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The calibration measurement setup.
The signal step function of the scan (filled squares -∎-), the sigmoidal fit (black line), the derivative (open squares -◻-) and the Gaussian fit (filled circles -●-). The width of the Gaussian fit was .
The dependence of the minimum resolvable temperature difference as a function of the normalized aperture diameter .
The thermal image of the miniature IR emitter as measured in two spectral ranges: (a) (without a filter); (b) (with a filter).
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