, Volume 67, Issue 3, pp 283-288

Diode-laser absorption measurements of CO2, H2O, N2O, and NH3 near 2.0 μm

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, H2O, N2O, and NH3 concentrations in various flowfields using absorption spectroscopy and extractive sampling techniques. An external-cavity diode laser with a tuning range of 1.953–2.057 μm was used to record absorption lineshapes from measured transitions in the CO22 03, ν1+2ν2 03, and 2ν13 bands, H2O ν23and ν12 bands, N2O 2ν1+4ν2 0, ν2 1+2ν3, 3ν1+2ν2 0, and 4ν1 bands, and NH3ν14 and ν34 bands. Measured CO2, H2O, and N2O survey spectra were compared to calculations to verify the HITRAN96 database and used to determine optimum transitions for species detection. Individual lineshape measurements were used to determine fundamental spectroscopic parameters including the line strength, line-center frequency, and self-broadening coefficient of the probed transition. The results represent the first measurements of CO2, H2O, N2O, and NH3 absorption near 2.0 μm using room-temperature near-IR diode lasers.

Received: 12 March 1998/Revised version: 7 May 1998