Accession Number : AD0770882

Title :   Digitizing Holographic Data.

Descriptive Note : Final rept. 11 Aug 72-30 Sep 73,

Corporate Author : GENERAL ELECTRIC CO SYRACUSE N Y ELECTRONICS LAB

Personal Author(s) : Nelligan,John D.

Report Date : NOV 1973

Pagination or Media Count : 73

Abstract : Time Average holographic interferograms of a 5 x 5 array of AN/SQS-23 active sonar transducer element were subjected to digital processing in an effort to extract amplitudes of vibration as a function of face location. The degree of additional noise imputed to the data by the intermediate transparency together with the lack of a static interferogram for reference purposes renders the extraction of fringe loci by global double threshold techniques impracticable. Recommendations for successful extraction are presented. (Author)

Descriptors :   *Sonar transducers, *Holography, *Signal processing, Vibration, Interferometers, Digital systems

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE