Laboratory measurements of atmospheric water vapor and aerosol absorption at 1.064 um

Daniel J. Golich; Michael M. Malley

doi:10.1117/12.170656

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10 March 1994 Laboratory measurements of atmospheric water vapor and aerosol absorption at 1.064 um

Daniel J. Golich, Michael M. Malley

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Proceedings Volume 2068, Chemical, Biochemical, and Environmental Fiber Sensors V; (1994) https://doi.org/10.1117/12.170656
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

We report the use of a windowless resonant spectrophone to make highly sensitive (10^-9 cm^-1) photoacoustic measurements of atmospheric water vapor and aerosol absorption. A tunable high-resolution cw Nd:YAG laser was used to measure the water vapor lines and aerosol absorption spectrum at 1.064 mm. The water vapor absorption lines were used to calibrate the spectrophone for the aerosol measurements. The spectrophone was also calibrated using the theoretical expression with an independent measurement of the Q of the spectrophone. The initial windowless spectrophone has the ability to make in situ real- time measurements of atmospheric absorption to an accuracy sufficient for thermal blooming calculations. The ability of the spectrophone to detect at the 40-parts-per-trillion-level of other gaseous and volatile species is discussed. The use of resonant mufflers to isolate the spectrophone from external noise is also presented.

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Daniel J. Golich and Michael M. Malley "Laboratory measurements of atmospheric water vapor and aerosol absorption at 1.064 um", Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); https://doi.org/10.1117/12.170656

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