LED照明的光栅光调制器光学特性分析与实验

史玲娜; 黄尚廉; 孙吉勇; 张洁; 张智海

光学学报, 2008, 28 (11): 2225, 网络出版: 2008-11-17

LED照明的光栅光调制器光学特性分析与实验

Optical Performance Analysis and Experiment of Grating Light Modulator with LED Light Source

论文大纲

史玲娜 ^1,2,3,*黄尚廉 ^1,2孙吉勇 ^1,2张洁 ^1,2张智海 ^1,2

作者单位

¹ 教育部光电技术与系统重点实验室, 重庆 400030

² 重庆大学光电工程学院, 重庆 400030

³ 重庆交通大学理学院物理教研室, 重庆 400074

摘要

针对一种新型的光调制器——光栅光调制器, 研究用LED作为其照明光源时对光学调制特性的影响。以部分相干光理论为依据, 结合MATLAB仿真, 推导出用LED照明光栅光调制器时, 光源带宽对成像对比度具有较大的影响, 通过滤色片将光源带宽减小到13 nm时, 像面上的对比度约为150, 进一步减小带宽至10 nm, 对比度将达到225。光源的尺寸在与光源到光栅光调制器之间的距离相比小于0.03时, 对光栅光调制器的光学信息处理不会有影响, 并通过实验加以证实, 从而说明采用LED作为光栅光调制器照明光源的可行性。

Abstract

The effect of LED light source on modulation performance of grating light modulator (GLM) is discussed. Based on partially coherent light theory, simulation by MATLAB software shows LED light sources bandwidth will affect the image contrast greatly. If the bandwidth is reduced by filter to 13 nm, the image contrast will be 150, and if the bandwidth decreases to 10 nm, the contrast will be 225. Furthermore, if the ratio of the size of light source and the distance between GLM and light source is less than 0.03, the size of light source will not influence the optical information processing. The research results are testified by experiments. These results prove the feasibility of LED as the light source to GLM.

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史玲娜, 黄尚廉, 孙吉勇, 张洁, 张智海. LED照明的光栅光调制器光学特性分析与实验[J]. 光学学报, 2008, 28(11): 2225. Shi Lingna, Huang Shanglian, Sun Jiyong, Zhang Jie, Zhang Zhihai. Optical Performance Analysis and Experiment of Grating Light Modulator with LED Light Source[J]. Acta Optica Sinica, 2008, 28(11): 2225.

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