Abstract
We present two laser ultrasonic receivers based on organic photorefractive polymer composites with 2-[4-bis(2-methoxyethyl)aminobenzylidene]malononitrile (AODCST) or 2-dicyanomethylen-3-cyano-5,5-dimethyl-4-(4′-dihexylaminophenyl)-2,5-dihydrofuran nonlinear optical chromophores. Experimental results show sensitivities of the ultrasonic receivers of ~9.5 × 10−8 nm (W/Hz)0.5 for both composites, and a faster response time (~60 ms) for the AODCST-based laser ultrasonic receiver. We show that such LUS detectors are highly suitable for contactless thickness measurements of aluminum, steel sheets and defect detection with an accuracy of 100 μm.
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Acknowledgments
This work has been supported by the Christian Doppler Research Association, the K-Project for Non-Destructive Testing and Tomography supported by the COMET-Program of the Austrian Research Promotion Agency (FFG), Grant No. 820492, the European Regional Development Fund (EFRE) in the framework of the EU-program Regio 13 and the federal state of Upper Austria. We are also indebted to Spanish MINECO and Comunidad Valenciana for funding (projects CTQ2010-20349 and PROMETEO/2012/010).
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Zamiri, S., Reitinger, B., Portenkirchner, E. et al. Laser ultrasonic receivers based on organic photorefractive polymer composites. Appl. Phys. B 114, 509–515 (2014). https://doi.org/10.1007/s00340-013-5554-7
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DOI: https://doi.org/10.1007/s00340-013-5554-7