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Moire deflectometry
Moiré Deflectometry is an interferometry technique,〔O. Kafri Optics letters 5,555 (1980)〕 in which the object to be tested (either phase object or specular surface) is mounted in the course of a collimated beam followed by a pair of transmission gratings placed at a distance from each other. The resulting fringe pattern, i.e., the moiré deflectogram, is a map of ray deflections corresponding to the optical properties of the inspected object.
Moiré Deflectometry can be a powerful tool for nondestructive optical testing. A major advantage of the technique is that it is less sensitive to mechanical vibration, and it is therefore widely used in the ophthalmic industry for laminar analysis and wind tunnel measurements as a quantitative replacement to Schlieren photography and Shadowgraphy.〔O. Kafri & I Glatt "The Physics of Moiré Metrology" J. Wiley & Sons Inc.(1990)〕
In 2012 the first application of the method for the measurement of electrone density in plasma has been published.〔J. C. Valenzuela, E. S. Wyndham, H. Chuaqui, D. S. Cortes, M. Favre, and H. Bhuyan, Implementation of moire-schlieren deflectometry on a small scale fast
capillary plasma discharge, Journal Applied Physics 111, 103301 (2012), http://dx.doi.org/10.1063/1.4719982〕 The method excels in spatial and temporal resolution comparably with a similar approach of laser schlieren deflectometry.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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