光学学报, 1987, 7 (12): 1069, 网络出版: 2011-09-20
研测动态问题的旋转孔径散斑照相法Ⅰ:双孔、四扇孔
Rotating aperture method of speckle photography for dynamic problems I: Two-aperture and four-fan-aperture
散斑照相 旋转孔径 位移场 动态问题 同步 衍射晕 Speckle photography Rotating aperture Displacement-field Dynamic problem Synchronization Diffraction halo
摘要
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。
Abstract
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 olear and reliable. Quantitative analysis of experiments agree well with the results obtained from other methods.
顾杰, 沈永昭, 蔡铭之. 研测动态问题的旋转孔径散斑照相法Ⅰ:双孔、四扇孔[J]. 光学学报, 1987, 7(12): 1069. GU JIE, SHEN YONGZHAO, CAI MINGZHI. Rotating aperture method of speckle photography for dynamic problems I: Two-aperture and four-fan-aperture[J]. Acta Optica Sinica, 1987, 7(12): 1069.