Laser ultrasonics for measurement of the thickness of metal plates using a photorefractive liquid crystal

Takeo Sasaki; Toshinobu Takashi; Gouta Ikeda; Junko Watanabe; Miku Nagaoka; Shinnosuke Yamazaki; Yumiko Naka; Khoa Van Le

doi:10.1117/12.2664898

31 May 2023 Laser ultrasonics for measurement of the thickness of metal plates using a photorefractive liquid crystal

Takeo Sasaki, Toshinobu Takashi, Gouta Ikeda, Junko Watanabe, Miku Nagaoka, Shinnosuke Yamazaki, Yumiko Naka, Khoa Van Le

Author Affiliations +

Proceedings Volume 12574, Holography: Advances and Modern Trends VIII; 1257408 (2023) https://doi.org/10.1117/12.2664898
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

The photorefractive effect of smectic liquid crystal mixtures was investigated and the application to laser ultrasonic measurements was demonstrated. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds, and a sensitizer, exhibit a fast photorefractive effect. The principle of ultrasonic measurement is that a nanosecond laser pulse is shot on an object to cause an ultrasonic vibration, a continuous laser beam is irradiated on the object, and the ultrasonic variation is detected using photorefractive two-beam coupling. This method can investigate an object's thickness and internal structure without contact.

Conference Presentation

Citation Download Citation

Takeo Sasaki, Toshinobu Takashi, Gouta Ikeda, Junko Watanabe, Miku Nagaoka, Shinnosuke Yamazaki, Yumiko Naka, and Khoa Van Le "Laser ultrasonics for measurement of the thickness of metal plates using a photorefractive liquid crystal", Proc. SPIE 12574, Holography: Advances and Modern Trends VIII, 1257408 (31 May 2023); https://doi.org/10.1117/12.2664898

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