In this paper, a new approach on measurement of spatial sensitivity of pyrometers and thermal cameras is designed. A method of scanning is developed, based on actuation of a square thermal radiation source over the field of view, utilizing deconvolution for compensation of the shape of the source. While the method appears to be versatile, it does exhibit susceptibility to temporal noise in measurement and should be used only when other methods of the Size-of-source measurements are not applicable.
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