Measurement of temperature fields by holographic tomography (original) (raw)
1991, Experimental Thermal and Fluid Science
Tomographic methods are used to visualize three-dimensional fields of temperature in moving fluids as functions of time. They require a signal and a sensor for measurement purposes. The signal should be time-dependent and related to each differential volume of space. Therefore, in many cases coherent monochromatic light emitted by a laser was used to penetrate the fluid volume under investigation. The light was split into a large number of beams. The temperature field caused a change in the refractive index of the transparent fluid. The variation of the refractive index with time is indicated by a shift of the wavefront of each light beam. The sensors needed to record the variation in refractive index as a function of temperature and time are interferograms, one for each light beam taken at the same time, which are stored on photographic plates called holograms. The interferometric line patterns are digitized and numerically analyzed by computer to obtain the visualization of one three-dimensional temperature field.
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