Calibration of 253.7 nm irradiance based on the silicon photodiode self-calibration technique

  • Ohkubo Kazuaki
    Lighting Research Laboratory, Matsushita Electric Ind. Co., Ltd.
  • Ohno Yoshihiro
    Lighting Research Laboratory, Matsushita Electric Ind. Co., Ltd.

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  • シリコンフォトダイオードの自己校正法に基づいた253.7nm放射の絶対測定
  • シリコン フォトダイオード ノ ジコ コウセイホウ ニ モトズイタ 253.7

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An attempt was made to develop a new method to measure the bactericidal irradiance (253. 7 nm) accurately based on the silicon photodiode self-calibration technique. The absolute responsivity of a silicon photodiode was determined at 632.8 nm with self-calibration technique. The absolute responsivity at 253. 7 nm of the photodiode was determined by the relative spectral responsivity measurement using a spectral responsivity standard which is a thermal detector. Pure bactericidal radiation was generated from the combination of a bactericidal lamp (GL-15) and an interference filter which has a pass-band of only around 253. 7 nm, and its irradiance was calibrated using the silicon photodiode with an aperture of known opening area. Using the calibrated radiation, any bactericidal irradiance detector can be calibrated accurately.

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