DETERMINATION OF DRIFT DISTORTION IN SEM MICROGRAPHS ACQUIRED BY DIFFERENT MAGNIFICATIONS AND ACQUISITION TIMES |
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| V. Petránová, P. Koudelka, J. Valach |
- Abstract:
- In the experimental mechanics wide variety of optical methods including measurement of deformation at reduced length scales using combination of computer vision and scanning electron microscopy (SEM) have been recently applied. One of suitable methods for in-plane measurement of displacements and deformations in the micrographs obtained by SEM is the 2D digital image correlation. In contrast to images obtained in visible spectrum by classical optical devices temporally-varying distortions known as drift distortion are present in the SEM micrographs. These distortions are caused by positional errors of electron beam during scanning process. Magnitude of this effect decreases with higher conductivity of the sample and is also influenced by magnification and scanning time. For this purpose measurement of distortion was performed on a series of micrographs of conductive samples acquired at different magnifications and acquisition times. Surface of each sample was covered with liquid silver to ensure adequate contrast pattern necessary for determination of distortion’s magnitude and distortion magnitudes were assessed.
- Keywords:
- drift distortion, scanning electron microscopy, digital image correlation
- Download:
- IMEKO-YSESM-2014-020.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC15
- Event name:
- TC15 Youth Symposium 2014
- Title:
13th Youth Symposium on Experimental Solid Mechanics
- Place:
- Děčín, CZECH REPUBLIC
- Time:
- 29 June 2014 - 02 July 2014