Harmonic Saturated Spectroscopy for Interference Rejection in Molecular Photoacoustic Infrared Detection.
Abstract
The application of harmonic saturated spectroscopy to molecular detection in the infrared regime was investigated. Experimental measurements using SF6 as a model gas were performed with a CO2 laser photoacoustic molecular-vapor detector operating in the 9 through 11 micrometer portion of the infrared regime. These experiments demonstrated the negligible loss of absolute sensitivity, the maintenance of a characteristic readily identifiable absorption profile, and the ability to scale with laser intensity under the proper conditions. Our work demonstrates the importance of a laser modulation waveform that is completely devoid of spatial asymmetrics for the realization of the full potential of this method.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 24, 1985
- Accession Number
- ADA157025
Entities
People
- C. M. Klimcak
- J. A. Gelbwachs
Organizations
- The Aerospace Corporation