1.2 - Absolute Mid-infrared Spectral Responsivity Scale Based on Thermal Detectors and the Cryogenic Radiometer
- AMA Conferences 2017
2017-05-30 - 2017-06-01
- Proceedings IRS² 2017
- I1 - IR Sensors and Arrays
- R. Taubert, P. Meindl, C. Monte, L. Werner, T. Pohl, J. Hollandt - Physikalisch-Technische Bundesanstalt, Berlin (Germany)
- 749 - 753
The Physikalisch-Technische Bundesanstalt (PTB) has extended its capability for the realization and dissemination of the absolute spectral responsivity of thermal detectors from the near-infrared into the mid infrared (MIR) wavelength range. The calibration method relies on the application of a large area, multi-junction thin film thermopile detector as a transfer standard, characterized with two independent approaches in terms of its MIR spectrally flat (in a word: grey) relative spectral responsivity. The required SI traceability is achieved through absolute calibrations in the wavelength range from 1.5 μm to 2.4 μm against the PTB national detector standard, the cryogenic electrical substitution radiometer. In combination with an upgraded MIR dedicated spectral comparator setup, this allows the measurement and dissemination of the spectral responsivity up to a wavelength of 5 μm with relative standard uncertainties below 2 %.