基于光谱分布曲线交点捕捉的辐射测温方法  

Radiation Thermometry Method Based on Intersection Capture of Spectral Distribution Curves

作　　者：王佩琦 程晓舫[1] 张德斌 WANG Pei-qi;CHENG Xiao-fang;ZHANG De-bin(Department of Thermal Science and Energy Engineering,School of Engineering Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学工程科学学院热科学和能源工程系,安徽合肥230026

出　　处：《光谱学与光谱分析》2023年第6期1676-1682,共7页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50976112)资助。

摘　　要：现代科技发展对温度的辐射测量提出了更高的要求,采用波长封闭求解温度的多波长测温法得到了广泛应用。然而准确确定被测物体发射率的函数表征是测量真实温度的难题。引入仪器测量的概念后,将确定物体发射率的难题转化为确定仪器发射率模型,用物体与仪器发射率光谱分布曲线的交点波长构造真实温度封闭求解的条件,是辐射测温的一大进步。研究提出采用波段积分消除物体辐射二元函数带来的波长对测温的影响,并且积分中值波长恰巧可以取代交点波长,结合“谱色函数”实现了对上述曲线交点的捕捉,完成了真实温度的测量。需要明确,测温所需波长个数并非越多越好。对普朗克定律中第一、第二辐射常数进行修定,得到了广义测温模型,使得测量所需波长数目限定为“3”,其可以作为普朗克定律与发射率级数模型乘积表征所需测温波长的下限数目,这是辐射测温的另一突破。用物体辐射定义层面上的数学形式表示广义模型,实现广义模型与线性仪器发射率的对接。在可见光与近红外大气窗口波段内,对广义模型和仪器测量方程进行数值拟合,验证了定义式与广义模型在任意波段内的适应性。在可见光波段内,对金属钨的实验数据进行仿真计算,结果表明:广义模型通过调整有限的待定参数,很好地还原了金属钨的辐射数据;“谱色函数”的设计能够实现对测温波长的有效分辨;计算得到金属钨的温度相对误差均小于0.15%,证明基于光谱分布曲线交点捕捉的测温方法是实现物体真实温度辐射测量的有效途径。With the development of modern science and technology,higher requirements are put forward for radiation measurement of temperature,and multi-wavelength thermometry using wavelength closure to solve temperature has been widely used.However,it is difficult to determine the functional representation of the emissivity of the measured object to measure the real temperature.After introducing the concept of instrument measurement,the problem of determining object emissivity is transformed into a model of determining instrument emissivity.It is great progress in radiometric temperature measurement to construct the closed solution condition of real temperature using the wavelengths,which are the intersections of spectral distribution curves of emissivity of object and instrument.Based on this,a method of band integral is proposed to eliminate the influence of wavelength on temperature measurement caused by the binary function of object radiation,and the median wavelengths of the integral can replace the wavelengths of intersections.Combining with the“spectral color function”,the intersections of curves can be captured,and the measurement of real temperature is completed.It should be clear that the number of wavelengths required for temperature measurement is not the more,the better.By modifying the first and second radiation constants of Planck’s law,the generalized temperature measurement model is obtained,and the number of wavelengths required for measurement is limited to“3”,which can be used as the lower limit number of temperature measurement wavelengths required for the product of Planck’s law and emissivity series model.It is another breakthrough in radiation temperature measurement.The mathematical form on the definition level of object radiation represents the generalized model,and the connection between the generalized model and the emissivity of the linear instruments is realized.In the visible and near-infrared atmospheric window bands,the generalized model and instrument measurement equation is nu

关 键 词：真实温度 波段积分 交点波长 广义模型 波段适应性 

分 类 号：O432.1[机械工程—光学工程]