【摘要】 数字全息是用数字的方式记录和处理全息图像,通常在使用双曝光法测量物体微小形变时,对于形变量接近入射波长一半的情况一般使用相移的方法,这种方法需要拍摄多幅全息图。为了简化过程,提出将灰度值和双曝光方法相结合测量物体的微小形变。该方法通过画出条纹图的灰度曲线,判断条纹级数,计算出物体形变量;只需拍摄两幅全息图。通过理论分析和实验验证,取得了满意的结果。结果表明,该方法在一定的范围内是可行的。更多还原

【Abstract】 The usual method for recording and processing hologram images is digital holography,which is also suitable for double-exposure to measuring object deformation.However,the deformation near half of the optical wavelength is based on phaseshift method,and it needs more than three hologram images.In order to simplify the method,the double-exposure with gray-level was extended to measure deformation.By using the gray-level,with the image of gray-level distributions,the fringe numbers can be calculated and then the out-of-plane displacement was obtained.This method only needs take two images.Through theoretical analysis and experimentation,the result is satisfactory,which show this method works well in a certain extent.更多还原