光谱学与光谱分析, 2014, 34 (6): 1716, 网络出版: 2014-06-24   

斜入射引入动态多重散射机制的激光散斑抑制

Laser Speckle Suppression Due to Dynamic Multiple Scattering Scheme Introduced by Oblique Incidence
作者单位
1 中北大学仪器科学与动态测试教育部重点实验室, 电子测试技术重点实验室, 山西 太原030051
2 中北大学信息与通信工程学院, 山西 太原030051
摘要
散斑抑制一直是激光显示技术的研究热点。 对激光光束经SiO2溶液所形成散斑的特性分析, 建立了多重散射与散斑颗粒大小的联系。 结合动态光散射理论, 提出利用斜入射引入动态多重散射机制的激光散斑抑制方法, 并构建由静态散射片和装有粒径为300 nm、 摩尔浓度为3.0×10-4 μm-3的SiO2悬浮液的光通管组成的散斑抑制装置, 将其置入激光显示系统的光源部分。 针对光束以不同入射角进入SiO2悬浮液对散斑图像对比度影响进行了系统实验分析。 结果表明, 光束以约8°进入SiO2悬浮液能将散斑图像的对比度从0.43降低至0.067。 通过该方法实现了散斑颗粒的空间平均和散斑图像的时间平均, 提高了散斑抑制的效果。 散斑抑制单元无需振动装置且便于集成到激光投影系统中, 不仅提高了系统的可靠性也减小了成本。
Abstract
Speckle suppression has been the research focus in laser display technology. In the present paper, the relation between multiple scattering and the size of speckle grains is established by analyzing the properties of speckle generated by the laser beam through SiO2 suspension. Combined with dynamic light scattering theory, laser speckle suppression due to dynamic multiple scattering scheme introduced by oblique incidence is proposed. A speckle suppression element consists of a static diffuser and a light pipe containing the water suspension of SiO2 microspheres with a diameter of 300 nm and a molar concentration of 3.0×10-4 μm-3, which is integrated with the laser display system. The laser beam with different incident angles into the SiO2 suspension affecting the contrast of the speckle images is analyzed by the experiments. The results demonstrate that the contrast of the speckle image can be reduced to 0.067 from 0.43 when the beam with the incident angle of approximately 8° illuminates into the SiO2 suspension. The spatial average of speckle granules and the temporal average of speckle images were achieved by the proposed method, which improved the effect of speckle suppression. The proposed element for speckle suppression improved the reliability and reduced the cost of laser projection system, since no mechanical vibration is needed and it is convenient to integrate the element with the existing projection system.

徐美芳, 高文宏, 石云波, 王浩全, 杜彬彬. 斜入射引入动态多重散射机制的激光散斑抑制[J]. 光谱学与光谱分析, 2014, 34(6): 1716. XU Mei-fang, GAO Wen-hong, SHI Yun-bo, WANG Hao-quan, DU Bin-bin. Laser Speckle Suppression Due to Dynamic Multiple Scattering Scheme Introduced by Oblique Incidence[J]. Spectroscopy and Spectral Analysis, 2014, 34(6): 1716.

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