Accession Number : AD0697927

Title :   THE USE OF RAY METHODS AND FIRST ORDER DIFFRACTION CORRECTIONS.

Descriptive Note : Technical memo.,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : Marsh,H. W. , Jr

Report Date : 27 SEP 1954

Pagination or Media Count : 16

Abstract : In many wave problems, ray methods are convenient and accurate. Exact in the limit of high frequency, and employing simple formulae, these methods lose utility at low frequencies or because of inadequate numerical schemes for interpreting them. Correction terms are given which permit an extension of ray methods to lower frequencies (and at the same time providing an estimation of the validity of the high frequency limit). Some useful formulae and numerical schemes for ray tracing and the quantitative evaluation of refraction (spreading) and interference are given.

Descriptors :   (*UNDERWATER SOUND, SOUND TRANSMISSION), WAVE FUNCTIONS, REFRACTION, INTERFERENCE, CORRECTIONS, DIFFRACTION

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE