Application of holographic interferometry to analysis of sinusoidally-excited acoustic transducers.
Griffiths, David John
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An application of optical holography known as "Holographic Inter ferometry" has been developed which enables experimentalists either to measure deformations of a few microns in loaded mechanical systems or to examine relative displacements in s inusoidally-vibrat ing systems. The fundamental theory of holography and four techniques for holographic inter - ferometry are described in this report. A system constructed to record inter fer ograms of acoustic transducers operating either in air or submerged in water is discussed and some results of examining a s inusoidally-excited 7-inch permanentmagnet loudspeaker with in ter fer ograms are considered.
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