31 October 2005 Impact on lidar system parameters of polarization selection/tracking scheme to reduce daylight noise
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The impact and potential of a polarization selection technique to reduce sky background noise (BGN) for monostatic elastic backscatter lidar measurements is examined. Taking advantage of naturally occurring polarization patterns in scattered sky light, we devised a polarization discrimination technique in which both the lidar transmitter and receiver track and minimize detected sky background noise while maintaining maximum lidar signal throughput. Lidar elastic backscatter measurements, carried out continuously during daylight hours at 532 nm, with a vertically pointing lidar in an urban atmosphere, show that changes of a factor of 10 in detected sky background noise power can occur between different polarization orientations for large solar zenith angles. This translates to over a factor of three improvement in signal to noise ratios (SNR) over conventional un-polarized schemes, depending on inclination of the lidar axis and the solar angle, with potential corresponding improvements in lidar range for elastic backscatter schemes including Raman and DIAL. The experimental measurements show that the diurnal variations in improved signal to noise ratio, including the impact of relative humidity, are consistent with theoretical estimates employing Radiative Transfer (RT) and using an urban aerosol model based on adjacent and simultaneous CIMEL measurements.
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Y. Y. Hassebo, Y. Y. Hassebo, B. M. Gross, B. M. Gross, M. Oo, M. Oo, F. Moshary, F. Moshary, S. A. Ahmed, S. A. Ahmed, "Impact on lidar system parameters of polarization selection/tracking scheme to reduce daylight noise", Proc. SPIE 5984, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing, 598408 (31 October 2005); doi: 10.1117/12.627716; https://doi.org/10.1117/12.627716

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