论文部分内容阅读
In 1991, J. Labed, et al. offered a formula of passive measurement of directional emissiv-ity of object in laboratory. It is based on two preconditions, blackbody background radiation and the temperature of target (T,) different to background temperature (Tb) and the bigger the difference Δ T=Tt-Tb) is , the higher the accuracy of measurement will be. In fact, only approximate black-body exists, as Tt≠Tb, it is more difficult to satisfy the precondition of “blackbody background radiation”. Authors of this paper re-deduce this formula under the condition of non-blackbody background and a new concept of effective emissivity. Our results had been proven by Monte Carlo’s simulation and experiments. We re-explain the experimental results offered by J. Labed et al. and why εr, 3.7(θ) reduces more rapidly than εr1 10.6(θ) and εr1 12(θ) as θincreases.
In 1991, J. Labed, et al. Offered a formula of passive measurement of directional emissiv-ity of object in laboratory. It is based on two preconditions, blackbody background radiation and the temperature of target (T,) different to background temperature Tb) and the bigger difference ΔT = Tt-Tb) is higher the accuracy of measurement will be. In fact, only approximate black-body exists, as Tt ≠ Tb, it is more difficult to satisfy the precondition of "Authors of this paper under the condition of the non-blackbody background and a new concept of effective emissivity. Our results had been proven by Monte Carlo’s simulation and experiments. We re-explain the experimental Results offered by J. Labed et al. and why εr, 3.7 (θ) reduces more rapidly than εr1 10.6 (θ) and εr1 12 (θ) as θincreases.