Abstract: This paper reports our experimental research on infraredradiation in reentry flows. The experiments are conducted in the oxygen-hydrogendetonation driven shock tunnel JF-10. Total enthalpy of the particular runamounts to 15.5 MJ/kg, pressure in the reservoir is 19.6 MPa, and thegenerated free stream velocity is approximately 5 km/s. InSb multi-elementinfrared imaging system is used to measure the infrared radiation.Taking a sphere-nosed blunt cone as the test model, the transverse infraredradiation power profiles in the shock layer and wake are obtained. The datashow some unique features. Infrared radiation is weak near the wall, strongand relatively uniform in the middle region of the shock layer, and becomesweak again in the outer part of the shock layer. In the wake, the radiationis the strongest near the symmetric axis and becomes weaker monotonically whiledeparting from the axis.