CCD相机读出噪声、电荷转移效率的测试和归算的改进方法

简单地介绍了CCD相机的读出噪声、电荷转移效率(CTE)的常用测试和归算方法,指出了其中的不足之处。在此基础上,提出了改进的噪声和CTE的测试和归算方法。也就是,读出噪声的测量以过扫描区的方差为基础来进行。而在CTE的归算时,先采用人-机交互方式确定一条适当的初始转移直线(X射线的单像元事件线)和相应的区间,在此区间中进行的第一次线性拟合得到一条较准确的转移直线,以后根据前一次的结果自动选取区间并进行线性拟合。以此方式就可以归算出较为精确的CTE数据。

Improvement on Test and Reduction Methods for Readout Noise and Charge Transfer Efficiency of CCD Camera

Test and reduction methods in common use for readout noise and charge transfer efficiency (CTE) of CCD camera are introduced briefly, their insufficiencies are pointed out, and then improvements are made. The modified readout noise measurement is based on the standard deviation of a selected square in the overscan image. When the CTE is reduced, an appropriate initial transfer line from the X-ray single-pixel-events plot and its interzone are first determined by the user-PC interaction, and then a linear fit is performed in the interzone so as to get a more precise transfer line. Thus a new interzone is obtained and a next linear fit can be done. In this manner, a more precise CTE datum can be obtained. Another difference, compared with other methods, is that the modified reduction methods are programmed with MATLAB.