sPHENIX EMCal discussion

[Craig Woody <woody AT bnl.gov>]

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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