High-resolution absorption measurements of the H<sub>2</sub>O line in the <i>v</i><sub>1</sub> + <i>v</i><sub>3</sub> 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 N<sub>2</sub> 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 H<sub>2</sub>O sensing in a nonstandard temperature and pressure environment.
© 2003 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
Richard Phelan, Michael Lynch, John F. Donegan, and Vincent Weldon, "Absorption Line Shift with Temperature and Pressure: Impact on Laser-Diode-Based H2O Sensing at 1.393 µm," Appl. Opt. 42, 4968-4974 (2003)