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- W2019369566 abstract "The application of optical metrology using Electronics Speckle Pattern Shearing Interferometry (ESPSI) in industry, is becoming more prevalent as a method of quality assurance and non-destructive testing (NDT). ESPSI provides non-contact full-field inspection of the test object generating displacement derivative data. The trend of using ESPSI in quality assurance in NDT involves the desire for quantitative measurement. ESPSI may be used for out-of-plane displacement derivative (slope) measurements ((delta) w/(delta) x) or potentially in-plane slope measurements (such as (delta) u/(delta) x), depending on optical configurations and object boundary conditions. Current concern is focussed on accuracy of commercial ESPSI systems and questioning the extent of error compensation in the associated fringe software systems. This paper presents studies which have been analyzing in-plane derivative measurement accuracy, as a function of object illumination wave-front divergence. Theoretical error analysis supported by experimental analysis has been performed using restrained aluminum alloy cantilever beam. The relative error is measured by comparing displacement derivative data of measurements using divergent illumination with respect to collimated illumination. The measurement error has been found to be dependent on the direction of illumination and the shearing amount at a fixed distance, with certain combinations producing values exceeding 30%." @default.
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- W2019369566 date "2000-08-31" @default.
- W2019369566 modified "2023-09-26" @default.
- W2019369566 title "<title>In-plane error analysis in ESPSI: the effect of beam divergence</title>" @default.
- W2019369566 doi "https://doi.org/10.1117/12.397942" @default.
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