Brickstream® 3D Gen 2 Version 6.2
6/25/2021
©2016-2021 FLIR Integrated
Imaging Solutions Inc.
All rights reserved.
Brickstream® 3D Gen 2 Installation Guide
June 2021
14
Selecting the Appropriate Lenses
Generally speaking, the higher the sensor is mounted, the more it can see. There are limits, though: at
some point the installation height becomes too high making people appear too small in the sensor
view to be accurately tracked. This situation is resolved by using a lens with an increased focal length.
Follow these guidelines when selecting the appropriate lenses:
n Choose the highest possible lens that gives you enough coverage area to observe the desired
behavior from the installation height.
n For a tilted sensor, lens height is not just the vertical mounting height but how far away tracked
objects are from the lens, as shown in the following example of oblique coverage:
This obliquely-mounted 3D Gen 2 2.5 mm lens is
mounted 14feet high, which is within specifications for
that lens type. However, the individual we want to track
is almost 20feet away, far outside the 15-ft limit for the
lens. The individual in this example would not be
tracked accurately.
Oblique coverage can increase coverage substantially, but there are limitations:
n Generally a tilt of 5° to 10° does not impact accuracy.
n Greater than 10° tilts impact accuracy, especially in high-volume environments where occlusion
is constantly present.
Note: When tilting the sensor, the maximum tolerated
installation height is reduced in correlation with the degree of
tilt.
The mounting height determines the type of lens needed. Lens type as a function of mounting height
determines coverage. Use the following tables to gauge the installation height ranges for the lenses
available for the 3D Gen 2 sensor:
Lens Size Min. Height Max. Height
2.5 mm 2.2 m / 7.2 ft 7.0 m / 23.0 ft
6.0 mm 6 m / 19.7 ft 14 m / 45.9 ft
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