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The multiple-mirror lidar `9-eyes'

F Congeduti-+, F Marenco-+, P Baldetti++ and E Vincenti-+

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The Institute of Atmospheric Physics is developing a large lidar system for atmospheric remote sensing. It will be installed in two containers, to facilitate its deployment at different locations for measurement runs. The emitted wavelengths are 532 and 355 nm, and are obtained with a Nd:YAG laser. The receiver includes three light collectors to split the large dynamic range of the signal incident on each photodetector. The major receiver, to be used for the observation of the middle atmosphere, is an array of nine 0.5 m diameter telescopes (hence the name `9-eyes'). The advantage of the multiple-mirror technique, with respect to a single-mirror receiver, is mainly in the reduced volume, for the same receiving surface (and hence lower cost and transportability). Moreover, the system architecture allows for flexibility in the use of different observation geometries. The other two light collectors are smaller single telescopes, and will be used for the observation of the lower layers of the atmosphere (troposphere and lower stratosphere). Vertical profiles extending from the boundary layer to the mesopause are expected from this instrument, corresponding to a luminous signal spanning over 13 orders of magnitude. Detection of elastic backscattering yields the aerosol profile and information on clouds (base height, optical and geometrical depth of thin clouds). It also provides the molecular density and temperature above km. In the final configuration, the system will also be equipped for the detection of the Raman-scattered signal from and O, to supply the corresponding vertical distributions.


PACS

42.68.Wt Remote sensing; LIDAR and adaptive systems

42.15.Eq Optical system design

42.79.Bh Lenses, prisms and mirrors

85.60.Gz Photodetectors (including infrared and CCD detectors)

42.79.Qx Range finders, remote sensing devices; laser Doppler velocimeters, SAR, and LIDAR

92.60.hv Pressure, density, and temperature

95.55.-n Astronomical and space-research instrumentation

92.60.Fm Boundary layer structure and processes

42.68.Kh Effects of air pollution

92.60.H- Atmospheric composition, structure, and properties

42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy

Subjects

Electronics and devices

Instrumentation and measurement

Optics, quantum optics and lasers

Environmental and Earth science

Astrophysics and astroparticles

Dates

Issue 2 (March 1999)

Received 3 July 1998, in final form 17 November 1998



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