Frequency dependence of laser ultrasonic SAW phase velocities measurements

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

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    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.
    Original languageEnglish
    Pages (from-to)191-195
    Number of pages5
    JournalUltrasonics
    Volume53
    Issue number1
    DOIs
    Publication statusPublished - Jan 2013

    Keywords

    • Surface acoustic wave (SAW)
    • Frequency content
    • Laser ultrasonics
    • GENERATION
    • ELASTIC PROPERTIES
    • LINE SOURCE
    • WAVES
    • CONSTANTS
    • Phase velocity
    • Young's modulus

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