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| Presentation | 2011-07-28 14:10 Three-dimensional focus scanning by a liquid lens using acoustic radiation force Daisuke Koyama, Ryoichi Isago, Kentaro Nakamura (Tokyo Tech)  US2011-28 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | A liquid lens was fabricated whose focal point can be varied in the axial and radial directions. We have been developing a variable-focus liquid lens that employs acoustic radiation force and does not contain any mechanical moving parts. Our liquid lens is more compact and has a faster response than conventional mechanical lenses. Rapid scanning of its focus at 1 kHz has been realized by exciting by an amplitude modulation signal. The liquid lens consists of a cylindrical acrylic cell (inner diameter: 10 mm; thickness: 3 mm), two immiscible liquids with different refractive indices (water and silicone oil), and an annular piezoelectric lead zirconate titanate transducer with four electrodes. The oil-water interface functions as a lens surface and it can be deformed by the acoustic radiation force generated by the transducer; this enables the lens to act as a variable-focus lens. The variation of the oil-water interface was observed by optical coherence tomography. The laser beam path through the lens was calculated by ray-tracing simulations. The oil-water interface could be deformed and its focal point could be varied in three dimensions by controlling the input voltages of the PZT electrodes. The displacement angle in the radial direction was approximately 3$^\circ$ when two of the electrodes were excited by an input voltage of 45 V at a frequency of 1.9 MHz. The dynamic performance of the lens was investigated using a high-speed camera. Exciting by AM signals with a phase difference caused the hemispherical water droplet to oscillate, enabling the focus to be scanned in the axial and radial directions. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | variable-focus lens / confocal image / liquid lens / acoustic radiation force / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 111, no. 158, US2011-28, pp. 33-38, July 2011. | |
| Paper # | US2011-28 | |
| Date of Issue | 2011-07-21 (US) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | US2011-28 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2011-07-28 - 2011-07-29 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kyoto Electronics Manufacturing Co., Ltd. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Material Proparty, General |
| Paper Information | |
| Registration To | US |
| Conference Code | 2011-07-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Three-dimensional focus scanning by a liquid lens using acoustic radiation force |
| Sub Title (in English) | |
| Keyword(1) | variable-focus lens |
| Keyword(2) | confocal image |
| Keyword(3) | liquid lens |
| Keyword(4) | acoustic radiation force |
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| 1st Author's Name | Daisuke Koyama |
| 1st Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
| 2nd Author's Name | Ryoichi Isago |
| 2nd Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
| 3rd Author's Name | Kentaro Nakamura |
| 3rd Author's Affiliation | Tokyo Institute of Technology (Tokyo Tech) |
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| Speaker | Author-1 |
| Date Time | 2011-07-28 14:10:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2011-28 |
| Volume (vol) | vol.111 |
| Number (no) | no.158 |
| Page | pp.33-38 |
| #Pages | 6 |
| Date of Issue | 2011-07-21 (US) |
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