研测动态问题的旋转孔径散斑照相法Ⅰ:双孔、四扇孔

本文提出一种研测动态问题的实验新方法——旋转孔径散斑照相法。该法设备简单,利用一个旋转孔径装置,能在一张散斑图上记录下物体动态变形的全过程,然后在全场波滤分析时把各瞬时的信息分离出来,可得任意时刻的瞬态位移场。转孔法能应用于振动和非周期性动态问题,并以三个实验证实其可行性。实验结果表明,散斑条纹清晰可靠,定量分析与其它方法所得结果一致。

Rotating aperture method of speckle photography for dynamic problems I: Two-aperture and four-fan-aperture

In this paper, a new experimental technique-rotating aperture method of speckle photography for dynamic problem is proposed. The displacement field of any moment of a specimen can be obtained, while simple equipment is needed. Using a rotation device, the whole dynamic process can be recorded on a single specklegram, and then information of every moment can be separated from each other easily by whole-field filtering. This method is applicable not only to vibration problems, but also to non-periodic dynamic problems. Three experiments have been carried out for demonstration. Speckle fringes are clear and reliable. Quantitative analysis of experiments agree well with the results obtained from other methods.