Image reconstruction of three dimensional temperature field from projections in optical tomography

It is well known that determination of temperature fields by holographic interferometry is a successful method in the measurement of thermophysics. In this paper, some practical algorithms for image reconstruction from projections are presented to produce the temperature field. Algorithms being developed include that the Radon transform integral equation is directly solved by a grid method, and that the Radon inversion formula is numerically evaluated by two-dimensional Fourier transform technique. Some examples are given to verify the validity of the above methods in practice. A heat air flow above conbustor with a rectangular hole is investigated by holographic interferometric system, and temperature distributions of two sections in the air flow field have been reconstructed by this methods.