该文基于棱镜折射理论分析倾斜入射角对菲涅尔透镜焦距变化的影响规律,指明焦距变化的光学原因,提出采用超弹性变形调整焦距的方法,并基于小变形下的线性假设展开理论分析,通过仿真进行验证。结果表明,变形率达到15%时,焦距的伸长率约46.7%,与理论结果相较小于10%,验证了理论模型的正确性。研究结果为超弹性菲涅尔透镜的变形变焦提供了理论依据。
Abstract
The variation of focal length with the oblique incidence angle of light is the main reason for reducing the performance of Fresnel lens solar concentrator. Based on the prism refraction theory, this paper analyzes the influence law of the inclined incidence angle on the focal length change of Fresnel lens by pointing out the optical reason for the focal length change. The method of adjusting the focal length by hyperelastic deformation, and the theoretical analysis based on the linear assumption under small deformation are put forward. The results show that when the deformation rate reaches 15%, the elongation of focal length is about 46.7%, which is less than 10% compared with the theoretical results. The results verify the correctness of the theoretical model, and provide a theoretical basis for the deformation and zoom of hyperelastic Fresnel lens.
关键词
菲涅尔透镜 /
线聚焦 /
倾斜入射 /
变形变焦 /
太阳能聚光
Key words
Fresnel lens /
linear focusing /
oblique incidence /
deformation caused zooming /
solar concentrator
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