摘要
为提高杂光测试系统集成度和测试精度,采用新型光电倍增管模块作为探测器进行杂光系数测试,并研究了测试过程中的数据采集、滤波、计算方法。首先描述了黑斑法测试杂光系数的原理,在此基础上介绍了测试系统工作原理和组成。分析了系统噪声干扰来源,并利用功率谱对噪声信号进行了描述、分析。为降低噪声干扰,对输出信号进行了低通滤波和数据均值处理。对某80~400 mm变焦镜头进行了杂光系数测试实验。当焦距400 mm时,杂光系数均值为2.623%,均方根误差0.019%;焦距80 mm杂光系数均值为1.829%,均方根误差0.02%。实验表明该杂光测试系统具有较高的测量精度和重复精度,满足黑斑法杂光系数重复测量精度要求。
In order to improve the integration of stray light measurement system and the testing accuracy, a new type photomuhiplier tube module is used to test the stray light coefficient. The method of output data acquisition, filtering and calculation of testing system are studied. The principle of black spot method is described, and on this basis, this paper mainly expounds the testing principle and structure of stray light measurement system based on the integrated photomuhiplier tube module. The source of interfering noise is analyzed in the processing of testing the stray light coefficient. The noise signal is represented by the power spectral in this paper. In order to reduce the disturbance of interfering noise, the processing of low-pass filter and the mean value are introduced. The experi- ments are conducted with a zoom lens which the focus bound is 80 - 400 mm. When the focus is 400 mm, the stray light coefficient of lens is 2. 623% , and the standard error is 0. 019%. While the focus is 80 mm, the stray light coefficient of lens is 1. 829% , and the standard error is 0.02%. The experimental results show that the testing accuracy and repeatability accuracy of testing system are outstanding, and which meets the requirement of testing the stray light coefficient with the black spot method.
出处
《电子测量与仪器学报》
CSCD
北大核心
2015年第8期1203-1209,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(611307114)项目
关键词
黑斑法
杂光系数
光电倍增管模块
低通滤波
功率谱估计
black spot method
stray light coefficient
photomultiplier tube module
low-pass filter
power spectrum estimation
