Dynamic detection of object deformation based onshearing speckle interferometry

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.