Heat flow visualization and temperature measurement of low-density environments using laser holographic interferometry

摘要

Heat flows in low-density environments are generally difficult to visualize using optical methods due to the low refractive index of the medium (air). In this work, we attempt to visualize a temperature field in a low-density environment with the aid of laser holographic interferometry. Low-density environments are achieved using natural convection fields under a circular disk cooled by a thermoelectric cooling device which is set in a vacuum-pomp-evacuated chamber.