Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes

被引:36
作者
Denzer, W. [1 ,2 ]
Hancock, G. [1 ]
Islam, M. [3 ]
Langley, C. E. [1 ]
Peverall, R. [1 ,2 ]
Ritchie, G. A. D. [1 ]
Taylor, D. [1 ]
机构
[1] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
[2] Oxford Med Diagnost Ltd, Oxford OX5 1PF, England
[3] Univ Teesside, Sch Sci & Technol, Middlesbrough TS1 3BA, Cleveland, England
基金
英国工程与自然科学研究理事会;
关键词
FREQUENCY COMB SPECTROSCOPY; LIGHT-EMITTING-DIODES; SUPERCONTINUUM RADIATION; MASS-SPECTROMETRY; ACETONE; ISOPRENE; OVERTONE; ANALYZER; LASER;
D O I
10.1039/c0an00462f
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Cavity enhanced absorption measurements have been made of several species that absorb light between 1.5 and 1.7 mu m using both a supercontinuum source and superluminescent light emitting diodes. A system based upon an optical enhancement cavity of relatively high finesse, consisting of mirrors of reflectivity similar to 99.98%, and a Fourier transform spectrometer, is demonstrated. Spectra are recorded of isoprene, butadiene, acetone and methane, highlighting problems with spectral interference and unambiguous concentration determinations. Initial results are presented of acetone within a breath-like matrix indicating ppm precision at <similar to 10 ppm acetone levels. Instrument sensitivities are sufficiently enhanced to enable the detection of atmospheric levels of methane. Higher detection sensitivities are achieved using the supercontinuum source, with a minimum detectable absorption coefficient of similar to 4 x 10(-9) cm(-1) reported within a 4 min acquisition time. Finally, two superluminescent light emitting diodes are coupled together to increase the wavelength coverage, and measurements are made simultaneously on acetylene, CO2, and butadiene. The absorption cross-sections for acetone and isoprene have been measured with an instrumental resolution of 4 cm(-1) and are found to be 1.3 +/- 0.1 x 10(-21) cm(2) at a wavelength of 1671.9 nm and 3.6 +/- 0.2 x 10(-21) cm(2) at 1624.7 nm, respectively.
引用
收藏
页码:801 / 806
页数:6
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