基于牛顿迭代法高温光谱温度和发射率的反演研究

发布时间：2018-01-31 14:05

本文关键词： 温度反演材料发射率牛顿迭代法高温光谱　出处：《光谱学与光谱分析》2017年05期 　论文类型：期刊论文

【摘要】：针对基于光谱数据进行温度与发射率分离过程中存在的n个方程包含n+1个未知数这一欠定问题,提出利用牛顿迭代法来实现材料表面真温及发射率的反演计算,通过给定温度和发射率初值,利用泰勒级数的线性项建立迭代公式,通过迭代得到温度和发射率的近似解。分别利用理论热辐射谱和腔黑体的实验数据进行验证,结果表明,任意给定温度和发射率初值均可获得与真实温度接近的计算温度值,相对误差小于0.09。发射率反演结果与真实发射率线形一致,当温度和发射率初值越接近真实温度和发射率时,发射率反演结果越精确。该方法消除了发射率假定模型限制,有望应用于高温及超高温下各种材料真实温度和光谱发射率研究。
[Abstract]:In the process of temperature and emissivity separation based on spectral data, n equations contain n 1 unknown number. Newton iteration method is used to calculate the true temperature and emissivity of the material surface. The iterative formula is established by using the linear term of Taylor series through the initial values of given temperature and emissivity. The approximate solutions of temperature and emissivity are obtained by iteration. The experimental data of theoretical thermal radiation spectrum and cavity blackbody are used to verify the results. At any given temperature and initial emissivity, the calculated temperature values close to the real temperature can be obtained, and the relative error is less than 0.09.The result of emissivity inversion is consistent with the true emissivity line shape. When the initial values of temperature and emissivity are closer to the real temperature and emissivity, the inversion results of emissivity are more accurate. This method eliminates the limitation of the assumed emissivity model. It is expected to be applied to the study of real temperature and spectral emissivity of various materials at high and ultra high temperatures.
【作者单位】：长春理工大学理学院;西安应用光学研究所;
【分类号】：O433.1
【正文快照】： 引言多光谱辐射测温属于非接触测温,因其精度高,不受物质状态、气氛及等离子体干扰而具有广泛应用。光谱测温建立的理论基础是普朗克定律,但在应用中涉及到实际物体的发射率,而实际物体的发射率表现复杂,给深入研究和实际应用带来了很多困难和不确定性,发射率问题成为辐射测温

【相似文献】