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针对紫外-可见光谱水质检测系统单个LED光源输出功率低、光束质量差的问题,提出了一种多束紫外LED光源与光纤合束耦合的结构设计方案。运用ZEMAX光学分析软件开展了仿真设计研究,针对紫外LED光源与光纤耦合发散角较大的问题,设计了非球面准直透镜,准直后发散角为0.403mrad;针对光束尺寸与光纤的匹配问题,进行了消色差双分离聚焦耦合透镜的设计。实验结果表明,合束LED光束汇聚的弥散斑的RMS尺寸为186.412μm,GEO点尺寸为290.071μm,光束中95%以上的能量集中在300μm以内,实现了多束LED光源与光纤的高效耦合。
Aiming at the problem of low output power and poor beam quality of single LED light source in UV-Vis spectrum water quality detection system, a multi-beam UV LED light source and fiber bundle coupling structure design was proposed. ZEMAX optical analysis software was used to carry out the simulation design and research. Aiming at the large coupling angle between ultraviolet LED light source and optical fiber, an aspheric collimating lens was designed and the collimation divergence angle was 0.403 mrad. For the matching between the beam size and optical fiber , The design of achromatic double coupling focusing lens was carried out. Experimental results show that the RMS size of confluent speckles converging with LED beam is 186.412μm and the GEO spot size is 290.071μm. More than 95% of the energy in the beam is concentrated within 300μm, which achieves the efficient coupling between multi-beam LED light source and optical fiber.