2 November 2011 Comparison of background-oriented Schlieren and fringe deflection in temperature measurement
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We report the results of a comparison analysis of the accuracy of two optical techniques which are based on ray deflection, background-oriented schlieren (BOS) and fringe deflection (FD). In both techniques, a camera registers images of a spatial pattern displayed on a screen: for BOS, spots randomly located; for FD, straight fringes. Two images corresponding to two different states of a phase object are then compared: with and without the object. After introducing the object, the corresponding spatial structures undergo displacements that are proportional to the change of index of refraction. The displacements are calculated by digital correlation in BOS, and by phase retrieval in FD. Therefore, by both techniques, displacement maps of numerically-simulated phase objects are obtained. Preliminary results show for FD, higher accuracy and less numerical processing.
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A. Blanco Miranda, B. Barrientos García, C. Mares Castro, "Comparison of background-oriented Schlieren and fringe deflection in temperature measurement", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 801180 (2 November 2011); doi: 10.1117/12.903403; https://doi.org/10.1117/12.903403

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