基于可见光系统的杂散光评价方法研究

Research on stray light evaluation methodbased on visible light system

随着光电成像技术日新月异的发展,杂散光干扰现象成为光电系统难以回避的问题。为了更好地表征可见光光学系统杂散光程度,解决现有评价方法——PST算法,无法表征杂散光入射在像面的总能量和能量分布的问题,本文提出一种优化后的等效PSTη计算方法。以一种可见光光学系统为例,通过杂散光仿真软件得到太阳光相对系统光轴各离轴角度的杂散光数据,分别使用原有PST算法和PSTη算法与杂散光辐照度分析图进行对比,结果表明PSTη算法在传统PST计算值一致时,能够更为准确表达杂散光变化趋势,由此可以更好的表征可见光光学系统杂散光分布情况。以PSTη作为评价指标设计了可见光光学系统杂散光抑制措施,验证了PSTη具备指导实际杂散光分析抑制工作的能力。该评价指标也可以推广到其他波段的成像系统中。

With the rapid development of optoelectronic imaging technology,stray light interference phenomenon has become a difficult problem for optoelectronic systems to avoid.In order to better characterize the stray light degree of visible optical system and to solve the problem that the existing evaluation method,PST algorithm,cannot characterize the total energy and energy distribution of stray light incident on the image plane,an optimized equivalent PSTηcalculation method is proposed in this paper.Taking a visible optical system as an example,the stray light data of each off axis angle of sunlight relative to the optical axis of the system are obtained by stray light simulation software,and the original PST algorithm and the PSTηalgorithm are compared with the stray light irradiance analysis diagram,respectively.The results show that the PSTηalgorithm can more accurately represent the stray light change trend when the traditional PST calculation values are consistent,and thus can better characterize the stray light distribution of visible light systems.The PSTηis used as an evaluation index to design stray light suppression measures for visible optical systems,and the ability of PSTηto guide the actual stray light analysis and suppression work is verified.The evaluation index can also be extended to other wavelength imaging systems.