Laser ultrasonic TOFD method

Mihara, Tsuyoshi; Ohtsuka, Y.; Cho, H.; Yamanaka, Kazuhiro

doi:10.1063/1.1373767

Cited by 3 publications

(1 citation statement)

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“…Recently, a few techniques to size surfacebreaking cracks have been proposed by using laser-generated surface wave [3][4][5], although these can be useful only for the shallower cracks, say a depth of less than a few mm, in principle. TOFD technique combined with laser-ultrasonics has been also attempted by using surface-skimming wave [6] and bulk waves [7]. These successes are however limited by relatively poor sensitivity of the laser-based detection systems.…”

Section: Introductionmentioning

confidence: 99%

Laser Ultrasonic Study of Crack Tip Diffraction

Ochiai¹,

Lévesque²,

Talbot³

et al. 2003

AIP Conference Proceedings

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Ultrasonic diffraction pattern at a crack tip and crack depth sizing based on the diffraction are studied by using laser-generated bulk waves. Directivity patterns oriented essentially along the normal for the diffracted longitudinal wave and essentially at 45 (deg) for the diffracted shear wave for any incident angles is obtained. A laser-ultrasonic system combined with time-offlight (TOFD) analysis is produced and demonstrates accurate crack sizing on an artificial slot having a variable depth from 0 mm to 10 mm. An improvement of signal-to-noise ratio by split spectrum processing (SSP) is also suggested.

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