Measurement of absolute acoustic nonlinearity parameter using laser-ultrasonic detection

Seong Hyun Park, Jongbeom Kim, Dong Gi Song, Sungho Choi, Kyung Young Jhang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The absolute acoustic nonlinearity parameter β is defined by the displacement amplitudes of the fundamental and second-order harmonic frequency components of the ultrasonic wave propagating through the material. As β is a sensitive index for the micro-damage interior of industrial components at early stages, its measurement methods have been actively investigated. This study proposes a laser-ultrasonic detection method to measure β. This method provides (1) the β measurement in a noncontact and nondestructive manner, (2) inspection ability of different materials without complex calibration owing to direct ultrasonic displacement detection, and (3) applicability for the general milling machined surfaces of components owing to the use of a laser interferometer based on two-wave mixing in the photorefractive crystal. The performance of the proposed method is validated using copper and 6061 aluminum alloy specimens with sub-micrometer surface roughness. The experimental results demonstrated that the β values measured by the proposed method for the two specimens were consistent with those obtained by the conventional piezoelectric detection method and the range of previously published values.

Original languageEnglish
Article number4175
JournalApplied Sciences (Switzerland)
Issue number9
StatePublished - 2021


  • 6061 aluminum alloys
  • Absolute acoustic nonlinearity parameter
  • Copper
  • Laser-ultrasonic detection
  • Nonlinear ultrasonics
  • Photorefractive interferometer


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