sPHENIX EMCal discussion

[Dan Cacace <dannycacace AT gmail.com>]

Hi All,

Anne asked me to send out the information for the 3D scanner we bought and the scan of a block. We have the EinScan-SP, with an accuracy of ≤0.05 mm and resolution of 0.17 mm ~ 0.2 mm. Attached is a scan I took, as well as four images of the point cloud. The first three show the bumps on the block from the screens and the second three show some small dimples or pitting and texture in the block.

-Dan

 Scan2.stl

On Fri, Aug 31, 2018 at 11:37 AM Craig Woody <woody AT bnl.gov> wrote:

That sounds like it definitely might be worth exploring.

On 8/31/2018 11:25 AM, Sickles, Anne M wrote:

Hi Craig,

This first attempt was at a lab that was more designed for hobbists and art uses on campus.  I don’t think the resolution is good enough and certainly having the image quality depdend on the distance someone was holding an the device away from the block isn’t repeatable enough for us.  

We’ve got information on another engineering focussed facility on campus and we’re going to try that and that’s probably the better way forward.

Best,

Anne

—————————————————————

Anne Sickles

Assistant Professor of Physics

University of Illinois at Urbana-Champaign

—————————————————————

On August 31, 2018 at 10:21:39 AM, Craig Woody (woody AT bnl.gov) wrote:

Hi Dan and Anabel,
A resolution of 0.1 mm is .004", which probably not good enough to
see the detail we would like to see anyway, but the image you showed
looks much worse than that. I presume it's because the distance was so
much larger than where it was specified. The scanner Dan suggested had a
"Point Distance" resolution of 0.09-0.12 mm for the upgraded model (so
about the same), which may have the same problem. However, why was the
distance they chose so large ? I presume it was so that they could
capture the image of the entire block in a single scan. Would it improve
if they reduced the distance and made multiple scans ?

Cheers,
Craig

On 8/31/2018 10:26 AM, Romero Hernandez, Anabel wrote:
> Hi Craig and Dan,
>
> From what they told me, they were using this "Capture Mini" 3D scanner: https://www.3dsystems.com/3d-scanners/geomagic-capture-mini/specifications
>
> The "Capture Mini" has a resolution of 0.1 mm at a distance of ~23 cm and accuracy of 0.034 mm, but they were using a distance of ~1m to scan the block, so the resolution was definitely greater than that.
>
> Best,
> Anabel
> ________________________________________
> From: Craig Woody [woody AT bnl.gov]
> Sent: Friday, August 31, 2018 6:18 AM
> To: Dan Cacace; Romero Hernandez, Anabel
> Subject: Re: [Sphenix-emcal-l] Update on 3D scan of blocks
>
> I was going to ask the same question. From the scanned image, the resolution looks rather poor.
>
> On 8/30/2018 11:28 PM, Dan Cacace wrote:
> Hi Anabel,
>
> Do you happen to know the resolution and accuracy they claim they can achieve or the brand/model of the scanner they use?
>
> Thanks,
> -Dan
>
> On Thu, Aug 30, 2018 at 9:02 PM Romero Hernandez, Anabel <acr4 AT illinois.edu<mailto:acr4 AT illinois.edu>> wrote:
> Hi,
>
> I used one of the 3D scanning services of the UIUC (the "MakerLab") to scan one of the blocks and I'm attaching the results to this e-mail (I'm also attaching pictures of the block for comparison). It seems this service doesn't have enough resolution to see the details of the block, but I'm looking into other UIUC services that might.
>
> Best,
> Anabel
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