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Proceedings Paper

Light-driven actuator using NiTi shape memory alloy
Author(s): Keita Yamaguchi; Ryosuke Ono; Hideki Okamura
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Paper Abstract

The purpose of this paper is to demonstrate a light-driven actuator with high energy conversion efficiency. Ordinarily, light-driven actuators have low conversion efficiency of about 10-5%. This is partly due to an inefficient coupling of the material itself and the actuating mechanism. Our idea is to use a primarily tensioned thin wire as the material since wire can shrink and stretch in a specific direction. Therefore, we created a light-driven actuator with a wire of shape memory alloy. Using Argon-ion laser to irradiate the shape memory alloy, we checked the energy conversion efficiency of this actuator. As a result, we obtained an energy conversion efficiency of about 3.9% that is far greater than the ordinary value for light-driven actuators. If the reflectivity of the shape memory alloy is considered, the conversion efficiency is doubled to 7.8%. When viewed as a heat engine, 7.8% efficiency corresponds to approximately 27% of the theoretical limit from Carnot's theory.

Paper Details

Date Published: 17 November 2008
PDF: 10 pages
Proc. SPIE 7266, Optomechatronic Technologies 2008, 72660B (17 November 2008); doi: 10.1117/12.813635
Show Author Affiliations
Keita Yamaguchi, International Christian Univ. (Japan)
Ryosuke Ono, International Christian Univ. (Japan)
Hideki Okamura, International Christian Univ. (Japan)

Published in SPIE Proceedings Vol. 7266:
Optomechatronic Technologies 2008

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