Abstract
A method for simultaneously measuring whole field in‐plane displacements by using optical fiber and based on the dual‐beam illumination principle electronic speckle pattern interferometry (ESPI) is presented in this paper. A set of single mode optical fibers and beamsplitter are employed to split the laser beam into four beams of equal intensity.One pair of fibers is utilized to illuminate the sample in the horizontal plane so it is sensitive only to horizontal in‐plane displacement. Another pair of optical fibers is set to be sensitive only to vertical in‐plane displacement. Each pair of optical fibers differs in longitude to avoid unwanted interference. By means of a Fourier‐transform method of fringe‐pattern analysis (Takeda method), we can obtain the quantitative data of whole field displacements. We found the uncertainty associated with the phases by mean of Monte Carlo‐based technique.
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