Ambient Hydrocarbon Detection with an Ultra-Low-Loss Cavity Raman Analyzer

被引：6
|
作者：
Singh, J. [1 ]
Muller, A. [1 ]
机构：
[1] Univ S Florida, Phys Dept, Tampa, FL 33620 USA
来源：
ANALYTICAL CHEMISTRY | 2023年
基金：
美国国家科学基金会;
关键词：
CROSS-SECTIONS; GAS; SPECTROSCOPY; HYDROGEN; BREATH; SPECTRA; SPECTROMETER; SCATTERING; DIAGNOSIS; ETHANE;
D O I：
10.1021/acs.analchem.2c04707
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The detection of ambient outdoor trace hydrocarbons was investigated with a multipass Raman analyzer. It relies on a multimode blue laser diode receiving optical feedback from a retroreflecting multipass optical cavity, effectively creating an external cavity diode laser within which spontaneous Raman scattering enhancement occurs. When implemented with ultra-low-loss mirrors, a more than 20-fold increase in signal-to-background ratio was obtained, enabling proximity detection of trace motor vehicle exhaust gases such as H2, CO, NO, CH4, C2H2, C2H4, and C2H6. In a 10-min-long measurement at double atmospheric pressure, the limits of detection obtained were near or below 100 ppb for most analytes.
引用
收藏
页码：3703 / 3711
页数：9
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