Solar blind pyrometry not relying on atmospheric absorption bands

Abstract

Infrared measurement of the thermal radiation emitted by solar irradiated material surfaces is the most reliable alternative to contact thermometry which is inadequate for measuring surface temperatures. However, reflected solar radiation and the use of windows for material testing in controlled atmosphere or vacuum, can be important sources of error in this non-contact methodology. A promising method for eliminating this solar perturbation is by using centered band-pass filters on the spectral bands where the solar radiation has been attenuated. Two wavelength bands are analyzed in this paper. An IR camera prototype with band-pass filters centered at these two wavelength bands and an analysis of its behavior are presented.