Investigation of light output uniformity and performance using a UV transmitting glass optic for a multi-UV LED array

SPIE OPTO Pub Date : 2016-03-16 DOI:10.1117/12.2209714
Brian Jasenak, Rachel Willsey, A. Willsey, Jamie Forish
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Abstract

Ultraviolet light-emitting diode (UV LED) adoption is accelerating; they are being used in new applications such as UV curing, germicidal irradiation, nondestructive testing, and forensic analysis. In many of these applications, it is critically important to produce a uniform light distribution and consistent surface irradiance. Flat panes of fused quartz, silica, or glass are commonly used to cover and protect multi-UV LED arrays. However, they don’t offer the advantages of an optical lens design. An investigation was conducted to determine the effect of a secondary glass optic on the uniformity of the light distribution and irradiance. Glass optics capable of transmitting UV-A, UV-B, and UV-C wavelengths can improve light distribution and intensity. In this study, a UV transmitting glass formulation and secondary linear optic were designed and manufactured to demonstrate their effects on achievable irradiance intensity and uniformity. Prismatic patterning on the light source surface of the lens was used to minimize reflection losses on the incident surface of the glass. Fresnel optics were molded into the opposite side of the UV transmitting glass to control the refraction of the light and to gain the desired light intensity distribution from two multi-UV LED arrays. A 20% increase in relative irradiance was observed while maintaining the same coverage area. This work discusses the optical design and the resulting benefits of controlled light output on UV LED systems, which include reduced driving current, decreased thermal deterioration, improved energy efficiency, and longer LED lifetime.
多紫外LED阵列用紫外透射玻璃光输出均匀性及性能研究
紫外发光二极管(UV LED)的采用正在加速;它们被用于新的应用,如紫外线固化、杀菌照射、无损检测和法医分析。在许多这些应用中,产生均匀的光分布和一致的表面辐照度是至关重要的。熔融石英,二氧化硅或玻璃的平板通常用于覆盖和保护多紫外LED阵列。然而,它们没有光学透镜设计的优势。研究了二次光学玻璃对光分布均匀性和辐照度的影响。能够传输UV-A、UV-B和UV-C波长的玻璃光学元件可以改善光的分布和强度。在这项研究中,设计和制造了一种紫外线透射玻璃配方和二次线性光学元件,以证明它们对可实现的辐照强度和均匀性的影响。透镜光源表面的棱镜图案被用来最小化玻璃入射表面的反射损失。菲涅尔光学元件被模压到紫外线透射玻璃的另一侧,以控制光的折射,并从两个多紫外LED阵列中获得所需的光强分布。在保持相同覆盖面积的情况下,观察到相对辐照度增加了20%。这项工作讨论了光学设计和控制UV LED系统的光输出的好处,包括减少驱动电流,减少热劣化,提高能源效率和更长的LED寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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