Linearity Study of a Spectral Emissivity Measurement Facility

  • Z. Yuan
  • J. Zhang
  • J. Zhao
  • Y. Liang
  • Y. Duan


Linearity is one of the important characteristics of a spectral radiation measurement facility. Basically, it depends on the linearity of the spectral responsivity of the detector and amplifier at different wavelengths. As spectral emissivity is measured over wide wavelength and temperature ranges and the detection system has significant drift and noise, it is not easy to measure the linearity of this facility accurately using only one standard radiator. A simple double-blackbody method has been adopted to simulate reference emissivity samples and test the linearity of the spectral emissivity measurement facility developed at the National Institute of Metrology. Good linearity results were obtained from 3 μm to 15 μm. This method minimizes the influence of drift on the emissivity measurement over a wide ratio of measurement signals and wide spectral range.


Double-blackbody method Linearity Spectral emissivity Spectral responsivity 


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.National Institute of MetrologyBeijingChina
  2. 2.Tianjin UniversityTianjinChina

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