Accession Number : AD0645297

Title :   ACOUSTIC TRANSMISSION IN AN OCEAN SURFACE DUCT.

Descriptive Note : AWS Sonar Technology rept.

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MASS

Report Date : NOV 1966

Pagination or Media Count : 130

Abstract : Surface duct accoustical transmission measurements were performed in two areas of the Pacific Ocean. Three frequencies, three transmitter depths and three receiver depths were employed. Both areas demonstrated a persistent surface duct but they differed in that one water mass was stable and the other unstable. Experimental transmission loss curves gave good agreement with theoretical curves based upon normal mode theory. It was not possible to distinguish between the acoustic properties of the two areas either by the experimental transmission loss data or by an analysis of the observed signal variability.

Descriptors :   (*SOUND TRANSMISSION, UNDERWATER SOUND), (*UNDERWATER SOUND, PACIFIC OCEAN), DUCTS, STABILITY, SONAR RECEIVERS, SONAR PROJECTORS, SONAR SIGNALS, HYDROPHONES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE