Effects of laser source parameters on the generation of narrow band and directed laser ultrasoundPredictive and prescriptive modeling of laser arrays is performed to demonstrate the effects of the extension of array elements on laser array performance. For a repetitively pulsed laser source (the temporal laser array), efficient frequency compression is best achieved by detecting longitudinal waves off-epicenter in plates where the source size and shape directly influence the longitudinal wave shape and duration; the longitudinal array may be tailored for a given repetition frequency to yield efficient overtone energy compression into the fundamental frequency band. For phased arrays, apparent array directivity is heavily influenced by array element size.
Document ID
19930034642
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Spicer, James B. (Johns Hopkins Univ. Baltimore, MD, United States)
Deaton, John B., Jr. (Johns Hopkins Univ., Baltimore, MD; NASA, Langley Research Center Hampton, VA, United States)
Wagner, James W. (Johns Hopkins Univ. Baltimore, MD, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Review of progress in quantitative nondestructive evaluation. Vol. 11A; Proceedings of the 18th Annual Review, Brunswick, ME, July 28-Aug. 2, 1991 (A93-18576 05-38)