Effect of Ambient Temperature on Calibration of Cooled Thermal Camera

  • Amit Kumar Sharma Defence Laboratory, Jodhpur and Jai Narain Vyas University, Jodhpur
  • Sanjay Kumar Sharma Defence Laboratory, Jodhpur
  • Prashant Vasistha Defence Laboratory, Jodhpur
  • Jagdish Prasad Mangalhara Defence Laboratory, Jodhpur
DOI: https://doi.org/10.14429/dsj.67.9820
Keywords: Calibration, Calibration drift, thermal camera, Ambient temperature

Abstract

Thermal cameras may be used under ambient conditions that differ significantly from the calibration conditions. The effect of ambient temperature on temperature measurement error is examined for MWIR and LWIR cooled thermal cameras. The facilities used include an environmental chamber and an extended area blackbody with temperature controller. Significant differences were observed in the temperatures measured by the cameras placed in different ambient temperatures, with reference to the set blackbody temperatures. Re-calibration was done to account for variations in ambient temperature from 5 ºC to on the outputs of the cameras. It was found that after such recalibration, the measurement error was within acceptable accuracy of ±1 °C.

Author Biographies

Amit Kumar Sharma, Defence Laboratory, Jodhpur and Jai Narain Vyas University, Jodhpur

Mr Amit Kumar Sharma has completed the MSc (Physics) from University of Rajasthan and presently pursuing PhD from JNV University, Jodhpur. He has been working at Defence Laboratory, Jodhpur. His areas of research include: Thermal signature measurement, and management of military vehicles. He has an experience of 12 years in the area of thermal camouflage.

Sanjay Kumar Sharma, Defence Laboratory, Jodhpur

Mr Sanjay Kumar Sharma has completed the BE Electronics and Communication) from Punjab Technical University, Jalandhar. He has also completed the MTech (Instrument Technology) from IIT, Delhi. He has been working at Defence Laboratory, Jodhpur in the area of thermal signature measurement, and management of military vehicles. He has an experience of 15 years in the area of thermal camouflage.

Prashant Vasistha, Defence Laboratory, Jodhpur

Dr Prashant Vasistha has completed his PhD from Department of Electronics Engineering, IIT BHU. He has been working at Defence Laboratory, Jodhpur in the area of Radar cross section (RCS) studies and RCS measurements technologies for combat systems. He has an experience of 18 years in the area of Radar camouflage.

Jagdish Prasad Mangalhara, Defence Laboratory, Jodhpur

Dr Jagdish Prasad Mangalhara has completed the MSc (Physics) and PhD from Indian Institute of Technology, New Delhi. He has been working at Defence laboratory, Jodhpur in the area of thermal signature measurement, and management of military vehicles. He has an experience of 25 years in the area of thermal camouflage.

Published
2017-03-14
How to Cite
Sharma, A., Sharma, S., Vasistha, P., & Mangalhara, J. (2017). Effect of Ambient Temperature on Calibration of Cooled Thermal Camera. Defence Science Journal, 67(2), 173-176. https://doi.org/10.14429/dsj.67.9820
Issue
Vol 67 No 2: Infrared Technologies
Section
Special Issue Papers
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