To understand the behavior and performance of a new 100 kW pilot scale pressurized oxy-coal reactor, radiation measurements of the flame have been made using a Fourier Transform Infrared (FTIR) spectrometer. From these radiation measurements, gas temperatures were obtained using integrated spectral infrared (ISIR) emission from the CO2 and water vapor of the combustion product gases. Radiative emission from the product gases in the reactor were collected through a quartz window 1.524 m downstream of the burner. An optical probe focused culminated emission from the combustion chamber into a silica fiber which transported the radiative signal to the spectrometer. The method produced both wall and gas temperatures as well as total integrated intensity. Values for wall temperature ranged from 1150 to 1450K and gas temperatures ranged from 1150 to 1680K. The wall and gas temperature measurement trends were consistent with expected trends with periods of increasing and decreasing fuel flow rates. Temperatures could not be verified by independent measurements, but the absolute uncertainty of the gas temperature was estimated to be +100 and -50 K in the worst case, with the largest source of uncertainty being due to window fouling. These temperature and integrated intensity values were compared to measurements taken using thermocouple and radiometers at the same axial location on the reactor.