No.5（2010）9.Development of calibration system for spectral radiance measurement

Toshihide Iwanaga, Hirotaka Nakamura, Mizue Ebisawa, Tetsuo Yamamoto

  We investigated a calibration system in which a spectral irradiance halogen lamp and a diffuser were used for measuring spectral radiance for the photobiological safety of lamps and lamp systems. We measured the spectral reflectance of a diffuser (PTFE and BaSO4) with a changing angle of detection. Deviation from Lambert's cosine law of spectral reflectance is the smallest in the vicinity of 40 degrees. This result shows that the angle is suitable for the detection angle. We measured the spacial nonuniformity of radiation from a spectral irradiance standard lamp, which is about 0.8% less. The influence of the nonuniformity upon spectral radiance measurement was found to be small. As a result, we showed this calibration technique was an effective method for spectral radiance calibration.

Keywords

Spectral radiance, Photobiological safety of lamps, Diffuser, Spectral irradiance, Lambert's cosine law

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