The Use of CO and CO2 Lasers to Detect Pollutants in the Atmosphere
Abstract
Several spectral coincidences between CO laser emission lines and infrared absorption lines of oxides of nitrogen have recently been observed. Using existing infrared spectroscopy data, we predict additional spectral coincidences; the Q-switched CO laser emits certain lines which overlap SO2 absorption lines, and certain frequency doubled CO2 laser lines overlap NO and CO absorption lines. Other spectral overlaps involving the CO2 laser have been reported elsewhere. Based on such coincidences remote sensing of these atmospheric constituents can be accomplished by observing resonant absorption, thermal emission, or fluorescence. The authors discuss sensitivities for each of these methods, using data on line strengths and pressure broadened line widths. Wide band heterodyne receivers offer high sensitivity when they can be used; our discussion included the use of this type of receiver system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1970
- Accession Number
- AD0717171
Entities
People
- Robert T. Menzies
Organizations
- California Institute of Technology