宽动态范围微光照度源的设计与性能测试  

Design and Performance Test of Low Light Level Illumination Source with Wide Dynamic Range

作　　者：李越 袁银麟 叶英杰 孔德垚 肖岚 翟文超 郑小兵 LI Yue;YUAN Yinin;YE Yingjie;KONG Deyao;XIAO Lan;ZHAI Wenchao;ZHENG Xiaobing(School of Environment Science and Optoelectronic,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,合肥230026

出　　处：《光子学报》2023年第8期172-182,共11页Acta Photonica Sinica

基　　金：中国科学院重点实验室基金(No.CXJJ-22S002)。

摘　　要：为满足微光像增强器等微光传感器的高精度辐射定标需求,设计了宽动态范围微光照度源。该微光照度源由子积分球、母积分球、可调光阑和圆筒光阑组成。调节可调光阑面积,改变子积分球导入母积分球的辐射通量,实现了光源照度6个量级的调节功能,且保证了光源色温不变。圆筒光阑是具有双微孔光阑和消杂光挡板的筒状结构,可以将积分球亮度光源转化为均匀的照度光源。母积分球上设置了集成了半导体制冷片的硅光电二极管监视探测器,可实现光源照度的监测与设置。开展了宽动态范围微光照度源性能测试,测试结果表明:微光照度源的照度覆盖3.8×10^(-6) lx~12 lx,非稳定度小于0.001 8%。High-precision radiometric performance test and calibration of field detectors are one of the important steps in the development of low-light level instruments and sensors.With the rapid development of low-light night vision instrument,photon microscope,low-light fluorescence imaging,biomedical imaging,and deep space exploration,higher requirements are put forward for the calibration light source of low-light level devices.Image intensifier is the core component of low-light night vision system,and its illuminance response range should be as low as 10~(-4) lx.The signal-to-noise ratio and optical gain of image intensifier play a decisive role in the imaging quality of the whole low-light detection system.To meet the high precision calibration requirements of low-light level sensors such as low-light image intensifier,a wide dynamic range low level illumination source with small volume and low power consumption is designed.Aiming at the requirements of the field radiometric response characteristics test of low-light level detectors,the design scheme,structure,and working principle of the wide dynamic range low-light level illumination source are first introduced.The wide dynamic range illumination source is composed of an adjustable dynamic range integrating sphere light source unit,a cylinder aperture and a feedback and control unit.The integrating sphere light source adopts the structure of child integrating sphere and parent integrating sphere.A halogen lamp source is built into the child integrating sphere,and the light is reflected several times inside the integrating sphere to achieve uniform brightness at the outlet.An adjustable aperture between the parent and child integrating spheres is used to realize the function of wide dynamic range flux adjustment.The area of the adjustable aperture determines the flux of light from the child integrating sphere into the parent integrating sphere.Compared with the way in which the flux of halogen light is regulated by the current of the source,it ensures that the col

关 键 词：微光 光源 积分球 照度 亮度 定标 光电探测器 

分 类 号：O432.1[机械工程—光学工程] TH741[理学—光学]