Liquid crystal improved technique for thermal field measurements

Abstract

A highly improved liquid crystal technique for the detection of surface thermal fields is presented, which can be applied to electromagnetic field measurements. Using a monochromatic light source and varying the temperature of the sample under examination, a highly accurate plot of the thermal field, covering a large number of isothermal lines, can be obtained. The inherent resolution of 0.1°C of the cholesteric liquid crystal can be actually achieved together with a spatial resolution of ~0.05 mm.