Accession Number : AD0694079

Title :   A METHOD FOR THE PREDICTION OF THE FARFIELD FROM NEARFIELD AMPLITUDE MEASUREMENTS OF A COHERENT SOUND FIELD.

Descriptive Note : Scientific rept.,

Corporate Author : PARKE MATHEMATICAL LABS INC CARLISLE MASS

Personal Author(s) : Butler,John L.

Report Date : OCT 1969

Pagination or Media Count : 15

Abstract : A method is presented for the prediction of the farfield from nearfield measurements of the amplitude alone of a coherent field. The method is based on a finite series wavefunction expansion for the pressure amplitude in the field. It is shown that with the expansion specialized for a coherent field there is a vast improvement over a previous general method for partially coherent fields. (Author)

Descriptors :   (*SOUND, INTENSITY), COHERENT RADIATION, MATHEMATICAL PREDICTION, SOUND TRANSMISSION, PHASE

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE