A spectrometer with a photodetector array, which consists of 512 InGaAs-based pixels and is sensitive to IR radiation at wavelengths of 0.9–2.5 μm, is described. It allows registering of thermal-radiation spectra of objects with unknown emissivities and calculation of their temperatures near 400 and 500–600 K at storage times of 100–500 and 10 ms, respectively.
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Magunov et al. (2014) studied this question.
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