8 April 1996 Laser processing quality control by laser-excited SAW with IR detection (LSAW-IRD)
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The new method of nondestructive remote control of laser processing quality is proposed. The subjects of control are structure, material properties and defects in near surface layers, modified by laser action just after laser processing (welding, heat treatment etc.). The proposed technique includes the laser excitation of surface acoustic waves (SAW) and their scattering in the processing area. For the remote registration of SAW the novel method is proposed. It's based on the detection of IR radiation arising due to temperature variation in SAW. Theoretical foundation of this technique is developed. The estimates show the reliability of LSAW-IRD. The advantage of scheme proposed is the ability to investigate rough surfaces in remote manner, as well as it possible compatibility with laser processing units.
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Alexander A. Karabutov, Alexander P. Kubyshkin, Vladislav Ya. Panchenko, "Laser processing quality control by laser-excited SAW with IR detection (LSAW-IRD)", Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); doi: 10.1117/12.237723; https://doi.org/10.1117/12.237723

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