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Accession Number:
ADA067400
Title:
Versatile Experimental Kevlar Array Hydrophones: USRD Type H78
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON DC
Report Date:
1979-04-05
Abstract:
The development and design of prototype hydrophones for the Versatile Experimental Kevlar Array VEKA, a distributed-sensor suspended cable system, and a 32-channel Shipboard Acoustic Receiving Amplifier SARA is presented. The approach was to design hydrophones which are specifically made an integral part of the free-flooded compliant cable during fabrication. The array design required the hydrophones to be mounted coaxially within the strength members of the cable and electrical conductors. The hydrophone is a high-sensitivity low- self-noise design. The design includes a custom-made hybrid microelectronic preamplifier mounted within the acoustic sensor element. The preamplifier uses a current-mode line driver to send the electrical signal up the VEKA cable to the SARA, where the signal is converted to a voltage and amplified prior to signal processing. Milestones of the hydrophone development were design of a preamplifier system capable of driving 9200 m of cable in either a voltage or current mode two-wire system development and application of hybrid microelectronic circuits to noise-measuring hydrophones and design of a unique remote switching circuit to provide calibration functions, hydrophone output signals, and hydrophone power on a two-wire system.
Descriptive Note:
Final rept. 1971-1975
Supplementary Note:
DOI: 10.21236/ADA067400
Pages:
0068
File Size:
2.48MB
