摘要
对电子倍增CCD的噪声特性进行了研究,并在此基础上选择最佳工作模式。介绍了反转和非反转模式的工作原理,分析了不同工作模式下暗电流与时钟感生电荷的表现并进行了对比。以工作温度、积分时间和垂直转移次数为参量,建立了最佳工作模式的数学模型,求解出最佳工作模式的积分临界点,确定了电子倍增CCD的最佳工作模式。最后,结合具体器件的参数模拟了最佳工作模式下电子倍增CCD的噪声特性曲线。仿真结果表明:室温下(293 K)的积分临界点为1.6μs。当积分时间>1.6μs时,最佳工作模式为反转模式;当积分时间<1.6μs时,最佳工作模式为非反转模式。研究结果为电子倍增CCD工作模式的选取提供了切实可靠的理论依据。
In order to obtain the best work state and optimum imaging quality for an electron multiplying CCD, the noise characteristics of electron multiplying CCDs are studied and used to select the optimum operation mode. The operation principles of inverted mode and non-inverted mode are introduced. The performance of dark current and clock induced charge is analyzed and compared with different operation modes. A mathematical model of optimum operation mode is established by taking operation temperature, integration time and total number of parallel transfers as parameters. Then, integration critical point is calculated to determine the optimum operation mode. Finally, the curve of noise performance in optimum operation mode is simulated according to the parameters of practical devices. The simulation results indicate that the integration critical point is 1.6μs at room temperature （293 K）. When integration time is longer than 1.6μs, the inverted mode is optimum operation mode, and when integration time is less than 1.6μs, the non-inverted mode is preferable. The results offer a reliable theoretical basis for the operation mode selection of electron multiplying CCDs and provide a vital instructional significance for the application and design of electron multiplying CCDs.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2008年第10期1977-1981,共5页
Optics and Precision Engineering
基金
国防科工委国防基础科研基金资助项目(No.A2620060242)
中国兵器工业集团公司装备预研基金资助项目(No.4040508011)
关键词
微光成像
最佳工作模式
噪声分析
电子倍增CCD
low light level imaging
optimum operation mode
noise analysis
electron multiplyingCCD
