27 August 2010 Calibration of far-IR and sub-mm detectors traceable to the international system of units
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Precision power measurement of electromagnetic radiation is required to establish metrological applications, e.g. remote sensing. The Physikalisch-Technische Bundesanstalt (PTB), as the national metrology institute of Germany, has started to determine the spectral responsivity of detectors for THz radiation. In this work, the THz spectral range denotes the wavelength range from 60 μm to 300 μm, corresponding to 5 THz to 1 THz, which is traditionally the overlap between far-IR and the sub-mm range. Traceability of power measurement to the international system of units (SI) has been missing in the THz region in the past. The PTB establishes this traceability by using two complementary optical approaches, source- and detector-based radiometry. Both methods have been successfully prototyped. These primary investigations led to the design of a new measurement facility for the determination of THz radiant power and the responsivity calibration of THz detectors traceable to the SI.
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Ralf Müller, Berndt Gutschwager, Christian Monte, Andreas Steiger, and Jörg Hollandt "Calibration of far-IR and sub-mm detectors traceable to the international system of units", Proc. SPIE 7808, Infrared Remote Sensing and Instrumentation XVIII, 78081E (27 August 2010); doi: 10.1117/12.859450; https://doi.org/10.1117/12.859450

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