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针对传统聚光系统中菲涅耳透镜成本较高并且光强分布不均匀的弊端,提出了利用紫外纳米压印技术制作菲涅耳透镜的方法.利用几何光学的光线追迹理论,设计了菲涅耳透镜模具.采用自行研制的紫外纳米压印系统对模具进行压印,紫外曝光后制得薄膜菲涅耳透镜.在太阳光下进行了测试,测试结果表明,低成本、高聚光倍数和光强分布均匀的菲涅耳透镜是可以实现的. 相似文献
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Solar concentrators with two reflection mirrors are numerically designed by using a ray-tracing method to obtain higher concentration ratio when the concentrator tracing error is existed. The primary reflection mirror adopts paraboloidal mirror; the secondary mirror adopts hyperboloidal or ellipsoidal mirror. The optimal designed shape parameters for hyperboloidal and ellipsoidal cases are obtained, respectively. It is found that, when the concentrator tracing errors are 0°, 0.5° and 1°, the concentration ratios for hyperboloidal case are about 5837, 1954 and 1127 at f-number1=0.22 and NA2=0.62 and the one for ellipsoidal case are about 5860, 1993 and 1193 at f-number1=0.25 and NA2=0.62, respectively. Obviously, the concentrator with the ellipsoidal mirror is slightly better than the one with the hyperboloidal mirror. 相似文献
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We survey the main results in the authors PhD Thesis presented in December 2002 at the Université Libre de Bruxelles and supervised by Prof. Martine Labbé. The dissertation is written in English and is available at smg.ulb.ac.be. Several versions of concentrator location problems in telecommunication networks are studied. The thesis presents a list of polyhedral results for these problems and a branch and cut algorithm for the most general problem introduced.Received: October 2003, AMS classification:
90B80, 90B18, 90C57 相似文献