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Sept.18, 2013

Vol. 114, No. 1

Web Exclusives

Video: Inside the Princeton Grinder Lab

Posted on September 10, 2013


Watch footage of the grinding, imaging, and 3-D reconstruction process at Adam Maloof’s Princeton Grinder Lab.

Video courtesy of the Princeton Grinder Lab and Situ Studio.

An overview of GIRI, from the Princeton Grinder Lab website:

“GIRI, the Grinding, Imaging and Reconstruction Instrument, was designed and built to generate 3D digital models of embedded objects in materials such as rock and metal.

“The instrument works by employing an automated routine of serial sectioning and imaging. Sectioning is accomplished by a precision CNC grinder. An integrated 80 megapixel camera acquires images with high precision registration and 48 bit color. This process destroys the sample while creating a permanent digital archive of serial images. Automated routines using color and textural vision algorithms isolate complex structures and objects. Hundreds of these segmented slices are combined to create 3D mathematical models. Quantities such as porosity and permeability can be computed directly from the models. Models can also be used for hydrodynamic simulation, morphological analysis, and a variety of other computational simulations. GIRI excels at identifying embedded objects with weak density contrasts that might otherwise be invisible to X-ray CT scanning methods. GIRI can process exceptionally large samples (20,000 cm3) with heterogenous characteristics.”

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3 Responses to Video: Inside the Princeton Grinder Lab

Robert Thomas '58 Says:

2013-09-18 11:03:50

Okay, I was an English major, but a brief commentary on what we were watching would have been helpful to us Luddites. Still, fascinating for all that. Thanks!

Brett Tomlinson, PAW Says:

2013-09-18 12:15:00

Thanks, Robert. We've added Maloof's description of GIRI, the Grinding, Imaging and Reconstruction Instrument, below the video.

Norman Rubin *72 Says:

2013-11-01 11:18:23

Robert, I'd like a narration, too, but I think I may be able to help a bit. I don't completely understand the video of the process -- e.g., is that a grinding pass or the prelim cleaning pass? And why does the sample seem to be in two places at once? But the computer-generated graphics starting around 1:25 and showing the results seem pretty clear. The sample seems to be a heterogeneous mixture of round objects in a surrounding substrate -- as if a section of pebbles in beach sand were made into rock. The first CG animation shows the sequence of thin CT-like "slices," then the second shows only the "pebbles" in place, as if suspended in clear plastic.
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