Employing 532 nm Wavelength in a Laser Ultrasound Interferometer Based on Photorefractive Polymer Composites

Saeid Zamiri^1,2, Bernhard Reitinger², Mario-Alejandro Rodríguez-Rivera³, Gabriel Ramos-Ortíz³, Peter Burgholzer^1,2, Siegfried Bauer⁴, José-Luis Maldonado³

¹Christian Doppler Laboratory for Photo Acoustic Imaging and Laser Ultrasonics, Linz, Austria.
²Research Center for Non Destructive Testing GmbH (RECENDT), Linz, Austria.
³Centro de Investigaciones en óptica A.C., León, México.
⁴Department of Soft Matter Physics, Johannes Kepler Universität, Linz, Austria.

DOI: 10.4236/oalib.1101247                

Abstract

Laser ultrasonic (LUS) receivers based on photorefractive (PR) materials are contactless and adaptive interferometers, which are used widely for materials characterization. Here, we present a simple LUS interferometer at 532 nm operating wavelength based on organic PR polymer composites (PVK/ECZ/C₆₀) doped with the nonlinear chromophore 4-[4-(diethylamino)-2-hydroxyben-zylideneamino] benzonitrile (Dc). A picoseconds laser at 1064 nm wavelength is used to generate ultrasound pulses in aluminum plates and by using this LUS polymer interferometer, detection of these ultrasound waves is remotely performed at the surface of the specimens. The LUS sensor is used to determine the thickness of aluminum plates about 0.25 mm, 3 mm and 10 mm. We also show the potential of this polymer receiver for detection of an artificial defect in a metal sample.

Keywords

Laser Ultrasonic, Photorefractive (PR) Materials, Polymer Composites

Conflicts of Interest

The authors declare no conflicts of interest.

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