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Frequency dependence of laser ultrasonic SAW phase velocities measurements

Frequency dependence of laser ultrasonic SAW phase velocities measurements

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  • Chunhui Li
  • Shaozhen Song
  • Guangying Guan
  • Ruikang K. Wang
  • Zhihong Huang

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Original languageEnglish
Pages (from-to)191-195
Number of pages5
Issue number1
StatePublished - Jan 2013


Advances in the field of laser ultrasonics have opened up new possibilities in applications in many areas. This paper verifies the relationship between phase velocities of different materials, including hard solid and soft solid, and the frequency range of SAW signal. We propose a novel approach that utilizes a low coherence interferometer to detect the laser-induced surface acoustic waves (SAWs). A Nd:YAG focused laser line-source is applied to steel, iron, plastic plates and a 3.5% agar-agar phantom. The generated SAW signals are detected by a time domain low coherence interferometry system. SAW phase velocity dispersion curves were calculated, from which the elasticity of the specimens was evaluated. The relationship between frequency content and phase velocities was analyzed. We show that the experimental results agreed well with those of the theoretical expectations.



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