Laser scanning accuracy in Aerospace

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Phil Marsh
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Re: Laser scanning accuracy in Aerospace

Post by Phil Marsh »

Joe,

Just going off the topic for a second.. 'Did we once meet whilst I was scanning the John Lewis building in Liverpool'
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Re: Laser scanning accuracy in Aerospace

Post by Joe Parsons »

Ha ha yeah, that was me! Being nosey about what scanner you were using, think one of my colleagues may have pestered you too, what geeks we are!
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Re: Laser scanning accuracy in Aerospace

Post by Phil Marsh »

Joe Parsons wrote:Ha ha yeah, that was me! Being nosey about what scanner you were using, think one of my colleagues may have pestered you too, what geeks we are!
Joe
I cannot remember what we were discussing but I can remember you mentioned you worked for Liverpool Museum.

Anyway small world isnt it !
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Re: Laser scanning accuracy in Aerospace

Post by d.priem »

Once i was at a company called Metris they had a solution for large volume high accuracy measurements called the Laser Radar.

http://www.metris.com/large_volume_metr ... ser_radar/

It's on the edge of laserscanning and lasertracking in my opinion. Capable of high accuracy reflectorless meaurements.

Was wondering if someone ever used it in practice. I only had a short introduction.
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Re: Laser scanning accuracy in Aerospace

Post by Sebas »

I have seen it at control messe in stuttgart. It is not very fast....

Funny detail... Before Metris it was owned by Lieca.
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Re: Laser scanning accuracy in Aerospace

Post by JosephChumbley »

Metris will set you back a cool half million US $ just to get your foot in the door. We have a couple that are used on special projects. 0.005" accuracy, good range, slower than a snail, and not what I'd call portable...

We are successfully using phase and time of flight units on a number of programs... Not everything (in fact not as much as you'd think) needs to be measured at metrology levels in aerospace. By the way, our Leica SS2 measures at <2mm accuracies for ranges in under 10meters. It's proven to be a special case, and we treat it with kid gloves. You need to keep in mind that scanners are still basically hand built, so each one is going to measure differently. Manufacture specs are to cover the worst case unit that comes of the line, and individual testing (including calibration) is a must...


Calibration by the end users is a topic I'd like more discussion on... How do you prove to me the accuracy of your scanner? Conventional survey equipment is calibrated before and after every project. How are you doing this for your scanners?
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Re: Laser scanning accuracy in Aerospace

Post by Peter Wintjens »

Hi,

comment to Matts table:

Re: Laser scanning accuracy in Aerospace
Postby Matt Young » Tue Aug 11, 2009 10:48 am

If you want accurate sub-millimetre measurements then use a laser tracker.

If you want accuracy of 1mm to 2mm use a close range scanner.

If you want accuracy of 2mm to 6mm use a time of flight scanner.
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Re: Laser scanning accuracy in Aerospace

Post by Peter Wintjens »

for close range (1m to 10m) with an accuracy of <0,3mm the SURPHASER 100HSX-SR is the best choice.
Well named airplane manufactures (Boeing, Airbus) are using is already.
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Re: Laser scanning accuracy in Aerospace

Post by scannerman »

Peter Wintjens wrote:for close range (1m to 10m) with an accuracy of <0,3mm the SURPHASER 100HSX-SR is the best choice.
Well named airplane manufactures (Boeing, Airbus) are using is already.
What is the volumetric accuracy per metre of this scanner?
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Re: Laser scanning accuracy in Aerospace

Post by Felix_the_Cat »

JosephChumbley wrote: Calibration by the end users is a topic I'd like more discussion on... How do you prove to me the accuracy of your scanner? Conventional survey equipment is calibrated before and after every project. How are you doing this for your scanners?
Hey Joseph!

Are you in Sunnyvale? Been there many times for various projects.

In my group, I am like a salmon swimming upstream against the overpowering current of "we've always done it that way" in terms of implementing scan and tracker technology into our processes. This is my main problem I deal with on a daily basis. Well, that and people who can't fathom the difference between accuracy and precision, but I digress. And I am quite sure you and I have spent time in the same hotseat trying to explain to some PMO moron that the technology is sound. Trackers are easier to sell. But I am often times at a loss to defend the scanners, beyond saying "you gotta trust me on this one". Not a strong negotiating tactic in a risk adverse environment. And the fact that the manufacturers are so nebulous and deflective when you ask them for some hard numbers for apples to apples comparisons to established technology is extremely frustrating, to say the least.

Anyhoo, when I find a minute I will pm you, maybe we can compare notes.
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