High-Speed Focus Scanning by an Acoustic Variable-Focus Liquid Lens

The high-speed scanning of a focal point by a variable-focus liquid lens is discussed. We have investigated a high-speed variable-focus liquid lens using acoustic radiation force. It consists of a cylindrical aluminum cell with a diameter of 6 mm and a thickness of 3 mm filled with water, silicone o...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2011-07, Vol.50 (7), p.07HE26-07HE26-5
Main Authors: Koyama, Daisuke, Isago, Ryoichi, Nakamura, Kentaro
Format: Article
Language:English
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Summary:The high-speed scanning of a focal point by a variable-focus liquid lens is discussed. We have investigated a high-speed variable-focus liquid lens using acoustic radiation force. It consists of a cylindrical aluminum cell with a diameter of 6 mm and a thickness of 3 mm filled with water, silicone oil, and an ultrasound transducer. The oil--water interface can be deformed and the focal point can be changed by controlling input voltage. By exciting with an amplitude modulation (AM) signal, the vibration on the oil--water interface synchronized with the modulation wave was generated. The vibration displacement amplitude decreased with an inverse proportion of $f^{0.66}$ over 100 Hz, which is close to the resonance frequency of the lens. The path of the laser beam transmitted through the lens was calculated by ray-tracing simulations. The lens could scan at focal lengths of from 7.0 to 14.5 mm at 1 kHz in the axial direction.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.50.07HE26