Abstract
Part of the calibration of the Thermal Infrared Sensor (TIRS) currently on the Landsat Data Continuity Mission was performed using the TIRS Flood Source, a 16” diameter blackbody. This presentation discusses the calibration of the TIRS Flood Source for absolute radiance after the Flood Source had been used to calibrate TIRS. The Flood source calibration was performed at Space Dynamics Lab (SDL) by comparing the output of the Flood Source to the SDL Long Wave Infrared Calibration Source (LWIRCS) blackbody using the SDL transfer radiometer (SDL-XR). LWIRCS is a calibrated, high-emissivity, 2 to 100 micron blackbody and the SDL-XR is a combination radiometer and spectrometer that was used in spectrometer mode with a filter that included the 10.8 and 12 micron TIRS bands. The Flood Source radiance was measured at 10 temperatures from 240 to 345 K, and at several horizontal positions and at several incidence angles. Flood Source effective emissivity was found to be 0.992+/-0.003 at all temperatures with no variation in horizontal position or incidence angle.
TIRS Flood Source Calibration
Part of the calibration of the Thermal Infrared Sensor (TIRS) currently on the Landsat Data Continuity Mission was performed using the TIRS Flood Source, a 16” diameter blackbody. This presentation discusses the calibration of the TIRS Flood Source for absolute radiance after the Flood Source had been used to calibrate TIRS. The Flood source calibration was performed at Space Dynamics Lab (SDL) by comparing the output of the Flood Source to the SDL Long Wave Infrared Calibration Source (LWIRCS) blackbody using the SDL transfer radiometer (SDL-XR). LWIRCS is a calibrated, high-emissivity, 2 to 100 micron blackbody and the SDL-XR is a combination radiometer and spectrometer that was used in spectrometer mode with a filter that included the 10.8 and 12 micron TIRS bands. The Flood Source radiance was measured at 10 temperatures from 240 to 345 K, and at several horizontal positions and at several incidence angles. Flood Source effective emissivity was found to be 0.992+/-0.003 at all temperatures with no variation in horizontal position or incidence angle.