U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

A comparison of heterodyne and direct detection C0₂ DIAL systems for ground-based humidity profiling



Select the Download button to view the document
Please click the download button to view the document.

Details

  • Personal Author:
    Hardesty, R. M.
  • Corporate Authors:
    Wave Propagation Laboratory
  • NOAA Program & Office:
    OAR (Oceanic and Atmospheric Research)
  • Description:
    A computer simulation developed to compare heterodyne and direct detection DIAL performance for ground-based water vapor profiling includes atmospheric models for turbulence, winds, wind shear, backscatter distribution, humidity and temperature and pressure uncertainties. Qualitative and quantitative causes of measurement error in differential absorption lidar systems are examined. Equations developed illustrate the relative sensitivity of the heterodyne system to speckle and turbulence. Heterodyne performance in a high signal-to-noise ratio regime was found to. improve if transmit pulse duration was decreased. Both coherent and incoherent systems are degraded by insufficient knowledge of atmospheric properties such as temperature. For the parameters

    considered, direct detection systems produce better measurements near the ground, whereas heterodyne measurements are better above 3 km.

  • Keywords:
  • Series:
    NOAA technical memorandum ERL WPL   64
  • Document Type:
    Technical Memorandum
  • License:
  • Rights Information:
    CC0 Public Domain
  • Compliance:
    Library
  • Main Document Checksum:
    urn:sha256:0547b116cfadad9f0c77f7431476042b71552e731cb99cb8ca604f8038d0db37
  • Download URL:
  • File Type:
    Filetype[PDF - 137.72 MB ]
PREVIOUS
ON THIS PAGE
Details
The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP