GPR4 Concrete Scanner – User Manual
D-000002-000021
Earth Science Systems, LLC
February 29, 2019
Copyright © 2019 ESS, LLC. All rights reserved.
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accomplished by pressing the rocker switch on the radar unit
up
momentarily. The
button should appear activated to indicate that data are being recorded. Move the cart
along the survey line to conduct the survey.
10. Move the cart along the survey line until the scanner moves beyond the conduit of
interest. Roll the scanner backwards on the line until the scanner is positioned directly
over the conduit and mark the position on the concrete surface with a marker. While
recording data, a marked fiducial can be placed in the datafile by pressing the
icon.
11. If data recording was enabled, press the
Record data
button
to turn off recording
after the cart has traversed the entire survey line. The button should appear inactivated.
This action can also be accomplished by pressing the rocker switch on the radar unit
down
momentarily.
12. If no further surveys are to be conducted, power down the sensor and odometer.
Disassemble the survey cart and return all components to the shipping case.
4.3 Conduct a 3D Survey
Users usually conduct 3D scans when depth slices or 3D views of the subsurface are
desired. To conduct a 3D survey, proceed as follows.
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 Pavement 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.
