Eye safety for scanning laser projection systems
Eye safety for scanning laser projection systems
复制标题
扫描激光投影系统的眼睛安全
DOI：
10.1515/bmt-2011-0088
复制
发表时间：
2012
影响因子：
1.8
通讯作者：
N. Heussner
中科院分区：
文献类型：
--
作者：
A. Frederiksen;Reinhold Fiess;W. Stork;S. Bogatscher;N. Heussner
摘要在微型投影机的不断发展的领域，基于激光的扫描系统可能比基于DLP或LCoS的成像器更有优势，因为它们具有小型化、提高光学效率和降低成本的潜力。然而，组合激光束的高能量密度可能对人眼有害。因此，激光投影系统必须根据其最大光输出功率确定激光类别。该功率限制了所显示的图像的亮度，这对于移动的应用是特别感兴趣的。根据激光器的波长和输出功率对激光器进行分类的各种方法在激光器安全标准中有描述。人们发现，实际的安全规定不能直接应用于扫描系统。在二维扩展光源方面的光学条件的详细分析适合于考虑激光扫描仪设备。在本文中，讨论了将激光标准应用于扫描系统的替代方法。最大光通量的扫描系统参数的依赖关系进行了审查。结果表明，视网膜光暴露在现有的激光法规的评估导致高估的危险潜力。先进的调查建议，以支持激光扫描投影机的分类合适的标准的定义。
Abstract In the growing field of pico-projectors, laser-based scanning systems may be advantageous over DLP- or LCoS-based imagers due to their potential for miniaturization, enhanced optical efficiency and cost reduction. The high energy density of a combined laser beam can, however, be hazardous to the human eye. Laser projection systems must therefore be identified with the laser class, depending on their maximum optical output power. This power limits the brightness of the displayed image, which is of particular interest for mobile applications. Various approaches to classifying laser devices by their wavelength and output power are described within the standards for laser safety. It is found that actual safety regulations cannot be directly applied to scanning systems. A detailed analysis of the optical conditions in terms of a two-dimensional extended light source is appropriate for the consideration of laser scanner devices. In this article, alternative ways of applying laser standards for scanning systems are discussed. The dependencies of maximum luminous flux from scanning system parameters are reviewed. It is shown that the evaluation of retinal light exposure in terms of existing laser regulations leads to an overestimation of the hazardous potential. Advanced investigations are proposed to support the definition of suitable criteria for the classification of laser scanning projectors.