Hypobola

[naween dissanayake]

Dear team,

I plan to see some parabola of the radiogram and I generate almost everything but for some reason, I only can see the material difference and this is PVC pipes.

Here I will attach all the files.

Can somebody tell me why I can not see the parabola?

#title: A-scan from a pvc cylinder buried in a dielectric half-space
#domain: 0.240 0.210 0.002
#dx_dy_dz: 0.002 0.002 0.002
#time_window: 6e-9

#material: 8 0.005 1 0 asphalt
#material: 12 0.005 1 0 cement_concret
#material: 4 0.005 1 0 granula_material
#material: 12 0.01 1 0 soil
#material: 5.8 0 1 0 pvc

#waveform: ricker 1 0.6e9 my_ricker
#hertzian_dipole: z 0.040 0.170 0 my_ricker
#rx: 0.140 0.170 0
#src_steps: 0.002 0 0
#rx_steps: 0.002 0 0

#box: 0 0.150 0 0.24 0.170 0.002 asphalt

#box: 0 0.04 0 0.240 0.150 0.002 granula_material
#box: 0 0.02 0 0.240 0.04 0.002 soil

#cylinder: 0.095 0.1 0 0.095 0.1 0.002 0.020 pvc

#geometry_view: 0 0 0 0.240 0.210 0.002 0.002 0.002 0.002 mypvc n

Kind regards 

Naween 

[Craig Warren]

It looks like your domain size is too small for you to see any sort of hyperpola from the cylindrical target. Are you sure you didn't see a warning about stepping your source/receiver into the PML when you ran the model? 

Given the distance between source and receiver (100mm) you will need a larger domain, and to start scan (source/receiver position) further to the left. You should then be able to see the hyperbolic response.

Craig

[naween dissanayake]

Dear Craig,

May I ask if you could send me some sample input files that are related to the road cross-section to take a look at, it will be really beneficial for my project?  

Kind regards 

Naween 

[Craig Warren]

Sorry - we don't have sample files, only the examples in the gprMax package.

Craig