By Joshua D. Vande Hey
In this thesis, a brand new lidar (light detection and varying) ceilometer able to tracking cloud base and delicate to boundary layer aerosols is brought. the major to this novelty lies in its divided-lens layout that addresses a classical lidar challenge of balancing transmitter-receiver overlap and signal-to-noise ratio, besides a mode for characterizing overlap within the laboratory. more desirable sensitivity within the near-range of the software is completed with no compromising signal-to-noise in a layout that's ordinary to fabricate for huge deployment. The tool, its optical characterization, and its functionality within the box are defined. The prototype tool defined the following has on account that shaped the foundation of a advertisement sensor for tracking clouds and aerosols.
High-resolution, non-stop observations of clouds and aerosols are had to lessen the big uncertainties in our present knowing in their effect on weather which were highlighted through the overseas Panel on weather swap. And as overseas well-being businesses point out growing to be public wellbeing and fitness threats over the arrival many years due to bad air caliber, broad aerosol tracking is needed to evaluate own publicity to and the well-being affects of anthropogenic particulates. Ground-based optical distant sensing measurements made by way of well-characterized tools, akin to that defined in those pages, are severe to this.
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Extra info for A Novel Lidar Ceilometer: Design, Implementation and Characterisation
However, multiple scattering, in which a photon interacts with more than one scatterer before being detected, must often be considered, particularly in systems with large fields of view. 1 Rayleigh Scattering Scattering by gas molecules in the atmosphere can be described by Rayleigh scattering. 325 kPa), and λ is the wavelength of the light. Rayleigh scattering is symmetric for forward scattered and backscattered light. 39 550 λ(nm) 4 × 10−8 cm−1 sr −1 . 7) The most significant factor in these expressions is the λ−4 wavelength dependence of the scattering intensity which means, for example, that ultraviolet light at 355 nm is scattered 81 times more strongly by the molecular atmosphere than near-infrared light at 1,064 nm.
R. Meteorol. Soc. 138(664), 649–663 (2012) 85. C. Münkel, S. Emeis, W. Müller, and K. Schäfer, Aerosol concentration measurements with a lidar ceilometer: results of a one year measuring campaign, in Remote Sensing of Clouds and the Atmosphere VIII, vol. 5235, ed. P. Schäfer, A. C. adn Richard H. Picard (2004) 86. B. Heese, H. Flentje, D. Althausen, A. Ansmann, S. Frey, Ceilometer lidar comparison: backscatter coefficient retrieval and signal-to-noise ratio determination. Atmos. Meas. Tech. 3(6), 1763–1770 (2010) 87.
25 km . A CT75k located at Chilbolton Observatory has been calibrated  and was used in this study as a reference for prototype measurements as described in Chap. 5. Vaisala’s current research ceilometer model is the CL51, which also utilises a single-lens design, has a range of 13 km for cloud detection and 15 km for backscatter profiling . 5 Jenoptik Another advanced ceilometer is offered by Jenoptik, GmbH, based in Germany. Their CHM 15 k family of instruments has a specified range of 5 m to 15 km and is designed to have good sensitivity to either aerosols and cirrus clouds depending upon the model.