Design and Development of On Orbit High Emissivity Infrared Calibration Source and Measurement of its Directional Spectral Emissivity.

Abstract

Imaging in IR (infrared) satellite or payloads is sort of a temperature map. A weather satellite which is very commonly flown in the space it works based on the detection of the heat energy in the infrared spectrum (Infrared energy is invisible to human eye) and the satellite image display the object (whether clouds, water or land surface) based on the temperature of that object. It’s a need of payload to have on board and ground temperature calibration. To have better accuracy in IR image, multipoint temperature calibration is needed at on board and ground both. For payload known temperature source with high emissivity is needed with different temperature sets. Infrared Calibration Source works as known temperature source with high emissivity for calibration. Design methodology of a Pyramid shape Black body (Infrared Calibration Source) for Sea Surface Temperature Monitoring (SSTM) payload of OceanSAT mission is discussed in this present study which will work at wavelength between 4-12 µm. Also to measure the emissivity of that Black body different three experimental methodologies i.e. Calorimetric method, Infinite plate approach, Radiometric method(Transfer Radiometer) are discussed in this present study.