Tunnel & Void Locating
Being able to locate tunnels, voids, caverns, sinkholes, etc… is a major function of the XL16 IMAGER
PRO. Using EM technology the XL16 IMAGER PRO Sensor Array is able to pick up the signals emitted
by a void or tunnel. The following is the proper procedure for locating a tunnel. The grid pattern does
change when looking for tunnels or voids. Instead of the pattern going forward and to the right, all you
do is one straight line without turning the instrument at all. When doing the line please be sure that there
is enough area on both sides of the suspected tunnel to get enough of the back ground area in so that the
tunnel will stand out clearly. This technique can also be used to locate other anomalies but is best used
for tunnels or larger voids in the earth below you. When you begin with your setup, please be sure that
you have enough room within the time allotted on the software to travel the desired distance. If there is
too much time then you can “Pause” the scan and then stop the scan by clicking on the “Quit” button.
In the above image (Figure 4.6); there is an example of how a tunnel may appear. As you can see, there is
enough background on either side of the void to allow it to stand out better. Here are the exact
procedures for obtaining this image.
1. After stopping scan your screen should only have a single line.
2. Click on the “Side View” button on the top menu bar. Now you should see that same line but sideways.
(Figure 4.7)
3. by clicking only one time on the rotate buttons (Figure 4.8); the view will change from a direct view to
a slightly off-center view, which will enable you to see the tunnel
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