Accurate temperature measurement in thermography: an overview of relevant features, parameters, and definitions

Tjorbjohn Hamrelius

doi:10.1117/12.46457

1 March 1991 Accurate temperature measurement in thermography: an overview of relevant features, parameters, and definitions

Tjorbjohn Hamrelius

Author Affiliations +

Proceedings Volume 1467, Thermosense XIII; (1991) https://doi.org/10.1117/12.46457
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

This paper presents an overview of what features a state-of-the-art thermal imaging system needs to posses to be an accurate temperature measurement system. In thermography one of the major problems is a consequence of the fact that the surface temperature is not measured directly but is computed from the radiation received by the detector. This radiation consists not only of radiation emitted from the object but also from the surroundings, the atmosphere and the thermal imager itself. A thermal imaging system which compensates for this unwanted radiation is described. The influences from the surroundings, the atmosphere and the thermal imager is treated. The use of temperature references in the optical path, temperature sensors for measuring the imager temperature for compensation of its own radiation is described. Spatial resolution, calibration and accuracy of the imager are also discussed.

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Tjorbjohn Hamrelius "Accurate temperature measurement in thermography: an overview of relevant features, parameters, and definitions", Proc. SPIE 1467, Thermosense XIII, (1 March 1991); https://doi.org/10.1117/12.46457

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