液晶与显示2017，Vol.32Issue(2)：124-131,8.DOI:10.3788/YJYXS20173202.0124
哈特曼波前探测器电子倍增增益的自适应控制方法
Adaptive control of EMCCD gain in Hartmann wavefront sensor
摘要
Abstract
Electron multiplying charge-coupled-device (EMCCD) in Hartmann wavefront sensor (WFS) makes the SNR higher than the ordinary CCD.However,a fixed EM gain may not work when the brightness of the observed target changes in large ranges within a few minutes.Thus,an adaptive control method of the Hartmann WFS' gain is proposed.The control value is the average of the maximum signals of all the light spots in a frame.The goal value for control is predetermined based on the linear relation of the signal with the EM gain and the number of photons collected in sub-apertures.The self-protection for brightness super saturation of the EMCCD has to be considered for the goal value.Simulations and experiments indicate that the proposed control method keeps the sensing in a high SNR without the self-protection of the EMCCD occurred even when the target brightness changes in sine curves.关键词
自适应控制/电子倍增增益/哈特曼波前探测器/电子倍增CCDKey words
adaptive control/EM gain/Hartmann wavefront sensor/electron multiplying CCD分类
数理科学引用本文复制引用
李大禹,朱召义,王少鑫,宣丽..哈特曼波前探测器电子倍增增益的自适应控制方法[J].液晶与显示,2017,32(2):124-131,8.基金项目
国家自然科学基金(No.61405194) Supported by National Natural Science Foundation of China(No.61405194) （No.61405194）
