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Optoacoustic measurements of water vapor absorption at selected CO laser wavelengths in the 5-micron regionMeasurements of water vapor absorption were taken with a resonant optoacoustical detector (cylindrical pyrex detector, two BaF2 windows fitted into end plates at slight tilt to suppress Fabry-Perot resonances), for lack of confidence in existing spectral tabular data for the 5-7 micron region, as line shapes in the wing regions of water vapor lines are difficult to characterize. The measurements are required for air pollution studies using a CO laser, to find the differential absorption at the wavelengths in question due to atmospheric constituents other than water vapor. The design and performance of the optoacoustical detector are presented. Effects of absorption by ambient NO are considered, and the fixed-frequency discretely tunable CO laser is found suitable for monitoring urban NO concentrations in a fairly dry climate, using the water vapor absorption data obtained in the study.
Document ID
19760058916
Document Type
Reprint (Version printed in journal)
Authors
Menzies, R. T. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shumate, M. S. (California Institute of Technology Jet Propulsion Laboratory Pasadena, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
September 1, 1976
Publication Information
Publication: Applied Optics
Volume: 15
Subject Category
LASERS AND MASERS
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other