12 October 2006 905-nm biaxial lidar ceilometer prototype
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A 905-nm 5-kHz rep. rate diode-laser biaxial lidar ceilometer (cloud-height monitoring) prototype is presented. The prototype uses a low-cost Fresnel lens and a low-NEP avalanche photodiode (APD) opto-electronic receiver. The article presents the opto-mechanical engineering of both the system and main subsystems involved as well as the system energy link-budget. The reception subsystem is based on a low-cost Fresnel-lens telescope and collimating and focusing adjustable parts, which include a rectangular slit diaphragm to minimise background radiance. Equivalent focal length, background radiance rejection gain, confusion circle and imaged spot characteristics onto the photodiode surface are also formulated and discussed by means of a geometrical optics approach. The emission subsystem uses a beam expander to ensure eye-safety (maximum exposure levels) and ad-hoc mechanics to provide enough degrees of freedom for emission-reception overlap factor (OVF) adjustment. At this point, an overview of future alternative mechanical solutions for enhanced pointing accuracy and trade-offs among different laser diode-based solutions is presented. This part is complemented with OVF simulations of the prototype designed. Finally, preliminary test measurements at our premises in North Campus (UPC) are introduced as raw and rangecorrected processed signals.
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Eduard Gregorio, Eduard Gregorio, Francesc Rocadenbosch, Francesc Rocadenbosch, Adolfo Comerón, Adolfo Comerón, } "905-nm biaxial lidar ceilometer prototype", Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 63621L (12 October 2006); doi: 10.1117/12.690867; https://doi.org/10.1117/12.690867


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