Conditions Affecting the Laser Transmitter
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3-13
Atmospheric Laser Bending
Sometimes, atmospheric conditions can cause the laser beam to
bend as it gets farther away from the transmitter. The different
atmospheric layers in the air causes this bending, and most
frequently occurs in calm-air mornings and evenings in the
spring and fall when rapid changes in temperature and humidity
occur.
Since temperature and humidity changes also cause drift in
some lasers, detecting atmospheric bending as well as drift can
help reduce or eliminate grading problems.
Excluding laser drift, if the implement cuts (or fills) on all ends
of the field, the laser is bent due to atmospheric bend
(Figure 3-11).
Figure 3-11. Beam Bending Due to Atmospheric Conditions
Atmospheric beam bending can be an inconsistent, increasing
error the farther away from the transmitter. The beam bending
may be undetectable or minimal at 500’, and may bend down
.05’ or more at 1000’ from the laser.
without Atmospheric Drift
Beam Height
with Atmospheric Drift
Atmospheric Affects Cause the Beam to Bend
The Farther away From the Transmitter it Gets
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