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Infrared Radiometry

Working Group 7.32


Realization and dissemination of the International Temperature Scale by radiation thermometry
Poster WG 7.32 (in German)

The working group's main task is non-contact temperature measurement in the range from ‑170 °C to 962 °C at the highest metrological level, i.e. the realization and dissemination of the International Temperature Scale ITS‑90 by radiation thermometry. The measurement of the spectral radiance from the near to the far infrared in the wavelength range from 1 µm to 1 mm and the measurement of the spectral emissivity in the temperature range from ‑40 °C to 1000 °C are closely related tasks.

For this purpose, the WG operates measurement facilities with national measurement standards in air and in vacuum to characterize radiation thermometers, infrared camera systems, radiation standards and to measure the emissivity.

The working group thus ensures the metrological traceability of high-temperature radiation thermometry and of applied radiometry to the International System of Units (SI) for customers from industry and research and for other national metrology institutes.

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  • Further development of the realization and dissemination of the International Temperature Scale of 1990 in the range from -170 °C to 1000 °C by radiation thermometry and radiometry
  • Further development of the measurement capabilities for the spectral emissivity
  • Radiation thermometry and infrared radiometry in vacuum for the traceability of remote sensing and of meteorological and climate observations
  • Determination of optical properties in the infrared spectral range
  • Development of application-specific traceability concepts for infrared radiation thermometry and infrared radiometry, for quantitative thermography and for emissivity measurements such as:
    • Industrial applications (-196 °C to 1000 °C)
    • Satellite-, aircraft- and ground-based optical remote sensing of the atmosphere and Earth (-90 °C to 100 °C)
    • Earth- and space-based astronomy (1 µm to 1 mm)
    • Energy generation
    • Thermal insulation
  • Determination of the properties of complex optical materials and surfaces (scattering, textured) from the near IR to the THz range with high lateral resolution
  • Development of novel, high-emitting surfaces for reference sources from the visible to the THz spectral range
  • Participation in activities of national and international committees in the fields of radiation thermometry, emissivity measurement and radiometric traceability of remote sensing

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The following services are carried out in working group 7.32 in accordance with the Opens external link in new windowQM Manual of Division 7:

  • Calibration of radiation thermometers and thermographic cameras
  • Calibration of cavity radiators and infrared surface radiators
  • Measurement of the directional spectral emissivity, of the directional total emissivity and of the hemispherical emissivity
    in air and in vacuum at temperatures from -40 °C to 600 °C
    and in the wavelength range from 1 µm to 200 µm
  • Calibration of the spectral radiance of radiation sources
    in the spectral range from 1 µm to 200 µm
  • Calibration of the directional transmittance and reflectance
    in the range from 5 µm to 1000 µm


Do not hesitate to ask us for further information and a more detailed description of our offers and services. For measurement tasks not included in the above-mentioned calibration and measurement services, there is, in addition, the possibility of a research cooperation.

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