论文部分内容阅读
全息三维变形测试在军事、工业测试中有重要意义,而传统的全息术由于记录、显影、定影、再现、复位等条件使其应用受到限制。文中应用CCD实现了数字全息,不仅避免了传统全息显影、定影等过程,也避免了全息材料非线性记录等缺点,并基于双曝光全息干涉术和四步相移法原理,实现了数字相移,取代了传统的应用压电位移器等机械相移法,实现了物体的三维变形测试。由物体变形的二维等高线图和三维立体图,可判读物体变形的大小、变形的方向和变形的形状。大量的实验表明,该方法不仅简化了全息干涉测试的光学装置,而且具有操作简单,测试精度高,其精度容易达到1/10波长。
Holographic three-dimensional deformation testing in the military, industrial testing is important, while the traditional holography due to recording, development, fixing, reproduction, reset and other conditions make its application is limited. In this paper, CCD is used to realize digital holography, which not only avoids the traditional holographic developing and fixing processes, but also avoids the disadvantages of nonlinear recording of holographic materials. Based on double-exposure holographic interferometry and four-step phase shift method, digital phase shift , Instead of the traditional application of piezoelectric displacement and other mechanical phase shift method to achieve the object of the three-dimensional deformation test. From the deformation of the two-dimensional contour map and three-dimensional map, the size of objects can be deformed, the direction of deformation and deformation of the shape. A large number of experiments show that this method not only simplifies the optical device for holographic interference test, but also has the advantages of simple operation and high testing precision, and the accuracy is easy to reach 1/10 wavelength.