Studies on calibration of IR radiometer by radiometric method

IR radiometers are used for the measurement of IR intensity in military, industry, academic and research domains. For real-time, noncontact, accurate measurement with high sensitivity SR 5000 radiometer is employed. It covers the waveband from 0.4-14.5 μm and has a provision to accommodate many filters and detectors. The measurements are carried out with respect to internal black body, maintained at room temperature. As any measurement equipment requires repeatable, reproducible & accurate output, calibration at regular interval is a mandatory requirement. In the current paper the calibration of radiometer in radiometric mode using different filter bands at a distance of 80 and 3 meters is described. The calibration is done at different temperatures and Planck´s function is calculated. The measured results are validated with the Planck´s function. This paper also describes the convergence of results for 80 and 3 meters.