How LIDAR works The Leosphere Windcube® takes a snapshot measurement of dust backscatter at preconfigured ‘gates’ along its line of sight. The spacing between the gates is programmable, structured to best measure and record dust activity across the total distance. Most often, gate spacing is set at 25 metres, but in many applications, may have smaller intervals. The scanning speed can be varied with lower scan speeds producing higher resolution images of a dust plume. The LIDAR configuration is easily modified allowing scanning scenarios to be selected to target specific areas. Beam scans the area to provide 2-3D spatial coverage Portion of scattered light is collected by the telescope 25m pulse transmitted at 100-500 times a second Pulse envelope (25m) Doppler shift of particles Wind speed & direction. Backscattered light Detect the presence of particles. NOTE: Diagram not to scale LEOSPHERE WINDCUBE® FEATURES Dimension 1.5 m 2 Weight Scanning type Scanning mode Scanning speed 250 kg Endless, full hemispherical scanning Continuous scan mode Up to 30°/s Range of azimuth angle 0 to 360° Range of elevation angle -15 to 195° Angular resolution 0.1° Pointing accuracy
DUST MONITORING STATIONS Fixed dust monitoring stations are deployed as part of the Integro LIDAR Network. These stations are used to record localised dust concentration levels and wind speed/wind direction data. Data from the monitors is used to convert the optical data recorded on the Windcube® and display it as a mass concentration in µg/m 3 . This calculation occurs every hour within the Airodis software, utilising a correlation algorithm developed by Acoem. METEOROLOGICAL DATA Measuring wind speed and wind direction is vital to the accurate determination of dust emission sources and lift-off points. The network has several sensors at varying heights to record both local and site-wide wind conditions. Ambient temperature and relative humidity are monitored at a central location on the site. This data is used to fine tune and check the LIDAR settings and allows the Windcube® to record data that will enable the interface to produce consistent high quality images. Additional instrumentation can be included within the meteorological network to calculate evapotranspiration. This information can be useful when trying to determine how much water leaves the stockpiles through evaporation. The Windcube® is mounted at a height that allows a clear line of sight over the scanning area. This ensures that the PPI and RHI scans are uninterrupted by physical structures or stockpiles. acoem.com.au/lidar | 9
"Very efficient. Competitive pricing. The reminders, I’m so busy in my job that it’s so great to have a reminder to do something. It really helps me.
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- Tim Cannon – Research and Development Manager; Pecan Engineering Pty Ltd