Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

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Oliver Buerkler
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by Oliver Buerkler »

Hi Matt.

Thanks for your explanation!

Our incliniation sensor measures how much "out of level" the scanner is in both axis. This information is then automatically used by FARO Scene to compensate the data and make the scans horizontal. The compensation is also (always) applied when you used surveyed target coordinates unless the user turns the use of the information off in FARO Scene.
It offers a working range of +/-15° in which the user does not have to care for leveling if he does not want to. But it is not monitoring movements during the scan (not sure if this is really necessary at this short scan times).

Regarding the original question: I am absolutely conform with your opinion regarding accuracy ;)

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Phil Marsh
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by Phil Marsh »

With the Faro120 is it possible to setup over a known co-ordinate and backsight a single target with a known co-ordinate? I think this saves alot of time as less control is needed whilst on site.
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by danielgadowski »

Hi
No Phil, Faro will not be able to do that. You need compensator to be able to use the scanner like that. And I would expect Oliver, as a manufacturer’s representative, to know the differences between compensator and inclination sensor...
Dan
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by Phil Marsh »

danielgadowski wrote:Hi
No Phil, Faro will not be able to do that. You need compensator to be able to use the scanner like that. And I would expect Oliver, as a manufacturer’s representative, to know the differences between compensator and inclination sensor...
Dan
Hi Dan,

So it works by resection then? Although I think as surveyors we tend to over control a site anyway for redunancy.

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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by danielgadowski »

Hi Phil
Yes, it always works based on resection, just like HDS6000 and all other phase scanners. And in that case I believe control redundancy is quite crucial if you are after accurate resuls.
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by mikle-d »

Oliver Buerkler wrote: ...
It offers a working range of +/-15°
...
Hi Oliver!
Can you tell me what will be the value of error at the 50m distance due to 15 degrees of inclination?
I think that 5' (not seconds) is more useful value of compensator range used in most of geodetic instruments, because it's difficult to calculate true corrections for measurements if instrument is out of 5' range.

Mikle
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by joe.3dlm »

danielgadowski wrote:Hi
No Phil, Faro will not be able to do that. You need compensator to be able to use the scanner like that. And I would expect Oliver, as a manufacturer’s representative, to know the differences between compensator and inclination sensor...
Dan
Dan,

It is possible to use a scanner in the way Phil descibes, even without a compensator. However, you must be certain that when the scan is levelled from the inclination sensor data, the centre of rotation is the same as the scanner's origin of measurement.

So knowing this, it is possible to set up over a known point, without levelling the scanner, and backsighting to a known Remote Object.

RiScan Pro certainly offers this function (and I am sure other scanner manufacturer's software does too), and it saves time in the field - the compromise of course is accuracy, as you are relying on the scanner's inclination sensor accuracy, and on only one control point, and on the measurement of the scanner's instrument height.

Joe
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Re: Architecture: Faro LS of Leica SS2 (Pulse or TOF)?

Post by danielgadowski »

Hi Joe,
Perhaps I used a wrong word. OK, theoreticaly it is possible to do that, but I would say it's highly doubtfull you'll get mm accuracy that you will get with compensator. Making sure you set up the scanner directly above known point and that it is absolutly leveled is almost impossible to achieve, and here compensator comes into play. In any surveying instrument (total station, scanner with compensator) you need to make sure you are above known point and leveled within compensator's range.
Additionaly compensator takes active part in data capture, that means that every scanline taken is compensated. This takes into account any movements between the beggining and the end of the scan (comming off level).
I would agree, that perhaps phase based scanners don't need compensator as they survey too quickly, but we should make it clear that inclination sensor is something different from compensator.
And one final thought: is limiting the amount of targets to only one (and saving yourself perhaps one minute) worth capturing data you won't be able to use??
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