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本文提出以物体表面精细光学结构在白光照射下辐射率随机分布函数作为散斑场,以全息软片为记录介质,采取无镜头成象技术,得到宽频域的散斑底片,并用有一定带宽的准单色光进行全场分析,测量可展曲面变形,其结果不仅具有较高的灵敏度,较大的灵敏度调节范围,而且其中的准备过程、记录过程和分析过程比现有的各种测量曲面变形的散斑法都要简单,该方法将可展曲面变形问题简单地转化为平面问题处理,保留了白光散斑直接记录法在测量平面变形时的全部优点,并能脱离暗室在工程现场中应用。
In this paper, the random distribution function of emissivity under the white light irradiation as the speckle field is proposed based on the fine optical structure of the object surface. The holographic film is taken as the recording medium and the lensless imaging technique is adopted to obtain the speckle film in the wide frequency range. Monochromatic light field analysis, measurable deformation of the exhibition surface, the result not only has high sensitivity, greater sensitivity adjustment range, and the preparation process, the recording process and analysis of the deformation than the existing variety of curved surface Of the speckle method should be simple, the method of deformation of the developable surface simply transformed into a plane problem to deal with, retain the white light speckle direct recording method in the measurement of plane deformation of all the advantages and can be separated from the dark room in the project site application .