Broadband supercontinuum laser absorption spectrometer for multiparameter gas phase combustion diagnostics

被引：36

作者：

Blume, Niels Goeran ^{[1
]}

Wagner, Steven ^{[1
]}

机构：

[1] Tech Univ Darmstadt, High Temp Proc Diagnost Grp, D-64289 Darmstadt, Germany

来源：

OPTICS LETTERS | 2015年 / 40卷 / 13期

关键词：

DIFFUSION FLAMES; OPTICAL-FIBERS; TIME-DOMAIN; DIODE-LASER; SPECTROSCOPY; TEMPERATURE; DISPERSION; LAMINAR;

D O I：

10.1364/OL.40.003141

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the development and application of a broadband absorption spectrometer utilizing a pulsed supercontinuum laser light source and dispersion compensating fiber with a single-pass absorption path to obtain absolute methane mole fractions in a laminar nonpremixed CH4/air flame supported on a Wolfhard-Parker burner. The basic principle of supercontinuum broadband absorption spectroscopy (SCLAS) provides advantageous means of combustion diagnostics since the broad spectral coverage allows for use in high-pressure high-temperature environments. Furthermore, a previously validated tunable diode laser absorption spectroscopy fitting algorithm was applied to the recorded spectra and found to be applicable to SCLAS measurements as well, by comparison of fitted methane gas concentrations to reference measurements on the Wolfhard-Parker burner. The spectrometer reached spectral resolutions of up to 0.152 cm(-1), while providing a spectral coverage of over 110 cm(-1), with an absorption path length of only 41 mm. First measurements of absolute CH4 mole fractions showed the suitability of SCL-based spectroscopy for combustion diagnostics with short absorption path lengths in the nIR spectral region. Here, we achieved in-flame methane mole fraction resolutions of 3 % Vol. (1210 ppm.m) and optical resolutions of up to 1.1 x 10(-2). Based on this first validation, this method can now be extended to other species and combustion parameters such as temperature and pressure. (C) 2015 Optical Society of America

引用

页码：3141 / 3144

页数：4

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