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.
In order to exploit new possibilities of THz sensing and imaging, it is not only necessary to generate and detect THz
radiation but also to measure the radiant power of the THz sources and the responsivity of the detecting systems
traceable to the international system of units (SI). This has been missing in the THz range up to now. The Physikalisch-
Technische Bundesanstalt (PTB) has focused on this challenging task by using two complementary optical approaches:
source- and detector-based THz radiometry. Both methods have been successfully prototyped, and a pyroelectric THz
detector with known aperture was used to verify the consistency of the two independent calibration methods.
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