VCSEL based detection of water vapor near 940nm.
A vertical-cavity surface-emitting laser (VCSEL) was used to study the absorption spectrum of water vapor in the 940nm region. Measurements were performed in ambient air at room temperature and in a hydrogen-oxygen flame over the temperature range of 1500-1800K. Several rotational absorption lines within the 2v1 + v3 vibrational band were measured. The absorption spectra were well resolved, which demonstrates the feasibility of VCSEL-based spectroscopic measurements of water vapor at room and high-temperature in this spectral region. The results were in good agreement with the values obtained from the HITRAN-96 database.
Cattaneo
Heidi
H
Optics Laboratory, Institute of Physics, Tampere University of Technology, P.O. Box 692, FIN-33101 Tampere, Finland. heidi.cattaneo@tut.fi
Laurila
Toni
T
Hernberg
Rolf
R
D003627:Data Interpretation, Statistical; D007834:Lasers; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods; D013696:Temperature; D014867:Water / Q000032:analysis*
D014867:Water