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.
GreenhalghD. A., in Advances in Infrared and Raman Spectroscopy, Advances in Non-Linear Spectroscopy, HesterR. E. and ClarkeR. J. H., Eds. (Wiley, London, 1988), Chap. 5, p. 193.
9.
HallR. J. and EckbrethA. C., Laser Applications, ReadyJ. F. and ErfR. K., Eds. (Academic Press, New York, 1984), Vol. 5.
10.
DruetS. A. J. and TaranJ.-P. E., Progress in Quantum Electronics7. 1 (1981).
11.
GreenhalghD. A. and EnglandW. A., AERE Harwell Report No. R10282 (1982).
12.
GreenhalghD. A., Raman Spectrosc.14, 150 (1983).
13.
EckbrethA. C., Appl. Opt.18, 3215 (1979).
14.
HammondP. R., Opt. Comm.29, 331 (1979).
15.
LevensonM. D. and SongJ. J., Phys. Rev. Lett.36, 189 (1976).
16.
FarrowR. L.LuchtR. P.ClarkG. L., and PalmerR. E., Appl. Opt.24, 2241 (1985).
17.
EnglandW. A.MilneJ. M.JennyS. N., and GreenhalghD. A., Appl. Spectrosc.38, 867 (1984).
