用面阵CCD模拟测定星光漂移的方案研究

The study of simulation experiment using plane CCD to measure the micro move of stars

在LAMOST焦面光纤定位系统预研中 ,在焦面板上采用面阵CCD跟踪测量亮星的位置及其漂移 ,以对焦面板进行定位。在实验室条件下 ,用光纤出射光斑代替星光 ,即在光纤一端耦合进光 ,并在另一端用面阵CCD接收光斑 ,以模拟实际中接收星光情况。并利用重心法和图像迭加技术对采集的光斑信号进行处理。结果表明 :用面阵CCD测量星光位置及其漂移具有重复精度高 ,稳定性好的特点 ,且通过图像迭加处理 ,可提高星光信号的信噪比。

In LAMOST system, it is necessary to measure the position and micro move of light stars with plane CCD in its focal plane so that the system can locate the focal plane automatically. The experiment introduced simulated the practical situation with plane CCD to receive stars based on light from lab experiment. That is, using the plane CCD equipped with monitor and graphic card to receive the facula from optic fiber. The article introduced the center of gravity method into the processing of experiment data. A new method used to improve the signal to noise of photoelectric signal is introduced. The results of experiments indicated that the method has the characteristic of high precision and stability.