Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
44
•
If you turn on Show Hyperbola from the Output Menu, you can perform hyperbola fitting to get a
better dielectric estimate.
o
Position the horizontal and
vertical cursor at the top of a
hyperbola.
o
With Show Hyperbola turned
on, select the Dielectric control
button and use the Control
Knob or arrow keys to change
the value. As the value changes,
the shape of the hyperbola on
the screen will update. Match
the blue hyperbola with the one
seen in the data to get a better
dielectric estimate.
Set Depth
This control button allows you to enter the
depth of a known target and automatically
adjust the Dielectric Constant. This option
is only available when Show Hyperbola is
turned off. This can either be done from
Setup or while data playback through the
Output control button.
1
Set Horizontal Cursor (H Cursor) to
Move, and the Set Depth button
appears. Position the H Cursor at the
top of the known target.
2
Press the Set Depth control button.
The depth value for the position of the
H Cursor appears above Set Depth.
3
Adjust the depth value using either the Control knob or arrow keys to match the known value. The
vertical scale will change as you adjust the depth value and once the known depth is saved the
Dielectric Constant is adjusted.
Output – Distance and Point Mode
This control button opens a menu with options for modifying the data display during playback.
Dielectric:
Adjust the Dielectric Constant during data collection from one (1) to eighty-one (81).
•
Changing the Dielectric Constant will change the vertical scale if it is displayed in depth based on
the Time Range selected during setup.
Hilbert Txfm:
A Hilbert Transform is used to display subtle properties of the subsurface. Reflector
amplitude and time are the primary types of information in GPR data used to make interpretations.
Another way of defining the data is by transforming it into magnitude. This information is sometimes
more sensitive to important subsurface (dielectric) changes in the amplitude or geometric information.
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