抄録
In this paper, we present experimental results of an investigation of the relation between ultrasonic waveforms excited by a Q-switched pulse laser at 1064, 532, and 355 nm. As a result the 355 nm wavelength source proved best because it provides stronger impact and is most suitable for generating P-waves. Using a 532 nm source did not provide proper impact for concrete. We inspected an artificial defect in a concrete specimen using 1064 and 355 nm wavelengths of the pulse laser. The peak in opposite phase with the transmitted P-wave is used to estimate the distance of the flaw. Using the 355 nm pulse laser the result was in good agreement with the true value of the distance of the artificial defect from the specimen surface.
