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Basic concepts on GPR

Void detection in two-component annulus grout behind a pre-cast segmental tunnel liner using Ground Penetrating Radar

https://doi.org/10.1016/j.tust.2018.09.032

1 Notes

   In this paper, we can know basic concepts on  FDTD of GPR, and know the parameters for simulation.

Basic concepts on GPR

Basic concepts on GPR

Basic concepts on GPR

Basic concepts on GPR

 

Basic concepts on GPR

 

Basic concepts on GPR

 

 They are still using B-scan signature to judge air void or water filling...

 

2 Em wave attenuation

Basic concepts on GPR

 

https://gpg.geosci.xyz/content/GPR/GPR_fundamental_principles.html

 

Basic concepts on GPR

Fig. 90 Wavelet representing the pulse of EM waves within the GPR signal.

Basic concepts on GPR

 

Fig. 91 GPR signals reflecting off a buried conductor.

 Basic concepts on GPR

Basic concepts on GPR

 The following gives us idea for evaulation of AC GPR EM wave energy anttenuation.

Basic concepts on GPR

An example of the attenuation of electromagnetic waves in air versus inside a conductive is shown on the right. We can see that in the air, the wave experienced little to no loss in amplitude as it propagates( Indeed, the energy loss depends on the height between attenna and ground layer.). In the conductive material however, the amplitude of the wave decreases noticeably as it propagates.

 

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