Accession Number : AD0708391

Title :   APPLICATION OF HOLOGRAPHIC INTERFEROMETRY TO ANALYSIS OF SINUSOIDALLY-EXCITED ACOUSTIC TRANSDUCERS.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Griffiths,David John

Report Date : DEC 1969

Pagination or Media Count : 52

Abstract : An application of optical holography known as 'Holographic Interferometry' has been developed which enables experimentalists either to measure deformations of a few microns in loaded mechanical systems or to examine relative displacements in sinusoidally-vibrating systems. The fundamental theory of holography and four techniques for holographic interferometry are described in this report. A system constructed to record interferograms of acoustic transducers operating either in air or submerged in water is discussed and some results of examining a sinusoidally-excited 7-inch permanent-magnet loudspeaker with interferograms are considered. (Author)

Descriptors :   (*VIBRATION, MEASUREMENT), (*PHOTOGRAPHY, *INTERFEROMETERS), ELECTROACOUSTIC TRANSDUCERS, NONDESTRUCTIVE TESTING, OPTICAL INSTRUMENTS, THERMAL STABILITY, DEFORMATION, STRESSES, THESES, LASERS

Subject Categories : Lasers and Masers
      Holography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE