A compact broadband cavity enhanced absorption spectrometer for detection of atmospheric NO2 using light emitting diodes

被引：90

作者：

Langridge, Justin M.

Ball, Stephen M.

Jones, Roderic L.

机构：

[1] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England

[2] Univ Cambridge, Dept Chem, Univ Chem Lab, Cambridge CB2 1EW, England

来源：

ANALYST | 2006年 / 131卷 / 08期

基金：

英国自然环境研究理事会;

关键词：

D O I：

10.1039/b605636a

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A compact and low power detector has been developed for the in situ measurement of atmospheric NO2 using broadband cavity enhanced absorption spectroscopy. Absorption by the O-2 - O-2 collisional pair was used to determine the cavity mirror reflectivity, thus enabling the retrieval of absolute absorber concentrations by differential spectral fitting techniques. Quantitative amounts of ambient NO2 ( between 3 and 32 parts per billion) were retrieved from spectra recorded in the presence of ambient aerosol with statistical uncertainties approaching 100 ppt for a 60 s averaging period. The instrument's response was compared to that of a commercial chemiluminescence detector and was found to agree to within 6%.

引用

页码：916 / 922

页数：7

共 34 条

[1] Solving chemical problems of environmental importance using cavity ring-down spectroscopy [J].