In-Plane Deformation Measurement by Subtraction Computer-Aided Speckle Interferometry

Contra pose the custom addition mode computer-aided speckle interferometry, which has a poor signal-noise-radio and bad anti-noise capacity, we propose a subtraction computer-aided speckle interferometry. By analyzing the intensity addition, subtraction mode computer-aided speckle interferometry and amplitude addition, subtraction mode computer-aided speckle interferometry, then find that the amplitude subtraction computer-aided speckle interferometry has the best anti-noise capacity, highest signal-noise-radio and highest measured accuracy. So the amplitude subtraction computer-aided speckle interferometry is the best method to measure the deformation of specimen.