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

Kristen A. Peterson | Zendy; Daniel B. Oh | Zendy

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

Author(s) -

Kristen A. Peterson,

Daniel B. Oh

Publication year - 1999

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.24.000667

Subject(s) - tunable diode laser absorption spectroscopy , laser , optics , materials science , wavelength , ultraviolet , tunable laser , absorption spectroscopy , optoelectronics , diode , spectroscopy , spectrometer , physics , quantum mechanics

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.

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