The visualization of a quasi-stable flow field with full 3-D meaning must be provided with 2-D projections. In flow field interfero-metric tomography, the conventional method of fringe tracking, by which a few solitary 1-D projections are obtained, can evaluate only the 2-D distribution of the field on a limited number of cross sections. A new method that combines Fourier analysis and modified multigrid iteration is proposed to extract 2-D projections from interferograms of the measured field in various 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-Pérot (F-P) interferometer is reported and some cross sections of the reconstructed temperature field are given to prove that the methods of sampling, processing and reconstruction of the algorithm illustrated are effective. # 1998 Society of Photo-Optical Instrumentation Engineers. S0091-3286(98)00110-X Subject terms: three-dimensional reconstruction; interferometric tomography; phase unwrapping; wavefront retrieval. Paper 18117 received Nov. 25, 1997; revised manuscript received Apr. 14, 1998; accepted for publication Apr. 15, 1998.
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