改善光纤照射装置均匀性的实验研究  

Experimental Research on Improving Uniformity of Fiber-Optical Irradiation Device

作　　者：曾珊珊[1] 刘建[2] 卢利根[1] 张保洲[1,3] 

机构地区：[1]北京师范大学天文系,北京100875 [2]北京师范大学物理系,北京100875 [3]北京师范大学物理系应用光学北京市重点实验室,北京100875

出　　处：《光学学报》2013年第4期195-200,共6页Acta Optica Sinica

基　　金：国家自然科学基金(10973005)资助课题

摘　　要：针对目前利用光纤和复眼透镜获得紫外辐照均匀性较差的现象,提出添加光学积分棒和均匀磨砂石英片改善光纤照射装置均匀性的方法,实测表明改善效果十分显著。选取紫外辐照中的紫外线A(UVA)波段作为测量对象,光纤入射端添加光学积分棒后,80mm×80mm辐照面均匀性由原来的±8.9%提高到±3.5%,中心30mm×30mm区域内均匀性由±3.3%提高到±0.7%。在此基础上,再在复眼透镜入射端添加磨砂石英片后,中心30mm×30mm区域内均匀性可达±0.6%,且原先偏心分布的紫外辐照呈现出中心轴对称分布。另外还提出了提高紫外辐照度的同时改善辐照均匀性的多光源叠加法,结果表明,利用两个光纤照射装置叠加辐照,80mm×80mm的辐照面上辐照度及均匀性分别约为30mW/cm2和±3.9%;利用三光源叠加经复眼透镜投射,直径为80mm的辐照面内辐照度和均匀性分别约为60mW/cm2和±2.4%。Considering that the irradiance distribution obtained by using optical fiber and fly-eye lens is of poor uniformity, methods of adding integrator rods and frosted glasses to improve the uniformity of optical fiber irradiation device are proposed. The measurement results indicate that the effect is very remarkable. The ultraviolet A （UVA） band of ultraviolet radiation is measured. The uniformity is raised from ± 8.9 % to ± 3.5 % in the irradiated area of 80 mm× 80 mm after an integrator rod is added at the input end of the optical fiber. And the uniformity of the central area of 30 mm× 30 mm is raised from ± 3.3 % to ± 0.7 %. On that basis, after the frosted glass is added at the input end of the fly-eye lens, its uniformity can reach 4-0. 6% in the central area of 30 mm × 30 mm, and the UV irradiance which is eccentrically distributed becomes axially symmetrically distributed. The multiple light sources superposing methods are also put forward to improve uniformity of light source while higher irradiance is obtained at the same time. The results indicate that the irradiance and the uniformity can reach about 30 mW/cm^2 and ± 3.9 % respectively in the irradiated area of 80 mm × 80 mm by using two optical fiber irradiation devices to superpose irradiation. Using the methods of superposition of three light sources and casted by the fly-eye lens, the irradiance and the uniformity are about 60 mW/cm^2 and ± 2.4 % respectively in the irradiated area whose diameter is 80 mm.

关 键 词：光纤光学 强紫外光源 光纤照射装置 均匀性 辐照度 

分 类 号：O432.2[机械工程—光学工程]