High Temperature Calibration of Thermal Imagers for Infrared Measurements on Military Platforms

摘要

Calibration of thermal imaging system is not a straight forward process and hence manufacturers suggest re-calibration at factory itself. However, it is time consuming and expensive. A few research papers refer various approaches to perform low temperature calibration considering the wide requirement of low temperature measurements (typically less than 150 degrees C). However, no reference is available in open literature about high temperature calibration of thermal imagers. Hence, the possibility of high temperature calibration of thermal imaging systems has been explored using high temperature blackbody sources available at laboratory. With the use of neutral density filters, calibration has been performed in mid-wave (3.7 mu m - 4.8 mu m) and long-wave (7.7 mu m - 9.5 mu m) bands of imagers for IR measurements. The developed calibration has also been tested for field measurements.