Abstract
An optical method for measuring the 2-D temperature distribution in a horizontal plane of an asymmetric diffusion flame is studied. Using a Mach-Zehnder interferometer the method records projections of the index of refraction in the flame from eight different directions. The projection data are detected by a 1024 channel linear diode array and are then transferred to a computer which reconstructs the 2-D distribution of the refractive index and temperature by methods known from computer tomography. All data processing is governed by an interactive computer program. The tomographic reconstruction is performed by the iterative algorithm MART (multiplicative algebraic reconstruction technique), which has been modified to minimize the reconstruction errors for this type of application. The results indicate that it is possible to reconstruct the horizontal temperature field of an asymmetric and moderately hot slot flame using few (i.e. less than 10) projection angles with temperature errors less than ±10%.
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