期刊
INTERNATIONAL JOURNAL OF OPTOMECHATRONICS
卷 3, 期 4, 页码 277-288出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15599610903391150
关键词
energy conversion efficiency; heat engine; light-driven actuator; photothermal effect; shape memory effect
With the aim of manipulating macroscopic objects, the possibility of improving energy conversion efficiency of light-driven actuators (LDAs) was investigated. Thermal expansion is one of the most efficient mechanisms reported so far but a rough estimation revealed that its upper limit in efficiency is similar to 10(-4)%. Thermodynamics suggests several percent can be achieved in theory, so by using a suitable mechanism there is room for improvement. Based on those considerations we propose a LDA using a pre-tensioned wire of shape memory alloy. This design reduces the energy loss in converting the input light into mechanical motion. We demonstrated that a force larger than 1 Newton and an energy conversion efficiency of 1 percent can be achieved.
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