GSSI SIR 4000, Руководство пользователя

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Geophysical Survey Systems, Inc. SIR® 4000
Manual
MN72-433 Rev F 40
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 collecting
through the Output control button.
1
Collect a file over a target with a known
depth.
2
Back up so the vertical cursor is in line with
the target.
3
Set Horizontal Cursor (H Cursor) to Move,
and the Set Depth button appears. Position
the H Cursor at the top of the known target.
4
Press the Set Depth control button and the depth value for the position of the H Cursor appears above
Set Depth.
5
Adjust the depth value using either the Control knob or arrow keys to match the known value. The
vertical scale and Dielectric will change as you adjust the depth value.
Output - Distance Mode
This control button opens a menu with options for modifying the data display
during collection.
Dielectric:
You can adjust the Dielectric Constant during data collection from a value
of 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 frequency and phase (positive or negative changes in the scan trace). This
information is sometimes more sensitive to important subsurface (dielectric) changes
in the amplitude or geometric information.