CCD电荷转换因子通用测试方法研究

Study of A General Testing Scheme of the CCD’s Charge to Voltage Factor

摘要:

通过分析电荷耦合器件(CCD)图像传感器光电转换、电荷转移、电荷输出的工作原理,提出了一种通用高效的电荷转换因子(CVF)测试方法。该方法采用在CCD感光区域施加直流偏压,水平区施加连续转移的驱动时序的方式,使CCD光敏区以电荷溢出方式往水平区转移电荷,水平区以固定频率不间断转移输出电荷包,从而让CCD输出强度恒定的响应信号；然后通过复位漏电流与输出信号强度的对应关系计算出CCD器件的CVF值。根据该方法的原理设计了一种适应各种CCD器件的通用测试装置,并对多款CCD进行测试验证。结果表明,该方法有效提高了CCD电荷转换因子的测试效率、测试精度和稳定性。

Abstract:

A general efficient charge to voltage factor (CVF) testing scheme is proposed by analysing the working principle of the photovoltaic conversion, charge transfer and charge output in CCD. In the scheme, the photosensitive zone of CCD transfered charge to the horizontal zone and the horizontal zone continuously output charge packets with a constant frequency by adding a DC bias on the photosensitive area of CCD and the continuously transfer driving sequential was added on the horizontal zone. Thus, the stable intensity response signal was output. Then, CVF was calculated by relationship between the reset leakage current and output signal intensity. According to the principle of the method, a general testing device for different CCD devices was designed to adapt to various CCDs, and a variety of CCDs were used for testing and verification. The result shows that the proposed scheme inproves the testing efficiency, accuracy and stability of the CVF.