Development of a High Speed Measurement of Atmospheric Trace Species Using High Repetition Rate Cavity Ring-Down Spectroscopy

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  • IDA Akira
    1Graduate school of Global science and Environmental Study, Kyoto University
  • NAKAMURA Kiyotaka
    Urban Environmental Science, Tokyo Metropolitan University
  • KAJII Yoshizumi
    1Graduate school of Global science and Environmental Study, Kyoto University Center for Regional Environmental Research, National Institute for Environmental Studies

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  • 高繰り返しレーザーを用いたキャビティリングダウン分光法による 高速時間分解大気微量成分濃度測定装置の開発
  • Laser Original 高繰り返しレーザーを用いたキャビティリングダウン分光法による高速時間分解大気微量成分濃度測定装置の開発
  • Laser Original コウクリカエシ レーザー オ モチイタ キャビティリングダウン ブンコウホウ ニ ヨル コウソク ジカン ブンカイ タイキ ビリョウ セイブン ノウド ソクテイ ソウチ ノ カイハツ

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Abstract

A high performance Cavity Ring-Down Spectroscopy (CRDS) system has been developed for measurements of atmospheric NO2 and H2CO. Combination of a frequency doubled tunable dye laser pumped by a high sampling rate A/D system enabled accumulation of 10000 shots of ring-down signal every 4 seconds. The A/D system sampling rate is 100 MS/s and the vertical resolution is 16 bit. The instrument was successfully applied to measure ambient NO2 in sub-urban Tokyo. Comparison with a commercial NOx box demonstrates the capability of this instrument.

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