An optical water vapor sensor for unmanned aerial vehicles

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Description

The water vapor sensor developed by Aerodyne Research, based on the optical absorption of light at {approximately}935 nm, has been successfully demonstrated on board the Pacific Northwest National Laboratory's Gulfstream-1 research aircraft during the Department of Energy's ARM Intensive Operations Period in August 1998. Data taken during this field campaign show excellent agreement with a chilled mirror and Lyman-alpha hygrometers and measurements confirm the ability to measure rapid, absolute water vapor fluctuations with a high degree of instrument stability and accuracy, with a noise level as low 10 ppmv (1 Hz measurement bandwidth). The construction of this small, lightweight sensor ... continued below

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Medium: P; Size: 70 pages

Creation Information

Berkoff, Timothy A.; Kebabian, Paul L.; McClatchy, Robert A.; Kolb, Charles E. & Freedman, Andrew December 1, 1998.

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Description

The water vapor sensor developed by Aerodyne Research, based on the optical absorption of light at {approximately}935 nm, has been successfully demonstrated on board the Pacific Northwest National Laboratory's Gulfstream-1 research aircraft during the Department of Energy's ARM Intensive Operations Period in August 1998. Data taken during this field campaign show excellent agreement with a chilled mirror and Lyman-alpha hygrometers and measurements confirm the ability to measure rapid, absolute water vapor fluctuations with a high degree of instrument stability and accuracy, with a noise level as low 10 ppmv (1 Hz measurement bandwidth). The construction of this small, lightweight sensor contains several unique elements which result in several significant advantages when compared to other techniques. First, the low power consumption Argon discharge lamp provides an optical beam at a fixed wavelength without a need for temperature or precision current control. The multi-pass absorption cell developed for this instrument provides a compact, low cost method that can survive deployment in the field. Fiber-optic cables, which are used to convey to light between the absorption cell, light source, and detection modules enable remote placement of the absorption cell from the opto-electronics module. Finally, the sensor does not use any moving parts which removes a significant source of potential malfunction. The result is an instrument which maintained its calibration throughout the field measurement campaign, and was not affected by high vibration and large uncontrolled temperature excursions. We believe that the development of an accurate, fast response water vapor monitor described in this report will open up new avenues of aerial-vehicle-based atmospheric research which have been relatively unexplored due to the lack of suitable low-cost, light-weight instrumentation.

Physical Description

Medium: P; Size: 70 pages

Notes

OSTI as DE00762245

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  • Other Information: PBD: 1 Dec 1998

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  • Report No.: DOE/ER/81915
  • Grant Number: FG02-95ER81915
  • DOI: 10.2172/762245 | External Link
  • Office of Scientific & Technical Information Report Number: 762245
  • Archival Resource Key: ark:/67531/metadc717446

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 1, 1998

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • March 23, 2016, 10:56 a.m.

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Berkoff, Timothy A.; Kebabian, Paul L.; McClatchy, Robert A.; Kolb, Charles E. & Freedman, Andrew. An optical water vapor sensor for unmanned aerial vehicles, report, December 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc717446/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.