TDI-CCD总剂量辐射效应及测试

为评估空间辐射效应对应用于某空间相机的TDI-CCD的成像性能的影响,从器件的电路结构入手,分析了总剂量辐射效应对器件主要性能指标的影响.针对此器件的总剂量辐照测试方法研制了测试装置.用~(60)Co 对器件进行了γ射线总剂量辐照实验,定量测试了受辐照前后器件的光电响应性能及对比度传递函数的变化情况.实验结果表明,总辐照剂量达到20 krad(Si)时,定制TDI-CCD的相对响应度、暗电流、动态范围、最大信噪比相对于该器件没受辐照的初始值变化量均小于5%,对比度传递函数(CTF)没有明显变化,说明定制TDI-CCD器件能够满足某空间相机的使用要求.

Influence of total dose effects on TDI-CCD and corresponding test methods

In order to evaluate the effect of space radiation on the imaging function of a TDI-CCD, the influence of the Total Dose Effects (TDEs) on the main specifications of the TDI-CCD was analyzed based on the circuit structure of the device. The test equipment and the test methods for the TDI-CCD were developed based on the TDEs.A total dose ~(60)Co γ irradiation experiment on the device was studied to measure quantitatively the change of the photoelectric response capacity and the CTF of the device before and after irradiation. Experimental results demonstrate that when the total dose irradiation reach 20 krad(Si),the changing ranges of the relative responsibility, dark signals, dynamic ranges and the SNR of the specified TDI-CCD are less than 5%, and the contrast transfer function (CTF) has almost no change as compared to the initial values. The conclusion is that the specified TDI-CCD can meet the requirement of the space cameras.