A Novel Lidar Ceilometer: Design, Implementation and by Joshua D. Vande Hey

By Joshua D. Vande Hey

In this thesis, a brand new lidar (light detection and varying) ceilometer in a position to tracking cloud base and delicate to boundary layer aerosols is brought. the main 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, in addition to a mode for characterizing overlap within the laboratory. more desirable sensitivity within the near-range of the tool is completed with out compromising signal-to-noise in a layout that's common to fabricate for wide deployment. The software, its optical characterization, and its functionality within the box are defined. The prototype software defined the following has given that shaped the root 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 figuring out in their impression on weather which were highlighted by means of the foreign Panel on weather switch. And as overseas future health enterprises point out becoming public wellbeing and fitness threats over the arriving many years caused by negative air caliber, large 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 means of well-characterized tools, similar to that defined in those pages, are severe to this.

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Science 256(5061), 1311–1313 (1992) References 19 22. V. D. F. Harrison, P. R. Barkstrom, E. Ahmad, D. Hartmann, Cloud-radiative forcing and climate: results from the earth radiation budget experiment. Science 243(4887), 57–63 (1989) 23. K. Sassen, cirrus, a modern perspective, in Cirrus (Oxford University Press, New York, 2002), pp. 11–40 24. D. DelGenio, GCM simulations of cirrus for climate studies, in Cirrus (Oxford University Press, New York, 2002), pp. 310–326 25. H. Pruppacher, J. Klett, Microphysics of Clouds and Precipitation (Kluwer Academic Publishers, Dordrecht, 1997) 26.

After gradually replacing the searchlight-based rotating beam ceilometers of the past [57], commercial eye-safe lidar systems capable of measuring height of cloud base and reporting vertical visibility have become standard atmospheric measurement tools. Used widely for aviation and meteorology, these instruments typically transmit short, low power, near-infrared laser pulses at high repetition rates in order to adhere to eye-safety guidelines. A wavelength of 905 nm is commonly used for a number of reasons.

This means it can be very difficult to separate the constituents of the extinction coefficient. 3 Elastic Scattering and Transmission of Light in the Atmosphere 29 atmosphere and/or or by including information from external measurements, it is possible to draw some conclusions about the relationship between total extinction and backscatter, a relationship that is of key importance to lidar measurements. 4 The Lidar Ratio Interpreting the physical meaning of a measured lidar signal is an inverse problem.

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