Abstract
Addition fringes are obtained in real time from electronic speckle pattern interferometry (ESPI) using a twin-pulsed laser, when two pulses are fired during a single frame of a CCD camera. This enables object deformations to be studied under very harsh environmental conditions. However, the fringe patterns have poor visibility, because optical noise is reinforced. Automatic phase extraction from addition fringes has not previously been achieved: low-pass filtering to suppress random speckle noise also eliminates the fringes due to their low visibility. A phase-stepping algorithm that calculates phase from ESPI addition fringes without the need for a pre-processing filter is presented in this paper. This has enabled phase to be extracted from ESPI addition fringes for the first time. The algorithm is demonstrated with theoretical and experimental ESPI fringe patterns.
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