Mission Impossible?

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Jamesrye
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Mission Impossible?

Post by Jamesrye »

Hi, I am turning to the LSF to see if anyone has any advice for an upcoming project.

The survey brief is to scan an underground chamber. The problem is that the chamber is only accessible via a 10.5m long pipe. And the pipe only has a diameter of 13cm!

I guess we could lower a BLK Gen 1 down through the pipe (the Gen2 is too fat). Further, wifi isn't going to work as the pipe is steel. As I remember the BLK does have a timer delay option - but I'd love to be able to control it via a cable.

But the client also wants sub millimetre accuracy. If they really do need that accuracy - I'm wondering if there's any options?
Could it be done with some sort of structured light or infrared handheld device? The problem then is how to 'wave the device around'. Or photogram with calibrated cameras.
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Re: Mission Impossible?

Post by pipingdesigner »

sub millimetre accuracy
When you ask a client who doesn't know what they want, "What do you want?", the answer is usually "everything" even though that's almost certainly not what they need.
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Re: Mission Impossible?

Post by Jamesrye »

pipingdesigner wrote: Tue Sep 19, 2023 6:46 pm
sub millimetre accuracy
When you ask a client who doesn't know what they want, "What do you want?", the answer is usually "everything" even though that's almost certainly not what they need.
Yeah, I'm hopeful that we can negotiate on that point.
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Re: Mission Impossible?

Post by Ioannis »

Post a photo of the shaft
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Re: Mission Impossible?

Post by Kruse »

Maybe drop a BLK2GO down the shaft after starting a scann at the top before lowering it? I don't know of any scanning systems that small that can achieve sub mm tolerances though. Once the unit is in the open area down below, just let it sit and collect data for a bit before pulling back up. Should be able to just delete all the points it captures while traveling through the pipe or tell the processing software to ignore those points... if that's even possible. I haven't processed any BLK2GO data yet though, so it's outside my area of knowledge.
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Re: Mission Impossible?

Post by Jason Warren »

Sounds an interesting project... have you looked at void scanners?
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Re: Mission Impossible?

Post by Daniel Wujanz »

Dear James,

one company that should have got a solution for this is the following: https://www.dmt-group.com/

They have a small cavity scanner that should do the trick.

Your first challenge is the narrow pipe and its rotationally invariant nature.

What about the second? Do you have to perform more than 1 scan in the chamber?

I'll try to find out how DMT's system for this purpose is called.

Cheers

Daniel
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Re: Mission Impossible?

Post by Jamesrye »

Thanks for the replies, the void scanner from Carlson looks interesting and I have also found this scanner which is pretty interesting:
https://www.carlsonsw.com/product/carlson-c-als

I think just one scan in the chamber would be sufficient.
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