Sensitive detection of ammonia absorption by using a 1.65 MU-M distributed feedback InGaAsP diode laser

Year: 1995

Authors: Cancio P., Corsi C., Pavone F.S., Martinelli R.U., Menna R.J.

Autors Affiliation: European Laboratory for Non-linear Spectroscopy (LENS), Lgo. E. Fermi 2, I-50125 Firenze, Italy; David Sarnoff Research Center, CN 5300, Princeton, NJ 08543-5300, USA

Abstract: We have developed a 1.65 mu m DFB diode laser absorption spectrometer to allow high sensitive detection of ammonia at this wavelength. The study was done over 1.66454 mu m (6007.6cm(-1)) component of v(2) + v(3) + v(4) re-vibrational combination band of NH,. An apparatus sensitivity limit of 2ppm-m of pure NH3 was measured by using a phase-sensitive low-wavelength-modulation (LWM) detection technique. Minimum detectable concentrations of 55 ppm-m of NH3 in N-2, and 59 ppm-m of NH3 in O-2 at a total pressure of 76 Torr and a temperature of 295 K were measured. Also, we have measured the unknown selfbroadening and foreign gas broadening coefficients for N-2 and O-2 for this line and their gas temperature dependence.

Journal/Review: INFRARED PHYSICS & TECHNOLOGY

Volume: 36 (6)      Pages from: 987  to: 993

KeyWords: Sensitivity molecular detection; Molecular laser spectroscopy;
DOI: 10.1016/1350-4495(95)00036-X

Citations: 15
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