Ammonia monitoring near 1.5 mu m with diode-laser absorption sensors

We investigated ammonia spectroscopy near 1.5 mum to select transitions app ropriate for trace ammonia detection in air-quality and combustion emission s-monitoring applications using diode lasers. Six ammonia features were sel ected for these trace-gas detection applications based on their transition strengths and isolation from interfering species. The strengths, positions, and lower-state energies for the lines in each of these features were meas ured and compared with values published in the literature. Ammonia slip was measured in the exhaust above an atmospheric pressure premixed ethylene-ai r burner to demonstrate the feasibility of the in situ diode-laser sensor. (C) 2001 Optical Society of America.