基于光谱发射率函数基形式不变的辐射测温技术

近年来,随着国防、工业、科技等领域飞速发展,无论是对于军用动力发射系统还是对于民用钢铁冶炼以及高科技新兴产业,辐射温度测量都具有重要意义。尤其在温度极高且伴随着瞬态测温(小于1μs)需求的场合,多光谱辐射测温法被广泛运用。多光谱辐射测温法是通过选取被测目标多个特征波长,测量特征波长的辐射信息,再假设发射率与波长相关的数学模型,最终求解得到辐射温度。目前,利用该方法实际测温时,光谱发射率都采用固定的假设数学模型,而针对目标在不同温度状态下,该固定模型则无法进行自适应变化。同样,在不同温度下,如何解算最终的发射率和辐射温度也没有普适性的方法。基于普朗克黑体辐射定律,提出一种被测目标在不同温度下光谱发射率函数基形式不变的思想,简称发射率函数基形式不变法。通过该方法,发射率模型可以根据物体在不同温度状态下,函数系数动态改变来进行自适应变化。同时对于如何解算最终的发射率和辐射温度也相应提出了普适性的方法。通过大量仿真验证以及实际测量光谱辐射照度标准灯和溴钨灯温度实验,证明本文提出的方法比现有的光谱发射率处理方法更加简单实用并且能够有效地提高光谱发射率的计算精度,从而提高辐射温度测量精度。同时具有实用性好、应用广泛等特点。

Radiation Temperature Measurement Technology Based on the Basis of Spectral Emissivity Function

In recent years,with the rapid development of the national defense,industry,technology and other fields,whether it is for the power transmission systems or for the steel smelting and new high-tech industry,temperature measurement has been of important significance .Especially in the high temperature and accompanied by the demand for transient (less than lus)temperature measurement occasion,multi spectral radiation temperature measurement method has been widely used .Multi spectral thermometry is selected by the measured target multiple wavelengths radiation information,the mathematical model of emissivity and wavelength is supposed,finally the radiation temperature is obtained .At present,when the method is used to measure the temperature,the spectral emissivity is fixed with the assumption of the mathematical model,and the fixed model is unable to adapt to the target under different temperature conditions .Similarly,at different temperatures,how to calculate the final emissivity and radiation temperature has been no universal method .Based on the Planck's law of black body radiation,this paper proposes a new idea that is based on the form invariance of the spectral emissivity function under different temperatures .According to the method,the emissivity model adapte to the dynamic change of the object according to the object under different temperature conditions .At the same time,it also puts forward a general method to calculate the final emissivity and radiation temperature .Through a lot of simulations and experiments,it is proved that the method proposed in this paper is more simple and practical than the existing spectral emissivity solution,which can effectively improve the accuracy of the calculation of spectral emissivity,so as to improve the accuracy of the radiation temperature measurement .At the same time,the method proposed in this paper has the characteristics of good practicability and wide application .