1985 Volume 21 Issue 11 Pages 1196-1201
This report proposes some schematic optical systems for the temperature measurement of hot gases using double optical path method. As for the temperature measurement of hot gases with optical method, it is necessary to determine the emissivity and the radiance of them. The discussion here extends to three systems for measurement of the emissivity and two ones for the radiance. In each system, there are two optical paths which are prepared for the determination of the emissivity and the radiance in terms of radiative intensities observed through the both paths. These paths are assumed to have automatic balancing mechanism with the optical zero method.
Firstly shown are the basic equations of the emissivity and the radiance which are measured by the proposed optical systems, under the condition that the hot gases are in the state of thermal equilibrium and have axial symmetry. Nextly considered are several actual systems for temperature measurement which are composed of particular ones of the above-mentioned emissivity radiance measuring systems, and shown are the basic equations of the hot gas temperature which are determined using these actual systems.
Finally assessed are the characteristics of these systems using the above basic equations.
