Abstract

CARS spectra of NH₃ have been obtained from a commercial catalytic ammonia oxidation plant operating at ∼10 atmospheres (absolute) and 250°C. A purpose-designed ruggedized CARS spectrometer—incorporating a novel dye laser, remote control, and fiber optic signal transfer—is described. A new and simple technique for CARS concentration analysis using polarized beams gave a precision of 5.9% for NH₃ from single-shot spectra under laboratory conditions. Unfortunately, severe beam steering problems were encountered in the full-scale plant; this prevented a quantitative analysis of the spectra obtained. The origins of this problem together with suggestions for overcoming or reducing its effect are given.

Mode noise in broadband CARS spectroscopy

D. A. Greenhalgh and S. T. Whittley
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Multichannel light detectors and their use for CARS spectroscopy

D. R. Snelling, R. A. Sawchuk, and G. J. Smallwood
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Mobile CARS instrument for combustion and plasma diagnostics

Torger J. Anderson, Gregory M. Dobbs, and Alan C. Eckbreth
Appl. Opt. 25(22) 4076-4085 (1986)

N₂ and CO vibrational CARS and H₂ rotational CARS spectroscopy of CH₄/N₂O flames

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Appl. Opt. 22(22) 3604-3611 (1983)

Simultaneous temperature and sensitive two-species concentration measurements by single-shot CARS

Michel Pealat, P. Magre, P. Bouchardy, and G. Collin
Appl. Opt. 30(10) 1263-1273 (1991)