Arnold, W.W.ArnoldPaul, M.M.PaulKubyshkin, A.A.Kubyshkin2022-03-032022-03-032000https://publica.fraunhofer.de/handle/publica/196860Remote 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.enultrasonic waveinfrared radiationwave propagation behaviorinterferometry620658670681journal article