The visualization of a quasi-stable flow field with full 3-D meaning must be provided with 2-Dprojections. In flow field interferometric tomography, the conventional method of fringe tracking, bywhich a few solitary 1-D projections are obtained, can evaluate only the 2-D distribution of the fieldon a limited number of cross sections. A new method that combines Fourier analysis and modifiedmultigrid iteration is proposed to extract 2-D projections from interferograms of the measured field invarious directions. On the basis of 2-D projections, the real 3-D field reconstruction can be realized.An experiment with an asymmetric temperature field measurement using a rotary Fabry-Perot (F-P)interferometer is reported and some cross sections of the reconstructed temperature field are given toprove that the methods of sampling, processing and reconstruction of the algorithm illustrated areeffective.
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