基于剪切散斑干涉技术的物体变形动态检测

摘要

为使仅适用于静态测量的空间相移剪切散斑干涉系统可用于物体变形的动态测量,在对传统剪切散斑干涉系统加以改进的基础上,提出一种物体变形动态检测方法.将检测系统中的压电陶瓷控制器用参考镜代替,减少了物理装置控制与执行的时间.对于物体发生变形的同一状态,仅需采集一幅干涉图像即可满足后期计算,加以二维连续小波滤波和最小二乘相位解包算法,能满足物体变形动态在线检测的需求.理论和实测实验表明,该方法能快速可靠地检测出物体动态形变,整个系统的最大误差范围在-1.5 rad～1.5 rad之间,整个检测过程最大误差百分比为6.4％,有较高的精度和实用性,为新型剪切散斑干涉测量系统的改进和设计提供参考.%In order to make the spatial phase-shift shearing speckle-pattern interferometry system for static measurement only be used for dynamic measurement of object deformation,a new dynamic detection method based on improved traditional shear speckle interferometry is proposed.The piezoelectric ceramic transducer (PZT) in testing system is replaced with reference mirror to reduce the control and execute time.For the same state of the distortion of object,only one interferogram needs to be collected to meet later calculation.With two-dimensional continuous wavelet filtering and least-squares phase unpack algorithm,this system can meet the needs of dynamic on-line detection of object deformation.Theoretical and experimental results show that the proposed method can detect the dynamic deformation of the object quickly and reliably,and has high precision and practicability.The maximum error of whole system is in the range of-1.5 rad～1.5 rad and the maximum percentage error of whole detection process is 6.4％.It can provide a reference method for the improvement and design of the new shear speckle interferometry measurement system.