自适应孔径散焦数字散斑摄影
Adaptive Aperture Defocused Digital Speckle Photography
摘要：
散斑照相术可用于监测固体表面的变形。测量特性，如范围或横向分辨率，在很大程度上取决于光学记录和照明设置。本文展示了如何，通过增加两个适当的穿孔掩模，系统的光学孔径可能会有所不同，从点到点，相应地适应的范围和分辨率，以当地的要求。此外，通过照射狭窄区域，可以独立于光学孔径来选择散斑大小，从而解除对其选择的重要约束。本文在数字散焦散斑照相法的框架内描述了这种新技术。测量范围和空间频率分辨率之间的相互限制关系在局部和整个研究表面时都出现。对它们进行了详细的推导和讨论。
英文摘要：
Speckle photography can be used to monitor deformations of solid surfaces. The measuring characteristics, such as range or lateral resolution depend heavily on the optical recording and illumination set-up. This paper shows how, by the addition of two suitably perforated masks, the optical aperture of the system may vary from point to point, accordingly adapting the range and resolution to local requirements. Furthermore, by illuminating narrow areas, speckle size can be chosen independently from the optical aperture, thus lifting an important constraint on its choice. The new technique in described within the framework of digital defocused speckle photography under normal collimated illumination. Mutually limiting relations between range of measurement and spatial frequency resolution turn up both locally and when the whole surface under study is considered. They are deduced and discussed in detail.
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