GPR4 Concrete Scanner – User Manual
D-000002-000021
Earth Science Systems, LLC
February 29, 2019
Copyright © 2019 ESS, LLC. All rights reserved.
Page 12 of 28
1. Turn on the power to the sensor unit. The power switch should glow with a green light.
2. Boot up the tablet computer and log in. Enable mouse pointer using the mouse icon on
the task bar if desired.
3. Connect to the sensor unit via WiFi. On the task bar, press the WiFi network icon
,
then select the network connection for the Concrete Scanner. The name of the
connection will be the serial number of the scanner (e.g., GPR40123). It will take 30-60
seconds after the sensor box has been powered up for the network to appear on the
tablet. Select the network connection for the scanner and wait for it to connect.
Windows will ask if you would like to connect automatically. If you enable automatic
connection, then this step can be skipped for future surveys.
4. Start the data acquisition program by touching and holding the
EssGpr4LoggingApp
icon
on the desktop. The program will startup, connect to the scanner, and start updating
with data. Figure 4 shows the acquisition program screen. There is a status panel that
shows status messages, but in most cases the user can hide this panel so that the
plotting area is larger. The green light on the scanner’s power button will flash when it is
connected to the acquisition program on the tablet computer. Users can pan and zoom
the plots in the acquisition program. To pan, simply click on the plot and drag. To zoom,
click on the plot, press
z
, then click and drag to draw the zoom box. For an alternate
zoom method, click on the plot, the press
shift-up-arrow
,
shift-down-arrow
,
shift-left-
arrow
, or
shift-right-arrow
to zoom in the vertical or horizontal direction. The reset the
plot, click on it and then press
esc
.
5. The acquisition program has several views that can be selected by clicking on the
appropriate tab on the top of the screen:
Survey Grid
,
GPR4 Record
, and optionally
Documentation
. Each tab has its own toolbar with functions dedicated to that view.
6. The
GPR4 Record
tab has standard A-scan and B-scan plots that are customary for
most GPR systems. The plot parameters can be changed by pressing the
Plot
parameters
button
(see Figure 5). For most users, the default settings will be
sufficient. For those interested, the dialog functions are described below.
a.
Use automatic range gain
When this is selected the program automatically
increases gain with increasing range to compensate for signal attenuation with
range. The gain profile is automatically readjusted at the start of each line.
b.
Automatic zero time
Use this setting to move the first arrival to the beginning of
the plot.
c.
Antenna combination
For the Pavement Scanner, this should always be set to
TxA RxA
.
d.
Depth/Time units
Select the units for the vertical scale on the B-scan. The most
basic units are sample number (
Samples
). Sample number multiplied by the
digitizer sample period gives sample time (
Nanoseconds
). Sample time
multiplied by the medium velocity gives distance (
Centimeters
,
Inches
,
Meters
,
Feet
).
e.
Depth/Time range
Users can opt to display the full range, half range, quarter
range, or eighth range. Users may wish to display only a shallow portion of the
