User's Manual

ManualsBrandsEarth Science Systems ManualsElectronicsESS Pavement Scanner PS1

GPR4 Pavement Scanner

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User Manual

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Earth Science Systems, LLC

February

2019

Page 10 of 27

1. Turn on the power to the sensor unit and the odometer. Both power switches 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 3 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, Pavement Condition, and GPR4

Record. 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. Although this tab is not normally used when making pavement

density surveys, it is useful for insuring proper system operation. The plot parameters

can be changed by pressing the Plot parameters button (see Figure X). 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).