Calibration of IR Pyrometers

Pyrometry is being used in defence and industry for temperature measurement and emissivity determination of materials. To acquire object's accurate temperature, pyrometer was to be calibrated. The calibration procedure and the results in the wavelength regions 8-14 μm, 3-5 μm and 0.9-2.5 μm for the temperature range 50-400°C, 500-1200 °C and 900-1500 °C respectively are discussed. Blackbody sources were set to different temperatures and the source temperatures were recorded using reference (RTD and pyrometer) as well as the test pyrometers. Also, temperature variation with respect to emissivity error has been estimated. The comparison between these data yielded greater correlation (correlation co-eff: >99%), which certifies that these test pyrometers con be used for non-contact temperature measurement and emissivity determination of materials.