Atmospheric pressure monitoring of trace gases using tunable diode lasers
- 1 April 1982
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 21 (7) , 1185-1190
- https://doi.org/10.1364/ao.21.001185
Abstract
High-sensitivity measurements of infrared absorptions due to isolated lines broadened by air at atmospheric pressure are reported. Tunable diode lasers and harmonic techniques were employed to detect absorptions as small as 0.01% over path lengths up to 250 m through the open air. The limiting noise source is caused by a base line signal which varies with the optical alignment. The reported sensitivity is not a fundamental limit. Techniques for further increasing sensitivity are discussed.Keywords
This publication has 11 references indexed in Scilit:
- Second-harmonic detection with tunable diode lasers ? Comparison of experiment and theoryApplied Physics B Laser and Optics, 1981
- Temporal correlation measurements of pulsed dual CO_2 lidar returnsOptics Letters, 1981
- AFGL atmospheric absorption line parameters compilation: 1980 versionApplied Optics, 1981
- Sensitivity limits of a tunable diode laser spectrometer, with application to the detection of NO_2 at the 100-ppt levelApplied Optics, 1980
- Optical feedback effects on the performance of Pb_1−xSnxSe semiconductor lasersApplied Optics, 1979
- Improved sensitivity of tunable-diode-laser open-path trace gas monitoring systemsApplied Optics, 1979
- Long-path laser monitor of carbon monoxide: system improvementsApplied Optics, 1979
- High sensitivity point monitoring of atmospheric gases employing tunable diode lasersApplied Optics, 1978
- Long-Path Monitoring of Atmospheric Carbon Monoxide with a Tunable Diode Laser SystemApplied Optics, 1975
- Analytical Line Shapes for Lorentzian Signals Broadened by ModulationJournal of Applied Physics, 1965