数字散斑相位图去包裹新算法

Novel Phase Unwrapping Algorithm for Digital Speckle Pattern Interferometry

提出了一种新的数字散斑相位图去包裹算法,主要针对检测对象为复杂非连续物体这一情况。物体在激光照明下,采用光学相位反相相减图像的方法来检测并标识出相位间断区,并利用改进了的行列去包裹算法。使去包裹过程只在相位有效区域进行,从而准确快速地实现全场有效区域的相位去包裹。与已提出的相位去包裹方法相比,该算法具有计算量小,速度快,并能有效地避开大面积的相位间断区的优点,该方法使数字散斑技术可以方便地应用于工程实际中如对复杂非连续构件的变形、振动等方面的定量分析。

Novel phase unwrapping algorithm for digital speckle pattern interferometry （DSPI） is proposed, which is mainly for the complex and discontinuous structure under the illumination of laser, the discontinuous area of phase is detected and identified through the subtraction of two speckle pattern interferograms, with opposite optical phases. Then improved unwrapping process based on the traditional line scan method is conducted in the region where phase is available, and the phase unrapping in the whole available area came out accurately and promptly. This algorithm is more efficient and simpler compared with others reported in the literature, and it can avoid the large phase discontinuous area effectively and conveniently. This novel phase unwrapping algorithm makes quantitative analysis in the actual engineering, such as distortion and vibration using DSPI very convenient.