311 近赤外レーザー吸収分光法による大気中の二酸化炭素安定炭素同位体比連続計測装置の開発(排ガス処理/省エネルギー技術)

概要

論文の詳細を見る
A near-IR laser based spectrometer for continuous measurement of stable carbon isotopes in CO_2 has been developed. ^<12>CO_2 and ^<13>CO_2 are detected with wavelength modulation spectroscopy and a Herriott-type multi-pass cell with a optical path length of 29.9 m using a distributed feedback laser diode in the 2-μm wavelength region. To measure the isotope ratio precisely, the influence of pressure and temperature variation in d^<13>C was evaluated. The limit of detection for our system was 16 ± 1 ppbv. The precision in the determination of δ^<13>C was 0.1 ‰ for 120 seconds signal integration time at ambient concentration levels. We demonstrate that our system enables automated continuous measurements of δ^<13>C of CO_2 in ambient air without any complex operation by users.
一般社団法人日本機械学会の論文
2011-06-29