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  4. Detection of Laser Excited Surface Acoustic Waves by Infrared Radiation
 
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2000
Journal Article
Title

Detection of Laser Excited Surface Acoustic Waves by Infrared Radiation

Abstract
Remote detection of ultrasonic waves is shown experimentally by measuring the infrared (IR) radation accompanying the adiabatic propagation of surface waves. The Rayleigh waves were excited by a pulsed Nd:yttrium-aluminum-garnet laser on the surface of a steel sample at temperatures up to 700 °C. The observed time-of-flight data of the Rayleigh waves correspond to values obtained by optical interferometry and the measured signal-to noise ratio of ~0.1 agrees with the estimated value using an IR detector with a sensitivity of D*=1.7X109mm/Hz/W. Further improvements of IR detection may lead to a viable tool for laser ultrasonics.
Author(s)
Arnold, W.
Paul, M.
Kubyshkin, A.
Journal
Review of scientific instruments  
Language
English
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Keyword(s)
  • ultrasonic wave

  • infrared radiation

  • wave propagation behavior

  • interferometry

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