21
panel. This is designed to provide a more stable response in crop mode.
The tradeoff is that the system will also be slightly slower to respond in
crop mode than in soil mode.
Thin Crop
Ultrasonic sensors operate by bouncing sound waves off of the desired
target. A minimum signal level is required from the crop in order to use it
for control purposes. This is no different than the fact that your radio must
be at a certain minimum volume level before you can physically hear it.
Different types of crop, and crops at different stages of development return
varying levels of sound. The following are some general guidelines.
•
Crops in growing stages are relatively good sonic targets.
•
Bearded crops are relatively poor sonic targets.
•
In row crops the sensor must be positioned over the row to use the
crop signal or between the rows to use the ground signal.
•
The desired target must cover roughly 60 percent of the area to be
tracked consistently. That is, when looking at the ground, the
heads should cover about 60 percent of the ground. Otherwise,
you can use SOIL mode.
•
If the sensor runs too close to the heads, they may not return
enough signal to be seen, or they may be blanked out. The nozzles
must be at least 22 inches from the crop. Slightly higher target
height settings will work better in thin crop
Содержание UC4 Total Control
Страница 36: ...34 ...
Страница 58: ...NOTES ...