Patent ID: 6943870
Filing Date: 2005-09-13
Classification: G01B

Abstract:
1. A deformation measuring method using electronic speckle pattern interferometry, said method comprising the steps of determining a phase change curve of a dynamic object to be observed phase-wrapped in a predetermined phase range by analysis according to a speckle pattern image carrying phase information of said object obtained by using electronic speckle pattern interferometry; and then phase-unwrapping said phase change curve; wherein, according to a plurality of speckle pattern images each obtained at a predetermined time, an intensity signal in a temporal domain of each image point is determined, a cosine component of said intensity signal is extracted, thus extracted cosine component is subjected to Hilbert transform in said temporal domain so as to determine a sine component of said intensity signal; and determine a phase change for each image point according to a ratio between thus determined sine and cosine components so as to determine a phase change curve of said object.