Journal ArticleDOI
Optical and thermal parameter effects on laser‐generated ultrasound
K. L. Telschow,R. J. Conant +1 more
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TLDR
In this paper, the use of a pulsed laser source for the generation of elastic waves in materials is investigated, taking into account optical penetration into the material, and the shape of the precursor signal is strongly dependent on the optical and thermal properties of the material.Abstract:
The use of a pulsed laser source for the generation of elastic waves in materials is investigated, taking into account optical penetration into the material. Under appropriate conditions, a significant feature of the laser‐generated elastic waveform is a precursor (sharp spike) signaling the arrival of the longitudinal wave. The shape of this precursor signal is strongly dependent on the optical and thermal properties of the material. This paper shows that the observed precursor can be understood through the use of models that account for optical penetration and thermal diffusion into the material.read more
Citations
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Journal ArticleDOI
Line source representation for laser-generated ultrasound in aluminum
TL;DR: In this work, a laser line source was modeled and verified experimentally by measuring the ultrasonic shear wave signal generated in aluminum with a broadband laser generation/electromagnetic acoustic transducer (EMAT)-detection system.
Journal ArticleDOI
Modeling of laser thermoelastic generation of ultrasound in an orthotropic medium
TL;DR: In this paper, the authors presented a numerical model that calculates the surface displacements generated by the absorption of a laser pulse by an orthotropic medium using temporal Laplace and spatial two-dimensional Fourier transformations.
Journal ArticleDOI
Laser induced ultrasonic phased array using full matrix capture data acquisition and total focusing method.
TL;DR: In this paper, a data collection method (full matrix capture) and a post processing imaging algorithm, the total focusing method, both developed for ultrasonic arrays, are modified and used in order to enhance the capabilities of laser ultrasonics for nondestructive testing by improving defect detectability and increasing spatial resolution.
Journal ArticleDOI
Practical considerations for the rapid inspection of composite materials using laser-based ultrasound
TL;DR: In this paper, an automated laser-based ultrasound system is described that has sufficient sensitivity to detect typical flaws of interest in composite materials without causing surface damage to the part under test.
Journal ArticleDOI
Photoacoustic probes for nondestructive testing and biomedical applications
TL;DR: Fiber-optic photoacoustic sources for nondestructive testing and biomedical applications offer wide ultrasonic range, easy control over directivity of the ultrasonic beam, high efficiency of generation, and the ability to operate in a harsh environment.