细分光谱高温测温线性拟合方案的研究

A STUDY ON THE LINEAR FIT SCHEME OF FINE SPECTRA FOR MEASUREMENT OF HIGH TEMPERATURE

按照ＰＩＳ－Ａ型瞬态光谱仪的数据格式，用普朗克公式计算１０００～６０００Ｋ黑体的光谱辐射代替实测辐射，分析了减小线性拟合方案测温误差的方法．研究表明，适当选择参与拟合数据波长的上下限、提高信噪比和Ａ／Ｄ转换位数，并对维恩近似带来的系统误差进行校正补偿等措施，可有效提高测温精度．

According to the datum form of the PIS-A Instant Spectrometer,the spectral exitance of blackbody of 1000￣6000 K was calculated with the Planck's formula to replace the value measured by the PIS-A Instant Spectrometer and some methods of reducing the error of the linear fit scheme were analyzed.This study indicates that a proper selection of upper and lower limits of the wavelengths in fitting operation,the increase of the signal-to-noise ratio and the digits of A/D conversion, and the compensation for the system error caused by the approximation of the Wien's formula to the Planck's formula, can effectively improve the accuracy of measurement.