Development of dual-laser cavity ring-down spectroscopy for measurement of trace moisture in gases

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06127
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Measurement engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Abe Hisashi 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 上級主任研究員 (20356372)
• Co-Investigator(Kenkyū-buntansha): 橋口 幸治 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 研究員 (00712506) ; 天野 みなみ 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 主任研究員 (80586321)
• Research Collaborator: Lisak Daniel ニコラウス-コペルニクス大学, 准教授
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 高感度 / 高精度 / 微量水分

Outline of Final Research Achievements

We developed a dual-diode laser system in cavity ring-down spectroscopy (dual-laser CRDS) for accurate and high sensitivity measurement of trace-moisture in gases. The effectiveness of dual-laser CRDS for measurements of trace moisture was demonstrated by experiments based on an SI-traceable primary trace-moisture standard in the range of 8 nmol/mol to 630 nmol/mol. All the relative differences observed between the readings of dual-laser CRDS and trace-moisture standard values in the range of 8 nmol/mol to 630 nmol/mol (mole fraction) were within 4.2 % and smaller than the expanded uncertainties (a coverage factor of k=2), showing the high accuracy of dual-laser CRDS even in the range of 10 nmol/mol or less.

Free Research Field

湿度標準