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提出一种新的测量物体形变的实验方法——旋转孔径散斑照相法。在成象透镜近前方设置一基本孔径,在散斑记录过程中令其连续转动。该法适用于静态和动态问题,静态问题以一维调频孔为基本孔径。对动态问题,介绍了双圆孔、四扇孔和双长扇孔三种基本孔径,能适应多种实验要求。本方法能应用于振动问题,如强迫振动、模态分析等;也能应用于非周期性动态问题,如蠕变、测速度场等。该方法设备简单,散斑条纹清晰可靠,定量分析与其它方法相比吻合很好。
A new experimental method for measuring object deformation is proposed. Rotational aperture speckle photography. A basic aperture is set in front of the imaging lens, causing it to rotate continuously during speckle recording. This method is suitable for both static and dynamic problems. One-dimensional FM holes are the basic aperture for static problems. On the dynamic issues, this paper introduces three basic apertures of double circular hole, four holes and double long fan holes, which can adapt to a variety of experimental requirements. The method can be applied to vibration problems such as forced vibration and modal analysis, as well as non-periodic dynamic problems such as creep and velocity fields. The method has the advantages of simple equipment, clear and reliable speckle pattern, and quantitative analysis in good agreement with other methods.