CCD相对光谱响应同步采样方法研究

连续可调谐均匀单色照明光源系统作为CCD辐射参量定量化专用测试系统,可用于CCD相对光谱响应度的测量。它与传统的测试装置相比,能够实现光谱分辨率1 nm的光谱响应度定标。但是其采用的大功率氙灯超高压供电引入了测试光源不稳定的问题,导致传统分时测量方法引起的测量不确定度较差,不能满足高精度遥感仪器的定标需求,因此提出了同步采样的方法。从理论和器件噪声模型出发,分别对两种方法的测量不确定度进行分析,得出同步采样的方法测得的定标不确定度优于1.03%,与传统分时测量方法相比不确定度提高了43%。分别采用两种方法对目标探测器进行了CCD相对光谱响应对比测试,结果显示,同步采样的方法获得的CCD相对光谱曲线更平坦,与出厂数据相比离散程度更低,进而验证了分析结论的正确性。

Study of synchronous sampling method for the relative spectral response of CCD

Continuously tunable monochromatic light source system is a dedicated test system for radiation parameter quantitatively of CCD, it can be used to measure the relative spectral response of CCD. Compared with the conventional test apparatus, the system is possible to achieve spectral resolution of 1 nm due to the use of the high-power xenon lamp. However, the lamp introduces instability problems. The conventional time-sharing measurement method can lead to poor measurement uncertainty, and can not meet the development needs of high-precision remote sensing instrument, and then a synchronous sampling method was proposed. Combining with the comprehender of the CCD calibration theoretical model, the measurement uncertainty of two methods was analyzed. The result shows that the synchronous sampling uncertainty is better than 1.03%, which increases 43% compared with the traditional time-sharing measurement method. Otherwise, it also has a contrast testing using the two methods. As a result, the relative spectral response curve of the CCD received by the synchronous sampling method is more flat, and the standard deviation is more low, which verify the correctness of the conclusions of the analysis.