基于光谱响应定标的辐射测温方法

Radiation Thermometry Based on Calibration of Spectral Responsivity

辐射测温是通过测量物体发出的辐射来反演温度,辐射测量方程中含有与空间位置相关的非光谱参数,通常需通过辐射标定予以确认。而该研究将非光谱参数归入有限项级数形式的光谱发射率中,这既不会影响多通道测温方程组的封闭性,又不会影响真温求解,从而在无需测量数据归一化的条件下,实现了无需空间位置标定的辐射测温,该方法仅需要标定仪器的绝对光谱响应或相对光谱响应,但不能解得发射率。以两个特例分别对多波长测温方法和多谱段测温方法的求解特性进行了研究。结果表明:对于任意的测量矢量,有效波长不相同的多波长测温唯一解是存在的;而多谱段测温时,存在无解区域,双解直线,甚至可能存在三解直线。

True surface temperatures can be determined by measurements of radiation emitted by the object. The non-spectral parameter in the radiation measurement equation is the function of the relative position between the target and the lens, so calibration of space position is necessary for temperature measurement, when emissivity and temperature are measured simultaneously. In the present paper, the non-spectral parameter was included into the undetermined coefficients of emissivity modeled by finite series, which will not affect the solution of true surface temperature. Therefore, radiation thermometry can be accomplished without calibration of space position and normalization of measurement data. And not the true spectral emissivity but the trend of it can be measured. Two special examples were investigated, respectively. The results indicate that when the effective wavelength of each channel is different, multi-wavelength radiation thermometry equations have the unique solution, while the number of the multiband ones may be zero, one, two or even three.