Moiré deflectometry
Moiré deflectometry produces result that appears similar to an interferometry technique,[1][2] 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. A similar implementation in wind tunnel application for quantitative measurement is moire schlieren, a variation of schlieren photography.[3]
In 2012 the first application of the method for the measurement of electron density in plasma has been published.[4] The method excels in spatial and temporal resolution comparably with a similar approach of laser schlieren deflectometry.
References
[edit | edit source]- ^ O. Kafri Optics letters 1980; 5,555
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- ^ O. Kafri & I Glatt "The Physics of Moiré Metrology" J. Wiley & Sons Inc. (1990)
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