摘要
讨论了电子倍增CCD的噪音组成及各自的产生机理,在此基础上建立了电子倍增CCD的总噪音理论模型.按照信号倍增过程的随机性,推导了电子倍增CCD的过剩噪音因子并求出了增益趋向无穷大时的极限值.对电子倍增CCD相机进行了噪音测试,采集了不同增益下噪音的输出波形和频谱图.根据增益和噪音电压的函数曲线,结合理论模型对不同增益下的噪音组成进行了定性分析.结果表明:低增益时,电子倍增CCD主要受限于读出噪音,高增益时则为暗电流噪音和时钟感生电荷.
Based on the discussion about noise components and their generating mechanisms of electron multiplying CCDs, total noise theoretical model is established. According to the random of signal multiplication,excess noise factor of the electron multiplying CCD is derived and the limiting value is calculated when gain approaches infinity. Noise measurement of the electron multiplying CCD is carried out at last. Acquisition of output noise waveform and spectrum is done at different gain. The relationship between noise voltage and gain is analyzed and qualitative analysis of noise components at different gain is described. The experimental results show that the electron multiplying CCD is limited to readout noise at low gain while dark current and clock induced charge are dominated at high gain.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2009年第4期756-760,共5页
Acta Photonica Sinica
基金
国防基础科研基金
装备预研基金资助
关键词
微光成像
电子倍增CCD
噪音特性
过剩噪音因子
Low-light-level imaging
Electron multiplying CCD
Noise characteristics
Excess noise factor
