18 May 2012 On the thermal-offset in NIR hyperspectral cameras
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Abstract
Our group has developed a Planck physics-based model for the input/output behavior of near infrared (NIR) hyperspectral cameras. During the validation of the model, experiments conducted using an NIR hyperspectral camera have shown that, when thermal radiation is used as the camera input and no illumination is present, the output offset happens to be thermally dependent, yet independent of the wavelengths in the NIR band. In this work, the effect of the incident temperature on the amount of output offset in NIR hyperspectral cameras has been experimentally studied and introduced in our previous model for such cameras. The experimental study has been conducted using an NIR hyperspectral camera in the range of 900 to 1700 [nm] and a controlled illumination set-up, while different input temperatures have been controlled by means of black-body radiator sources. The thermal-dependent offset is modeled phenomenologically from experimental data. Initial results have shown a non-linear dependence between the offset and the temperature. This thermal-offset dependence can be used to generate new NIR hyperspectral models, new non-linear calibration procedures, and establish a basis for the study of time dependent variations of the NIR thermal-offset.
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Francisca Parra, Francisca Parra, Jorge E. Pezoa, Jorge E. Pezoa, Pablo Meza, Pablo Meza, Sergio N. Torres, Sergio N. Torres, Octavio Zapata, Octavio Zapata, } "On the thermal-offset in NIR hyperspectral cameras", Proc. SPIE 8354, Thermosense: Thermal Infrared Applications XXXIV, 835411 (18 May 2012); doi: 10.1117/12.919345; https://doi.org/10.1117/12.919345
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