Physics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977japme..16.1072b&link_type=abstract
Journal of Applied Meteorology, vol. 16, Oct. 1977, p. 1072-1076.
Physics
Atmospheric Moisture, Electromagnetic Absorption, Laser Outputs, Water Vapor, Absorption Spectra, Laboratory Equipment, Line Spectra, Moisture Content, Time Response
Scientific paper
A sensitive laser method with fast response time has been developed which is suitable for measuring atmospheric water vapor concentration. The method utilizes the absorption of 33.02 and 27.972 micron radiation from a water vapor laser. Experiments were carried out in a 2 m controlled atmosphere absorption cell at conditions corresponding to ground-level to high-altitude atmospheric pressures. Typically, an absorption of 1% was produced in a 1 m path length by a water vapor pressure of 1.1 Pa at ground level and 2.2 Pa at 5 km using 33.02 micron laser radiation. With 27.972 micron laser radiation the absorption is about a factor 50 less and can be used when higher concentrations of water vapor are encountered. The response time of the detecting apparatus can be less than a second and still achieve these sensitivities. Possibilities of building an airborne instrument for measuring water vapor concentration are discussed.
Brannen E.
Kucerovsky Z.
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