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Sonic Tracker and SAS Setup
Working Window and Sonic Footprint
45
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
Figure 76: Sonic Tracker Scanning Outside of Stringline
If the Tracker sees an obstruction closer than the reference signal, such as a grade pin, the watch stops at an
even shorter time (Figure 77). The Tracker is out of the Working Window, and no On-Grade correction signals
are applied.
Figure 77: Obstructions within the Sonic Tracker’s Working Window
Sonic Tracker and Temperature Changes
Since temperature affects the speed of sound, the Tracker has a built in temperature sensor for applications
with gradual temperature changes such as on graders or dozers. I n paving applications you can get a more
dramatic and rapid change in air temperature. To compensate for these variations a temperature bail is
positioned below the tracker.
When the Sonic Tracker’s transducer emits a sound wave, the tracker records the time to the bail and continues
to listen for the grade reference. I f a temperature variation occurs, such as heat off a freshly paved mat, a
difference in time to the temperature bail is recorded. The correction for the speed of sound is then applied to
the grade reference signal, preventing a change in mat depth. The tracker corrects for temperature variations
with every sound wave, 39 times per second. Figure 78 illustrates this concept.
Figure 78: Working w ith Sonic Trackers and Temperature Changes
Son ic Tracke r II
On
Grade
STOPWATCH
Sonic Tracke r II
Sonic Tracker II Sonic Tracker II
STOPWATCH
Temperature Bail
Target Reference
On Grade
Target Reference
STOPWATCH
Temperature Bail
Heat Induced
Target Error
On Grade
Heat Induced
Target Error
Wind Blow n Heat
Off of
Freshly Paved mat
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