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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 30 — Oct. 20, 2001
  • pp: 5280–5294

High-Spectral-Resolution Lidar with Iodine-Vapor Filters: Measurement of Atmospheric-State and Aerosol Profiles

John W. Hair, Loren M. Caldwell, David A. Krueger, and Chiao-Yao She  »View Author Affiliations


Applied Optics, Vol. 40, Issue 30, pp. 5280-5294 (2001)
http://dx.doi.org/10.1364/AO.40.005280


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Abstract

A high-spectral-resolution lidar can measure vertical profiles of atmospheric temperature, pressure, the aerosol backscatter ratio, and the aerosol extinction coefficient simultaneously. We describe a system with these characteristics. The transmitter is a narrow-band (FWHM of the order of 74 MHz), injection-seeded, pulsed, double YAG laser at 532 nm. Iodine-vapor filters in the detection system spectrally separate the molecular and aerosol scattering and greatly reduce the latter (−41 dB). Operating at a selected frequency to take advantage of two neighboring lines in vapor filters, one can obtain a sensitivity of the measured signal-to-air temperature ratio equal to 0.42%/K. Using a relatively modest size transmitter and receiver system (laser power times telescope aperture equals 0.19 Wm<sup>2</sup>), our measured temperature profiles (0.5–15 km) over 11 nights are in agreement with balloon soundings to within 2.0 K over an altitude range of 2–5 km. There is good agreement in the lapse rates, tropopause altitudes, and inversions. In principle, to invert the signal requires a known density at one altitude, but in practice it is convenient to also use a known temperature at that altitude. This is a scalable system for high spatial resolution of vertical temperature profiles in the troposphere and lower stratosphere, even in the presence of aerosols.

© 2001 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(010.3640) Atmospheric and oceanic optics : Lidar
(280.1100) Remote sensing and sensors : Aerosol detection
(280.3640) Remote sensing and sensors : Lidar

Citation
John W. Hair, Loren M. Caldwell, David A. Krueger, and Chiao-Yao She, "High-Spectral-Resolution Lidar with Iodine-Vapor Filters: Measurement of Atmospheric-State and Aerosol Profiles," Appl. Opt. 40, 5280-5294 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-30-5280

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