GPR4 Concrete Scanner – User Manual
D-000002-000021
Earth Science Systems, LLC
February 29, 2019
Copyright © 2019 ESS, LLC. All rights reserved.
Page 22 of 28
6 Appendix
6.1 Digitizer Settings
The default settings for the digitizer are sufficient for nearly all surveys. Advanced users
may choose to change these settings (see Figure A1). To view or change the digitizer settings,
select (
File
,
Settings
).
1.
Trace Sample Rate
Select the desired number of traces per second. Using fewer traces
per second gives a higher signal to noise ratio and increased depth of investigation.
However fewer traces per second will result in fewer traces per foot (meter) at a given
traverse speed.
2.
Sample Rate
Select the sample rate used for each A-scan. Normally a sample rate of 8
GHz is used for antennas with center frequencies less than 1 GHz, and 16 GHz is used
for antennas with center frequencies greater than 1 GHz.
3.
Num Samples
Select the number of samples for each A-scan. A value of 512 samples
will work for most situations. Note that using a large number of samples (1024 or more)
may limit the
Trace Sample Rate
.
4.
Channel A/B Holdoff
The GPR digitizer has two channels: A and B. The holdoff time
can be adjusted independently for each channel. The B channel can only be adjusted in
4 ns increments relative to the A channel. Normally, users will not need to change these
values.
6.2 Software Installation
If the tablet computer has not yet been setup for use with the Concrete Scanner, proceed
as follows. The thumb drive that was distributed with the system will be needed.
1. The tablet computer must use the Windows 10 operating system. The following tablet
computers are approved.
a. Microsoft Surface Pro 4
b. Microsoft Surface Pro 6
Figure A1. Digitizer settings dialog.
