A novel pyranine-based luminescent temperature sensor was embedded within water ice to study heat transfer dynamics of blunt-nosed ablating bodies in supersonic and hypersonic flows. A circular half cylinder and sphere test article were created out of water ice with an embedded temperature sensitive layer to observe cross-sectional temperature profiles. The half cylinder and sphere were exposed to flow with stagnation temperatures of 700 K and 800 K at Mach 2 and Mach 7 respectively. The luminescent sensor successfully measured the amount of ablated material and the temperature profiles inside of the test articles during convective heating. The cumulative heat absorbed by the test articles as a function of time was calculated from the ablated material and the temperature rise measured from the luminescent sensor. The calculated cumulative heat was then compared to analytical estimates for convective heating of blunt-nosed bodies in high-speed flows and shown to be in good agreement.