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100
1 -7 represent
sensitivity levels
90
80
70
60
50
40
30
20
10
0
0
Sensitivity Levels
There are seven sensitivity levels; with each increasing level number, the ability of the system to
tolerate background IR light increases. Increasing the sensitivity level makes the system
performance more robust in the presence of background IR light; however, it increases the chance
that a tool cannot be tracked properly because it may have a marker that is not bright enough. Low
marker brightness can be caused by, for example, the surface of a marker becoming partially
occluded by fluids or other materials, thus reducing the reflectivity of the marker.
Level 4 is the default sensitivity level for the Polaris Vicra System and should work well in most
situations.
7.2
Changing the Sensitivity Level
Checking for Background IR Light
If a tool is tracking intermittently or not tracking at all, check the IR interference flag in the port
status and in the tool information returned with the BX or TX command. If the IR interference flag
is intermittently or constantly on for any of the tools, there may be background IR present.
Alternatively, you can check for the "Interference" flag in the tool tracking utility of NDI ToolBox,
or use the image capture utility in NDI ToolBox to capture images of the IR detected by the system.
Polaris Vicra User Guide - Revision 2
100
200
300
400
500
Integration Time (µs)
Figure 7-1 Infrared Light Sensitivity Levels
7
600
700
800
900
1000 1100 1200 1300 1400 1500
Setting the Infrared Light Sensitivity
6
5
4
3
2
1
55
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