to 20,000 feet to collect data on shipping noise as a function of vertical angle, depth, and frequency. The preliminary design proposes that the array be distributed over 1000 feet and that it contain 57 hydrophones geometrically spaced. The data will be collected and processed over a frequency range from 10 Hz to 333 Hz at any desired depth. A review of the literature relating to the vertical directionality of ambient noise is provided. A specific array geometry is proposed after considering several geometries and evaluating them with a computer program for a set of discrete sources. A variety of hydrophone elements are compared, and the performance of a low noise amplifier is given. The signals received by the hydrophones and the sensors are combined in an electronics package so that information can be transmitted to the surface on a single coaxial cable. Specific cables and connectors are recommended.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 14, 1972
- Accession Number
- AD0900477
Entities
People
- E. L. Shaver
- K. P. Geohegan
- Kimberly M. Wood
- P. R. Anderson
- R. U. Sims