Abstract

The effect of diffraction on the moire technique was investigated in order to examine the suitability of the method in combustion diagnostics. In particular, the uncertainty, because of diffraction, in obtaining temperature profiles of flames was determined. It was found that diffractional effects play a major role in the accuracy of the results. To minimize their effect the distance between the grids must be exactly one of the Fourier image planes of the grid. Even at this condition there is an inherent error that can be precisely calculated for a given case. The error of the calculated temperature profile of a cylindrical flat flame was determined. It was found that large errors are obtained at the center of the flame and that the error has an oscillating behavior.

© 1984 Optical Society of America

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