Abstract
Abstract. The Physikalisch-Technische Bundesanstalt (PTB) expanded its capabilities of the absolute measurement of radiant power to the spectral range of the mid-infrared (MIR) by implementing additional MIR laser radiation sources at one of the PTB's cryogenic electrical substitution radiometer facilities. This extension enables absolute calibrations of the spectral responsivity of detectors in the MIR traceable to the International System of Units (SI). The thermopile detector TS-76 was characterized and calibrated in view of its spectral responsivity s(λ) in the wavelength range between 1.5 and 10.6 µm at the expanded cryogenic electrical substitution radiometer facility. The relative standard measurement uncertainty was significantly reduced to 1.4 % by developing an optimized and thermally stabilized detector housing design. The TS-76 was established as a mid-infrared transfer detector for the SI traceable measurement of radiant power and the dissemination of the spectral responsivity s(λ) in the MIR.
Highlights
Radiation detectors for the near-infrared (NIR) and midinfrared spectral range are widely needed for different applications, e.g. remote sensing (Allison et al, 2016) or measurement of climate-relevant atmospheric molecules (Rothman et al, 2013)
The TS-76 was established as a mid-infrared transfer detector for the System of Units (SI) traceable measurement of radiant power and the dissemination of the spectral responsivity s(λ) in the MIR
E.g. the radiometric measurement of thermodynamic temperatures (Gutschwager et al, 2013), require high-accuracy traceability of the radiometric measurements to the International System of Units (SI), which is realized by national metrology institutes like the Physikalisch-Technische Bundesanstalt (PTB) by operating primary radiometric detector standards such as electrical substitution radiometers
Summary
Radiation detectors for the near-infrared (NIR) and midinfrared spectral range are widely needed for different applications, e.g. remote sensing (Allison et al, 2016) or measurement of climate-relevant atmospheric molecules (Rothman et al, 2013). Some of these applications, e.g. the radiometric measurement of thermodynamic temperatures (Gutschwager et al, 2013), require high-accuracy traceability of the radiometric measurements to the International System of Units (SI), which is realized by national metrology institutes like the Physikalisch-Technische Bundesanstalt (PTB) by operating primary radiometric detector standards such as electrical substitution radiometers. The cryogenic electrical substitution radiometer facility, its expansion for the MIR and the optimization, and calibration of the thermopile detector TS-76 to be used as a transfer detector will be described
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