Many industrial blackbody furnaces are nonisothermal cavities. It is obvious that the calibrating errors of infrared(IR) thermometers are caused by those nonisothermal blackbody furnaces. In this paper, a narrow-waveband IR thermometer(Si-cell detector) is calibrated and researched by means of experiment and theoretical calculation. The law of the calibrating errors is found. According to the theory of the effective temperature of a blackbody cavity, the calibrating errors are calculated. The calculating results are basically consistent with the experiment results.
"Study And Experiment On The Calibrating Errors Of An IR Thermometer", Proc. SPIE 1157, Infrared Technology XV, (8 January 1990); doi: 10.1117/12.978582; https://doi.org/10.1117/12.978582