Requirements for the optical insertion of thermal references sources

Howard V. Kennedy

doi:10.1117/12.155838

10 August 1993 Requirements for the optical insertion of thermal references sources

Howard V. Kennedy

Proceedings Volume 1970, Systems-Oriented Optical Design; (1993) https://doi.org/10.1117/12.155838
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

Thermal radiation sources are often used in thermal imaging sensors as reference sources for offset equalization and gain normalization of the infrared detecting elements. For best results, the `t-number' by which the detector elements view these sources must be exactly equal to that with which they view the external scene. If the t-numbers for different detecting elements are not the same, the result will be inaccurate offset equalization and imperfect gain normalization. The relationship between the scene temperature, reference source temperature, and t-number differences are derived. Quantitative values for the errors in gain and level normalization are calculated.

Citation Download Citation

Howard V. Kennedy "Requirements for the optical insertion of thermal references sources", Proc. SPIE 1970, Systems-Oriented Optical Design, (10 August 1993); https://doi.org/10.1117/12.155838

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