Features of the Drummond Light of Calcium Oxide

摘要

It is shown by optical spectroscopy and He-Ne laser backscattering that the so-called Drummond light of calcium oxide (dazzling bright white light) is equilibrium and caused by the transformation of this material a at certain threshold temperature (2000 K) from an analog of ideal white body (in the optical range) with an emissivity of about 0.1 into an almost ideal black body with an emissivity close to 1. Previously, it was believed that the intensity of this light approximately coincides with that of black body at temperatures above 900 K and exceeds the latter at lower temperatures due to luminescence.