建立了被检辐射温度计和标准辐射温度计只因两者工作波长不同而产生的亮度温度差（精度）的理论公式．此公式内涵表明了由于黑体空腔总精度的不等温分量几乎与波长无关，所以大幅度地降低了上述亮度温度差的差值，即与标准接触式温度计相比大大提高了红外辐射温度计的标定精度．本文还列举了几种典型黑体空腔温度分布的例子，给出了标准与被检温度计因工作波长不同而产生的亮度温度差的走向 The theoretical formula of brightness temperature difference (accuracy) which is produced only by the difference of the working wavelength of the two radiant thermometers and the standard radiation thermometer is established. The connotation of this formula shows that because the unequal temperature component of the total accuracy of the blackbody cavity has almost nothing to do with the wavelength, the difference of the brightness temperature difference is greatly reduced, that is, the calibration of the infrared radiation thermometer is greatly improved compared with the standard contact type thermometer Accuracy. This paper also lists several typical blackbody cavity temperature distribution examples, given the standard and was seized thermometer due to different working wavelength brightness temperature difference arising from the trend