Absorption line shift with temperature and pressure: impact on laser-diode-based H2O sensing at 1.393 microm.
High-resolution absorption measurements of the H2O line in the v1 + v3 band at 1.3928 microm were made in the temperature range of 296-1100 K by use of an InGaAsP distributed-feedback laser diode operating at 1.39 microm. 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.
Phelan
Richard
R
Semiconductor Photonics Group, Physics Department, Trinity College, Dublin 2, Ireland. phelanr@tcd.ie
Lynch
Michael
M
Donegan
John F
JF
Weldon
Vincent
V