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Multiple‐pass‐enhanced Raman spectroscopy for long‐term monitoring of hydrogen isotopologues
Author(s) -
Wen Chengwei,
Huang Xin,
Wang Weiwei,
Shen Chunlei,
Li Hairong
Publication year - 2019
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5649
Subject(s) - isotopologue , raman spectroscopy , spectroscopy , detection limit , line (geometry) , sensitivity (control systems) , analytical chemistry (journal) , noise (video) , signal (programming language) , hydrogen , laser , materials science , optics , chemistry , physics , computer science , molecule , electronic engineering , geometry , mathematics , organic chemistry , chromatography , quantum mechanics , artificial intelligence , image (mathematics) , programming language , engineering
We report a variant of multiple‐pass Raman spectroscopy with enhanced sensitivity for engineering applications. A four‐mirror multiple pass cell is introduced and compared with the conventional two (concave)‐mirror configuration. With this system, gas samples in static cells are measured and monitored. The results show that the noise equivalent detection limit (3σ n ) close to 100 ppm for hydrogen isotopologues can be achieved within two seconds with a 1.5‐W red laser. The relative precision is characterized by long‐term measurement, and the results indicate high system stability. The signal‐to‐noise ratio (SNR) in different configurations are investigated, and results show that high (greater than nine) SNR gain is achieved in the configuration of 12 passes. This newly designed Raman system is highly stable and suitable for fast and precise in‐line monitoring of hydrogen isotopologue mixtures, as well as other (hazardous) gas samples.