High-resolution 3D translation measurements using point source x-ray stereoscopy

A method for high-resolution measurement of 3D coordinates and translations of small objects is presented, using single x-ray point-source stereoscopy. The theory of the pinhole method is re-derived for a point-source x-ray projection setup using a conical beam. The method is then implemented using...

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Bibliographic Details
Published in:Measurement science & technology 2011-02, Vol.22 (2), p.025502-025502, Article 025502
Main Authors: Salih, Wasil H M, Soons, Joris A M, Dirckx, Joris J J
Format: Article
Language:English
Subjects:
Beads
Detectors
Point sources
Projection
Stereoscopy
Three dimensional
Translations
X-rays
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Summary:A method for high-resolution measurement of 3D coordinates and translations of small objects is presented, using single x-ray point-source stereoscopy. The theory of the pinhole method is re-derived for a point-source x-ray projection setup using a conical beam. The method is then implemented using a micro x-ray tomography setup with a single 8 mu m point source. Stereo projections are obtained by rotating the object over 90 degree between subsequent recordings, and microscopic tungsten beads are used as marker points. The accuracy of the method is tested on a spherical calibration object, and found to be better than 10 mu m. Using a translation stage, the measurement uncertainty for translation measurements was found to be better than 5 mu m along both axes parallel to the detector and at right angles to the detector. Due to the short measurement time and the high resolution, the method will be useful to study the biomechanics of small specimens, and the principle of the method is useful in any cone-beam-based setup.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/22/2/025502