基于衍射光栅的CCD相机标定方法

摘要

提出一种基于1维线衍射光栅的CCD相机光电响应特性标定方法,该方法利用衍射光栅对入射光束的分束特性,在远场焦平面内形成一系列衍射子光斑,采取有效的方法对多组衍射子光斑峰值测量数据进行融合,得到测量灰度值及通过理论计算得到的理论灰度值,拟合两组数据从而完成对CCD光电响应特性的标定.根据实验室现有的激光源与聚焦光学系统的参数,设计了一系列l维线光栅,完成某特性未知的红外CCD相机对中红外激光光电响应特性的标定.该标定方法具有光能利用率高的特点,多组测量数据的融合扩大了CCD标定的范围,并对标定结果在光斑真实形态重构中的应用进行了分析讨论.%A method of calibrating CCD camera based on 1-D linear diffraction gratings is presented. With the beam splitting character of the diffraction grating, a series of diffraction sub-spots are formed in the focal plane, different sets of measurement data of the sub-spot peak intensity are syncretized and the calibration of infrared CCD camera' s opto-electronic characteristic is completed by fitting the measurement data and the theoretical data. According to the parameters of the laser source and the focal optical system available in the laboratory, a series of 1-D linear diffraction gratings are designed and an infrared CCD camera with an unknown character is calibrated. The presented method has higher light available ratio, and the syncretization of multiple sets of measurement data expands the calibrating range of CCD camera. The application of calibrating results in original spot recon-struction is also discussed.