SOUND-MEASURING SET.

Abstract

The Sound-Measuring Set is a stable, reliable, battery- or AC-powered, small portable field instrument designed for underwater acoustic measurements at frequencies from 50 to 100,000 Hz. Ease of operation with minimum chance for error was a major design requirement. A special high-impedance, low-noise preamplifier is used with hydrophones to limit self-noise to a level equivalent to approximately that of sea state zero. The hydrophone-preamplifier assembly is designed to operate to depths exceeding 1,000 feet. The system includes an internal means for quick calibration at frequencies from 0.1 to 70 kHz, at levels from -30 to -90 dBV. Flexibility is provided by two gain paths with independent attenuators and filters that may be connected to a single hydrophone or used individually with two hydrophones. Transistors are used throughout in the circuitry. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1966
Accession Number
AD0801083

Entities

People

  • Richard L. Allman

Organizations

  • Naval Air Weapons Station China Lake

Tags

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Assembly
  • Attenuators
  • Calibration
  • Frequency
  • Hydrophones
  • Impedance
  • Low Noise
  • Measurement
  • Noise
  • Preamplifiers
  • Resilience
  • Self Noise

Readers

  • Acoustical Oceanography.
  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Electrical Engineering