BLK 360 Calibration Issue

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James Hall
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Re: BLK 360 Calibration Issue

Post by James Hall » Thu Aug 09, 2018 11:32 pm

Phill wrote:
Thu Aug 09, 2018 10:27 pm
James

I cant see the measurements in those photos. Are you saying that the scanner is changing the distance the further from the scanner you get (kind of like a scale factor), or is it the beam is not level. You seem to indicate it is bending the beam when it should be straight? Is that correct? And this only happen out to a certain distance, after which if comes good. If it was me I'd be getting the targets out, putting the BLK side by side with the C10 and place targets out at series of distances from the two scanners.

Can you place a beam in the two scans aligned to the cloud and then show the centre of the beam in orthogonal view, so we can see the deviation.

The other point here (to do with the height) is the BLK is well known not to have a great level sensor, and there are some post around the forum about it not applying the level readings at all, so maybe you need to toggle levelled off in the registration and rely on the C10 to level up your data.

Cheers

Phill
Hello Phill,

"Are you saying that the scanner is changing the distance the further from the scanner you get"
Yes, scaling of sorts. It looks like the scanner is reporting good angels but the distance measurement is off.

If you open the Images in Paint you can zoom in. I don't know how to control there display size on the forum but they to have enough resolution to read the numbers.

I'll set up and post an orthogonal view tomorrow.

The C-10 data has a constant height that matches the known values for the steel parts and the BLK shows a decrees in measurements the closer you get to the scanner.

I have not tested the data from 12 to 30 feet to see if the point cloud is scaled there as well. (Next test)

The data seams to indicate the error is not a constant scale factor, X,Y but a radial scaling from the scanner position. Starting at around 12 feet from the scanner the distortion is diverging from the C-10 data closer you get to the BLK scanner position where the measurement are significantly smaller then the known value.

The BLK360 data was un-leveled and registered C2C to a C-10 scan. The images show only one scan each to eliminate alignment error.

I had already planed to setup targets at a few different distances to test side by sided with the C-10, a Total station and the BLK 360.
This will have to wait a bit wile I get job delivered.

At this point the only thing I'm using the BLK360 for its Images.

James,

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James Hall
V.I.P Member
V.I.P Member
Posts: 107
Joined: Tue Feb 02, 2010 5:13 pm
Full Name: James E Hall
Company Details: Precision Measurements Inc
Company Position Title: Survey Technician - Cyclone Modeler
Country: USA
Location: Chantilly, VA

Re: BLK 360 Calibration Issue

Post by James Hall » Mon Aug 13, 2018 8:19 pm

I don't know why but the images i posted are at a lower resolution then the originals.
So is cropped out enough to show an example you can read.
BLK360 Steel beam test 1a.jpg
BLK360 Steel beam test 2a.jpg
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