High-sensitivity detection of CH radicals in flames by use of a diode-laser-based near-ultraviolet light source

被引：24

作者：

Peterson, KA ^{[1
]}

Oh, DB ^{[1
]}

机构：

[1] SW Sci Inc, Santa Fe, NM 87505 USA

来源：

OPTICS LETTERS | 1999年 / 24卷 / 10期

关键词：

D O I：

10.1364/OL.24.000667

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

CH radical distributions in ethylene-air and methane-air diffusion flames are mapped by wavelength-modulation absorption spectroscopy (WMS). Tunable, wavelength-modulated 426-nm light is generated by frequency doubling of a modulated 852-nm distributed Bragg reflector diode laser. Absorbances of 5 x 10(-5) are measured with second-harmonic (2f) WMS with a signal-to-noise ratio of 3:1 in a 3-Hz measurement bandwidth. The feasibility of simultaneous line-of-sight absorption and spatially resolved laser-induced-fluorescence detection with a single excitation beam is also demonstrated. This near-UV source is suitable for microgravity drop-tower experiments and other applications in which compact, rugged, energy-efficient instrumentation is required. (C) 1999 Optical Society of America OCIS codes: 120.1740, 190.2620, 140.2020, 300.6380, 120.1880.

引用

页码：667 / 669

页数：3

共 13 条

[1] DIGITAL IMAGING OF REACTION ZONES IN HYDROCARBON AIR FLAMES USING PLANAR LASER-INDUCED FLUORESCENCE OF CH AND C-2 [J].