Geophysics

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 able to tracking cloud base and delicate to boundary layer aerosols is brought. the most important 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 advantageous sensitivity within the near-range of the device is accomplished with out compromising signal-to-noise in a layout that's easy to fabricate for large deployment. The tool, its optical characterization, and its functionality within the box are defined. The prototype device defined right here has considering shaped the foundation of a advertisement sensor for tracking clouds and aerosols.

High-resolution, non-stop observations of clouds and aerosols are had to decrease the big uncertainties in our present knowing in their impression on weather which were highlighted by means of the overseas Panel on weather switch. And as overseas health and wellbeing enterprises point out transforming into public future health threats over the arrival a long time because of negative air caliber, wide aerosol tracking is needed to evaluate own publicity to and the wellbeing and fitness affects of anthropogenic particulates. Ground-based optical distant sensing measurements made through well-characterized tools, resembling that defined in those pages, are severe to this.

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Extra info for A Novel Lidar Ceilometer: Design, Implementation and Characterisation

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13) This expression can be useful for applying assumptions to the lidar ratio over the detection range if, for example, p (r) is assumed to be constant or a linear function, or if it can be calculated using a model or measured by some method. 14) where B0 and k are assumed to be constants. This power law expression was used in differential form in Klett’s original derivation of the backward inversion method. 0. The lidar ratio is a fundamental unknown for most elastic lidar measurements. The quality of elastic lidar inversion often depends on the accuracy of the assumptions made regarding the lidar ratio.

I. Stachlewska, M. Piadłowski, S. Migacz, A. Szkop, A. Zieli´nska, P. Swaczyna, Ceilometer observations of the boundary layer over Warsaw, Poland. Acta Geophys. 60, 1386–1412 (2012). 1 Introduction This chapter introduces the subject of light scattering by molecules and water droplets in the atmosphere and gives an overview of the theory essential for interpreting elastic lidar returns from clouds and aerosols. First, parameters describing droplet size distributions in clouds are explained. Following this, scattering, extinction, and the relationship between the two are considered.

Finally, 30 α(r )=10km−1 b 25 −1 α(r )=5km b α(r )=15km−1 α (km−1) 20 b 15 10 5 0 0 20 40 60 80 100 120 140 160 180 200 220 Range Past Full Overlap (m) Fig. 5 α (km−1) 20 15 10 5 0 20 40 60 80 100 120 140 160 180 200 220 Range Past Full Overlap (m) Fig. 6 Influence of lidar ratio exponent k on backward inversion as originally calculated by Klett [18] since range-corrected signals are typically noisy at far ranges, the influence of this noise on inversion also needs to be considered. A thorough examination of error sensitivity of the backward inversion technique has been given by Rocadenbosch and Comerón [22].

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