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Instrument: VIL : Volume Imaging Lidar
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The Volume Imaging Lidar (VIL) is an elastic aerosol backscatter lidar
designed to image the four-dimensional structure of the atmosphere
[1]. Figure 1 shows a block diagram of the system. The transmitter
employs a pulsed Nd:YAG laser. The receiver consists of a telescope,
interference filter, and avalanche photo diode. Scanning is performed
using a fast, computer controlled beam steering unit consisting of two
flat rotating mirrors mounted at 45 angles on the optical axis of the
transmitter-receiver system. Realtime control and data acquisition are
controlled by an Intel i960 microcontroller on VME bus. An interactive
user interface and graphical real time displays are perfomed using
Silicon Graphics Indigo II workstation. The system is mounted in a
semi-trailer, that has a water chiller and air conditioning to provide
an adequate environment for the lidar and electronics. Only an
external AC-power source is required for a full field operation.

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[Summary provided by Computer Based Learning Unit, University of Leeds]