抄録
A new radiation thermometry method uses a reciprocity relationship between two uniquely defined spectral emissivities of a target whose surface characteristics may change during the period of observation. Emissivity variation of galvannealed steel due to iron-zinc alloy crystallization was measured experimentally, and the relationship between two emissivities at 1.6 and 3.0μm was defined over the temperature range 700 to 800K. Temperatures calculated by the new method showed excellent agreement with the true temperatures (±2.7K) while the conventional spectral and ratio methods yielded agreement within ±33 and ±4.4K, respectively. This method has potential for a wide variety of applications due to the simplicity of its principle.
