Accession Number:

ADA270694

Title:

MAS Bulletin. New Acoustic Tide Gauge Tested

Descriptive Note:

Military applications summary bulletin.

Corporate Author:

OFFICE OF NAVAL RESEARCH EUROPEAN OFFICE FPO NEW YORK 09510

Personal Author(s):

Report Date:

1989-03-10

Pagination or Media Count:

1.0

Abstract:

The new tide gauge is a direct development from an underwater sonar system. The transducer, though employed in air, is designed primarily as an underwater device, and contains seven piston-type resonators operating at 53 kHz. These give a 3-dB down beamwidth of 4 degrees larger transducers are available where large tidal variations and rough weather are expected. The associated electronics consist of a high power transmitter which provides a 1-kW pulse every 16th of a second under computer control. The receiver has a fixed gain of 40 dB and a computer-controlled gain of 80 dB in 2.5-dB steps. The received echo is demodulated and passed to a threshold circuit which provides a fast edge for measurement of the elapsed time between the transmission and the receipt of the echo. This timing function is performed by the 8-bit microprocessor which controls all the system functions.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE