Abstract

High-resolution absorption measurements of the H2O line in the v1 + v3 band at 1.3928 µm were made in the temperature range of 296–1100 K by use of an InGaAsP distributed-feedback laser diode operating at 1.39 µm. Spectral line shift, line strength, and N2 broadening on the water-vapor line and their impact on the accuracy of optical-absorption-based gas sensing have been investigated. The results obtained were compared with values obtained from the HITRAN database and values reported in the literature, facilitating H2O sensing in a nonstandard temperature and pressure environment.

© 2003 Optical Society of America

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