MAS Bulletin. New Acoustic Tide Gauge Tested
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 1/6th 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 10, 1989
- Accession Number
- ADA270694
Entities
Organizations
- Office of Naval Research