A thermometry method was presented for high speed flying particles in low temperature applications with difficulty in measurement. Rhodamine B was doped in cellulose acetate particles to visually show spacial temperature distribution of these particles. The ratio of 600 nm photo luminescence fluorescence signal from these dye doped particles and 532 nm laser signal for excitation was applied to further eliminate interference from laser intensity fluctuation. Spectrum of dye particles at different temperature ranging from 20 ℃ to 80 ℃ was analyzed. Photo luminescence intensity

temperature sensitivity (-0.012 5 ℃-1 temperature coefficient at 80 ℃ and -0.037 9 ℃-1 temperature coefficient at 20 ℃) and measuring accuracy were significantly enhanced with temperature decline

further proving the potential of this technology at low temperature applications. Temperature behavior of high speed dye particle hitting target was present by this technique.