On the Measurement of the Three-Dimensional Temperature Field by the Mach-Zehnder Interferometer

抄録

the present method is based on the fringe shifts of interferograms from different ray directions around a temperature field. The contours of the temperature field are obtained from the envelopes drawn at the boundary of each fringe shift. Temperatures are evaluated by solving the simultaneous equations of the first degree for the unknown refractive indices at the grid points in the contours of the temperature field. The method has been applied to the temperature fields of natural convention caused by heated plated, as well as to those of heated air jets with rectangular exit. The results have been compared with the temperatures measured by a thermocouple. It is found that the present method may be useful in evaluating temperatures and/or densities in some complex fields.