A Method for Eliminating Beam Steering Error for the Modulated Absorption-Emission Thermometry Technique

Modulated absorption-emission thermometry (MAET) is a non-intrusive, radiometric technique for measuring line-of-sight average temperature in high-temperature gases. The technique uses alternating measurements of emission and transmission to obtain the emissivity and the radiative intensity of the gas over a spectral band. The temperature is then calculated from the Planck function. The technique does not involve the measurement of spectral features such as line widths or strengths and therefore is suitable for high-pressure environments where spectral lines are broadened and merged. It is also suitable for environments where broadband emitters such as soot are present. The original document contains color images.