Windows, Beam pattern, Distance left-right beam pattern – Banner R-GAGE QT50R-RH Retroreflective High Sensitivity User Manual
Page 5
Windows
The R-GAGE sensor can be placed behind a glass or a plastic window, but the configuration must be tested and the distance from the
sensor to the window must be determined and controlled prior to installation. There is typically a 20% signal reduction when the sensor is
placed behind a window.
Polycarbonate at 4mm thickness performs well in most situations, but the performance depends on filler materials. Thinner (1 to 3 mm)
windows have high reflection. The amount of reflection depends on the material, thickness, and distance from the sensor to the window.
Locate the sensor in a position of minimum reflection from the window, which will repeat every 6.1 mm of distance between the sensor
and the window. The positions of maximum reflection from the window repeat between the minimums, and decrease in effect until the
window is approximately 150 mm (5.9 in) away. Consult the factory for pre-tested window materials which can be used at any distance
without issue.
Additionally, the face of the window should be protected from flowing water and ice by use of a flow diverter or hood directly above the
window. Falling rain or snow in the air in front of the window, light water mist, or small beads on the face of the window are typically not
an issue. However, a thick, continuous surface of water or ice directly on the face of the window can be detected as a dielectric boundary.
Beam Pattern
Typical Beam Pattern (with BRTR-CC20E Radar Target, Radar
Cross Section = 50 m
2
)
Typical Beam Pattern (with 4 different targets) at highest sen-
sitivity level
Left-Right Beam Pattern
5 m
0
-5 m
-10 m
-15 m
10 m
15 m
5 m
0
10 m
15 m
20 m
25 m
30 m
2
3
4
5
1
6 7
8
Distance
Left-Right Beam Pattern
0
4 m
8 m
12 m
16 m
2 m
0
-2 m
-4 m
-6 m
-8 m
4 m
6 m
8 m
2
3
4
1
Distance
1–8: Indicates sensitivity level
1: Weak Object (Radar cross section = 0.25 m
2
)
2: Car (Radar cross section = 3 m
2
)
3: Large Truck (Radar cross section = 50 m
2
)
4: Passenger Train (Radar cross section = 300 m
2
)
NOTE: The effective beam pattern depends on the sensitivity level and target properties.
R-GAGE™ QT50RAF Sensor
P/N 135460_web
Rev. E
www.bannerengineering.com - tel: 763-544-3164
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