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23 August 2017 Design of light guide sleeve on hyperspectral imaging system for skin diagnosis
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A hyperspectral imaging system is proposed for early study of skin diagnosis. A stable and high hyperspectral image quality is important for analysis. Therefore, a light guide sleeve (LGS) was designed for the embedded on a hyperspectral imaging system. It provides a uniform light source on the object plane with the determined distance. Furthermore, it can shield the ambient light from entering the system and increasing noise. For the purpose of producing a uniform light source, the LGS device was designed in the symmetrical double-layered structure. It has light cut structures to adjust distribution of rays between two layers and has the Lambertian surface in the front-end to promote output uniformity. In the simulation of the design, the uniformity of illuminance was about 91.7%. In the measurement of the actual light guide sleeve, the uniformity of illuminance was about 92.5%.
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Yung-Jhe Yan, Chao-Hsin Chang, Ting-Wei Huang, Hou-Chi Chiang, Jeng-Fu Wu , and Mang Ou-Yang "Design of light guide sleeve on hyperspectral imaging system for skin diagnosis", Proc. SPIE 10375, Current Developments in Lens Design and Optical Engineering XVIII, 1037503 (23 August 2017);

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