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 Post subject: diameter of pipe
PostPosted: Thu Jun 19, 2014 3:20 pm 
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Joined: Wed May 16, 2012 12:49 am
Posts: 6
hi, it´s posible estimate the diameter of the pipes in this image?

the pipe in the progresive 14 have 36 inch, the next have 12, and the next 8, but i dont can estimate the other pipes. how do?

thank


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 Post subject: Re: diameter of pipe
PostPosted: Thu Jun 19, 2014 3:29 pm 
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Joined: Wed May 16, 2012 12:49 am
Posts: 6
sorry, this is the image

Attachment:
radargrama pa diametros.png
radargrama pa diametros.png [ 669.91 KiB | Viewed 5546 times ]


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 Post subject: Re: diameter of pipe
PostPosted: Sun Jun 22, 2014 7:56 am 
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Joined: Sat Jul 02, 2011 1:55 pm
Posts: 52
Location: Ukraina
jjllovera wrote:
sorry, this is the image

Attachment:
radargrama pa diametros.png



what soft? some GSSI?

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GPR Europe ltd.
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 Post subject: Re: diameter of pipe
PostPosted: Mon Jun 23, 2014 5:41 am 
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Joined: Fri Apr 17, 2009 7:52 am
Posts: 379
Location: Boden, Sweden
to LozaUA, yes, that's RADAN, the post-processing package from GSSI.

to jjllovera, search the velocity analysis tool. You won't be able to enter progressive
diameter changes based on one file only. You need several files at different locations.
However, consider that the "illuminated" cross section of the pipe is not punctual, but
integrates an area into one image. That's the reason you get hyperbolas instead of dots.
This means you will get reflection not only from the part exactly below the antenna, but
also a bit from the sides making your task a little bit more difficult.
Regards,

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 Post subject: Re: diameter of pipe
PostPosted: Thu Jun 26, 2014 4:38 pm 
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Joined: Wed May 16, 2012 12:49 am
Posts: 6
Hello, I am aware of the hyperbolas, I can identify clearly the pipes.

But I can not estimate its diameter.

The software I use is radan 7

Very similar image correspond to very different diameters pipes, then I can conclude that it is not a linear relationship.

There any equation or method to allow me to approach him.

regards


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 Post subject: Re: diameter of pipe
PostPosted: Fri Jun 27, 2014 7:41 am 
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Joined: Fri Apr 17, 2009 7:52 am
Posts: 379
Location: Boden, Sweden
Hi,
I don't use Radan, but I'm sure there is a way of doing what you
are trying to do. And, yes, there is a way to calculate the diameter
of the pipe based on the RDP of the media. It is pretty simple, based
on Pythagoras alone. I have a PDF at home somewhere explaining in
detail how to do it, yet again, check your software manual because
it is there in my opinion. If not get a demo of our software and try it
our tool which does the job pretty easy and fast.
http://www.geoscanners.com/gprsoft.htm
Regards,

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Reinaldo Alvarez Cabrera
Geoscanners AB
Sweden
http://www.geoscanners.com


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