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The aim of a common R&D project is the design and thorough characterization of a reference material for THz transmission and reflection measurements to leverage time-domain spectroscopy (TDS) for industrial applications.
PTB applied a novel thin-film pyroelectric detector in an international pilot comparison on THz power measurement below 1 THz. Due to its spectrally flat response, this detector is suitable for accurate absolute TDS power measurements and as reference material for TDS transmission and reflection measurements as well.
PTB, the National Metrology Institute of Germany, and Sensor- and Lasertechnik, a company based in Germany, developed together novel THz detectors. They are based on a coated thin film pyroelectric foil. Intensive care has been taken to their sensitivity and spectral response to make them suitable for absolute power measurement of time-domain spectroscopy systems (TDS). Their power responsivity is...
Transmittance and reflectance measurements with Fourier transform spectrometers in the MIR and FIR can exhibit significant deviations when working with cooled detectors. By measuring at two flux levels and by using an appropriate evaluation scheme systematic deviations can be largely reduced in the range from 25 µm up to 1000 µm.
The accuracy of THz detector calibration traceable to the International System of Units has been improved to a standard uncertainty below 2 % in the range from 1 THz to 5 THz. This enables PTB to offer such high precision measurements as part of its unique THz calibration services.
PTB, the metrology institute of Germany, operates the worldwide first and still unique THz detector calibration facility traceable to International System of Units. A research and development project in cooperation with a manufacturer of pyroelectric detectors is dedicated to develop suitable THz detectors.
Using THz radiation as reliable measurement tool requires the accurate knowledge of beam properties. We present approaches to scan beam profiles and measure the radiation power traceable to SI units between 0.1 and 2.5 THz.
THz power measurements traceable to the International System of Units were missing in the past. Investigations of two optical methods source- and detector-based radiometry led to the design of a new calibration facility for THz detectors by a molecular gas laser and a room-temperature radiometer.
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