“…The SPS model simply assumed the flame radiation is emitted from a point in the center of the flame volume and independent of the flame shape. As an improvement over the SPS model, the WMP model considers radiation being emitted from multiple point sources distributed along the flame axis [7] . The SFM went further to assume that the flame is a prism with the bottom of the fire source as the base, emitting uniform radiation from the entire flame surface [8] .…”