The measurement of radiative heat flux in a large, sooty pool fire is difficult because of a number of fire-induced problems. A large pool fire (say, 10 m × 10 m) generates significant amounts of soot, which coats and clogs almost any device placed within the fire. Temperatures in the fire can reach 1500 K, which also presents a problem for most measuring devices. A new multisensor transpiration radiometer has been developed that can survive the severe environment of a sooty pool fire and measure the incoming radiative fluxes from five orthogonal directions. The new radiometer is described along with the characteristics of a sooty pool fire that are important for measuring heat flux and temperature.
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