Understanding
Ground Penetrating Radar Applications
When I left
university I was rather excited about entering the world with my piece of
paper. This degree showed I was trained in a specific field and was smart
enough to know what I was talking about. At times, when around non-university
graduates, I felt quite smug knowing I had something they didn't. It was only
when my boyfriend would come home and talks about his work as a geologist, or
rather a geologist's assistant that I felt insanely 'dumb'.
While I
knew about Freud and Kinney, he knew about seismology and ground penetrating
radars. He would sit at the table and explain these procedures to me in simple
words, making me gaze in awe and loathing at his coolness. The ground
penetrating radar was so intriguing.
This Ground Penetrating Radar QLD (GPR) is, as the name suggests, a means of penetrating the
ground with several radars to determine whether or not an object is buried
underneath the stone, ice or other structures. It also identifies any
alterations in the material, and any cracks or voids.
But how? A
question I found myself asking numerous times. Simple, he would say. The radar
pulses image the subsurface and use high levels of electromagnetic frequencies
to be sent into the subsurface. When and if the wave hits a buried object,
crack or void then it will bounce back. The range of the electromagnetic pulse
is measured on a spectrum and is limited by the conductivity of the ground.
He said
that if conductivity is high, the penetration depth is low because the
electromagnetic energy disappears into the substructure's heat causing a loss
of signal. If conductivity is low,(like in ice), then the penetration can be as
high as hundreds of feet.
GPR are
easy to use, safe and more sophisticated than most methods in geology. I wish I
had more access to them in my studies.
While I
knew about Freud and Kinney, he knew about seismology and ground penetrating
radars. The ground penetrating radar was so intriguing.
The radar
pulses image the subsurface and use high levels of electromagnetic frequencies
to be sent into the subsurface. The range of the electromagnetic pulse is
measured on a spectrum and is limited by the conductivity of the ground.
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