Ascension laserBIRD, Installation And Operation Manual

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laserBIRD™ Installation and Operation Guide
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Note: Due
to decreasing laser
beam intensity as
the Sensor moves
off Scanner center
(default X axis) ,
angular range will
fall off (up to
~40%) as the
sensor approaches
the edges of the
operating region.
Sensor
The laserBIRD sensor incorporates three detectors. These detectors are custom
photodiodes that produce an event pulse when energized by the scanning laser beam. The
detectors also contain a color glass filter over the active optical area of the diode.
Embedded in the epoxy of the detector package, this filter mitigates the effects of
extremely high ambient conditions.
The event waveforms produced from each detector, are amplified and sent to the Scanner
for processing. The calculated positions of the three detectors help to define a plane that is
used to determine sensor orientation. For this reason the sensor must maintain a clear line
of sight between all detectors and the scanner, and the detectors must not exceed an
orientation range of ±85° with respect to the Scanner.
Operating Region
The effective operating region (valid sensor tracking) for the laserBIRD is shown below.
Note that the field of view diagrams depict a conical-like motion region, which begins ~6
inches in the +X direction from the Scanner origin. Therefore, sensor motion closer to the
Scanner than 6 inches, will not be detected.
Angular range is best defined as a range of angular motion in the horizontal and vertical
directions, beginning along an axis that connects the Scanner to the Sensor. This range of
motion is ±85 degrees in both vertical and horizontal directions, when the Sensor is
directly in front of the Scanner in the center of the Performance Motion Box (see below).
Due to decreasing laser beam intensity as the Sensor moves off Scanner center (default X
axis) , angular range will fall off (up to ~40%) as the sensor approaches the edges of the
operating region. Users requiring maximum angular range should restrict motion to the
center of the Performance Motion Box.