Ground Penetrating Radar (GPR) [Georadar] FDTD Animation #gpr #radar

Finite-difference time-domain (FDTD) animation of a sample ground penetrating radar (GPR) in action. Basically, a transmitting antenna shoots a short electromagnetic pulse (with a central frequency of 600 MHz) into the subsurface where the relative dielectric permittivity is 4. The short pulse is reflected from the air-soil interface and then either the rectangular or circular targets embedded in the subsurface. Then, the scattered signals are recorded by the receiving antenna of the GPR unit. This constitutes a single A-scan for the GPR measurement. Collection of A-scans along a spatial range constitutes the so called B-scans. Depending on the reflectivity of the target and soil properties, the success of GPR detection varies.

For citations, please use the following paper:
M. E. Yavuz, A. E. Fouda, and F. L. Teixeira, "GPR signal enhancement using sliding-window space-frequency matrices," Progress In Electromagnetics Research, Vol. 145, 1-10, 2014.

For B-scan collection animation, check:

Georradar, Георадар, 地中レーダー探査, Bodenradar, Radar à pénétration de sol, Radar penembus tanah, Georadar, Földradar, Bakkepenetrerende radar, Eerdradar, Radar de penetração no solo, رادار قياس الأرض

[meyavuz]

In this animation, I believe the subsurface was lossless. So there cannot be absorption loss due to the dielectric. There is obviously reflection from the interface. In your case, if you have steel surface there would still be large reflection loss as there is almost no penetration into it. For the ceramic case, if the loss coefficient of the ceramic is high, then you can observe both reflection and absorption loss.

[meyavuz]

Hi, Although I don't have any expertise in that specific application, I believe it is possible to measure the diameter. For example, by sending signals in the different frequency bands and comparing with a database, it might be possible to estimate the diameter. I believe you can find more information about it elsewhere online. Thanks

[meyavuz]

Thanks,
Yes, I can do the simulation with your parameters. By the way what should be the dielectric permittivity value of the cylinders? But right now I am short of time. Do you need it for personal use or here at youtube? Let me know maybe I can be of help to you.Thanks

[meyavuz]

Where exactly are you asking? Air-subsurface interface or boundaries?

[IstiaqueHasan]

hi.. is it possible to use GPR to measure the steel rebar diameter in concrete?

[meyavuz]

Hi,
I am using my own code for simulations (based on FDTD). Then I use Matlab for visualization and video generation. So, it is not a commercial code. Once I have time, I can do your simulations. Do you have a deadline? Thanks

[zeroclzy]

it, cool, do you consider dispersion medium & how to set boundary condition?

[meyavuz]

Hi,

Yes it's me. I can recommend Fink's papers on time-reversal. But for basic introduction and concepts you can check my phd thesis. Search google "yavuz etd osu". You should get a link to the dissertation. I will send you a link about it as well. The first two chapters should give you the basics. Let me know if you are looking for more.
Thanks