Optimising efficiency in diamond turned Fresnel mould masters
Optimising efficiency in diamond turned Fresnel mould masters
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DOI：
10.1117/12.882925
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发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
J. Allsop;A. Mateboer;P. Shore
中科院分区：
文献类型：
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作者：
J. Allsop;A. Mateboer;P. Shore
径向和线形菲涅耳透镜被用作聚光光伏和聚光太阳能热能应用的聚光器。这些衍射透镜的效率直接影响到这类系统的成品率。菲涅尔透镜光学面的波峰和波谷必须锐利，以防止由于舍入造成的扩散和传输损失。对于金刚石车削模具，光学端面尖端的锐度受加工精度、刀具轨迹和刀具磨损/里程的影响。提出了优化光学小平面尖端锐度的策略，从而能够以最小的光学质量劣化来生产大透镜。讨论了直径大于500 mm的径向菲涅耳和长度超过1m的线性菲涅耳的结构保真度和刀具磨损数据。
Radial and Linear Fresnel Lenses are finding application as light concentrators for Concentrated Photovoltaic and Concentrated Solar Thermal power applications. The efficiency of these diffractive lenses directly affects the yield of such systems. Peaks and valleys of the optical facets of the Fresnel lens must be sharp in order to prevent diffusion and transmission loss due to rounding. For diamond turned mould masters, optical facet tip sharpness is affected by machining accuracy, tool-path and tool wear/mileage. Strategies to optimise optical facet tip sharpness are presented which enable production of large lenses with minimal degradation of optical quality. Radial Fresnel produced with diameters over 500mm and Linear Fresnel over 1m long are discussed with data on structure fidelity and tool wear.