[Mission]

The Optical Radiation Section is responsible for the realisation of the SI unit for luminous intensity (the candela) and other primary optical radiation quantities which are the infrastructure for supporting various industrial, governmental, and scientific development in Japan.

The main tasks of the Optical Radiation Section are development, improvement, maintenance and dissemination of national standard values in the fields of photometry and radiometry covering the spectrum range from vacuum ultraviolet to the infrared. And it also performs the research and development on highly precise measurements of optical radiation for providing new measurement tools needed in industry.

In addision, the Optical Radiation Section have to ensure that its standards are in accordance with internationally recognized value by participating in the international comparisons held by CCPR. So it maintains strong linkages with international standard laboratories and organizations through research, committee, and comparisons of national standards.

<Recent Research project>
  • New Realization of the Candela based on cryogenic radiometer and spectroradiometry
  • Improvement of the cryogenic radiometry
  • Improvement of the spectral irradiance scale from UV to near IR region
  • Establishment of the spectral irradiance scale in the deep UV region
  • VUV amd UV Detector calibration using cryogenic radiometer and undulator radiation
  • Establishment of spectral radiance scale in the VUV region
  • Development of LED photometric standards
  • Development of new measurement technique on absolute diffuse reflectance
  • New realization of Spectral diffuse reflectance scales