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2.1.1 Laser head
The C-ALS probe incorporates the laser head, which contains the measuring laser module. The laser head is
constructed of lightweight aluminium.
The laser head is designed to enable full 360° coverage for all surveys. Servo-driven gear systems within the C-
ALS probe drive a pivot for both vertical and horizontal movement. Both drive systems incorporate a clutch
mechanism coupled with firmware control to minimise the risk of damage if the laser head becomes obstructed
during scanning operations.
The brake on the vertical motor is only engaged once power is connected to the probe. When power is removed
from the probe, each axis is able to rotate and will back-drive the gearing and motor. This is most noticeable in the
vertical motion, and the laser head may be seen to swing vertically as gravity pulls the laser head down on the
vertical pivot. This movement will not damage the probe drive system.
To run a full scan, the laser head requires at least 20 cm clearance from the vertical pivot, on all sides of the probe.
Note that the laser head around the camera may become hot when the C-ALS HD is powered ON with the LEDs
fully lit.
Laser head
Camera
Transmit and
Receive laser optics
Vertical pivot
Horizontal
pivot
LEDs
Figure 3 C-ALS HD Laser head and borehole camera
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