金属防热瓦温度及发射率的测量

Measurements of the temperature and emissivity of a metallic thermal protection blanket

为了解决金属防热瓦在连续加热过程中热边表面温度和发射率的测量问题，基于多光谱辐射测温的参考温度数学模型，提出了一种数据处理方法。该方法假设材料的光谱发射率在选定的光谱处与温度有近似相同的线性关系，通过处理2个不同温度点处的多光谱测量数据，从而得到防热瓦的真温及光谱发射率。采用多光谱辐射高温计测量了某种防热瓦在900～1300℃的温度范围内的辐射，并进行数据处理。实验结果表明：只要温度估计初值与真实情况的误差在士200℃以内，即可得到较好的计算温度值和计算发射率值，测量不确定度在2％以内。

A muhispectral thermometry reference temperature model was used to develop a method to measure temperature and emissivity of the hot side of a metallic thermal protection blanket during continuous heating at 900 ～ 1 300℃. The method assumes that the temperature and emissivity have a similar linear relationships over the spectrum. The true temperature and spectral emissivities can be simultaneously calculated by processing the measured data from the multispectral pyrometer at two different times. The results show that as long as the difference between the initial temperature and the measured target temperature is within ±200 ℃, the calculated values of the true temperature and the spectral emissivities are in good agreement with that of the measured targets. The uncertainties are less than 2%.