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:

1973-11-01

Pagination or Media Count:

73.0

Abstract:

Time Average holographic interferograms of a 5 x 5 array of ANSQS-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