Radiodetection RD1500 - Air Waves

GPR Concepts
© Radiodetection 2016 35 RD1500 Operation Manual
Material
Soil Cal
Air
300
Ice
160
Dry Soil
140
Dry Rock
120
Soil
100
Wet Rock
100
Concrete
100
Pavement
100
Wet Soil
65
Water
33
7.5 Air Waves
Some hyperbolas are caused by air wave reflections from objects above ground, such as posts,
fences, overhead wires, and trees.
The following image displays how air wave reflections affect data:
An important part of understanding the data image is learning to recognize these unwanted "air"
targets and distinguish them from the targets in the ground. Good field notes are indispensable
for helping identify unwanted events on the data.
The best way to identify air reflections is the target hyperbola method. Hyperbolas from above
ground objects are wider than objects in the ground and will have a Soil Cal at, or close to, 300.
To learn more, see Soil Cal in Section 8.6.