The photorefractive effect of flexoelectric smectic liquid crystal mixtures was investigated and applied to a laser ultrasonic measurement. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds, and a sensitizer, are known to exhibit a fast photorefractive effect. The principle of the 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 be used to investigate the thickness and the internal structure of an object without contact.
The photorefractive effect of flexoelectric smectic liquid crystal mixtures was investigated and applied to a laser ultrasonic remote sensing. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds and a sensitizer, are known to exhibit a large photorefractive effect. The principle of the ultrasonic remote sensing is that a laser beam is irradiated on an object and the variation in the reflected light is detected by photorefractive two-beam coupling. This remote sensing method can be used to probe the internal structure of an object or to measure the thickness of a plate object without contact.
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