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A comparison of heterodyne and direct detection C0₂ DIAL systems for ground-based humidity profiling
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1980
[PDF-137.72 MB]
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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.
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Rights Information:CC0 Public Domain
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