Dynamic terrain following: nvCPD scanning technique improvement
There is a large number of measurement techniques that is used for a surface inspection and a characterization of different types of materials. One of these techniques is a contact potential difference (CPD) scanning technique. In this project a non-vibrating contact potential difference (nvCPD) met...
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ndltd-GATECH-oai-smartech.gatech.edu-1853-348262013-01-07T20:36:30ZDynamic terrain following: nvCPD scanning technique improvementPyekh, Yury B.Voice coilFringe fieldKelvin probeSurfaces (Technology) AnalysisVolta effectThere is a large number of measurement techniques that is used for a surface inspection and a characterization of different types of materials. One of these techniques is a contact potential difference (CPD) scanning technique. In this project a non-vibrating contact potential difference (nvCPD) method is utilized to measure a work function and a topographical structure of a sample surface. A sample is mounted on a spindle that rotates at high speed. A nvCPD sensor detects work-function variations during movement above the sample surface. There are certain factors that create difficulties during the measurement process. A nonplanar sample surface, the spindle wobble and an incline of a mounted sample impede the safe (without impacting the surface) scanning at a close distance. The goal of this thesis was to implement a height sensor as a feedback device to dynamically control and adjust a CPD sensor flying height. Since a CPD signal is inversely proportional to the flying height, minimization of this height will enhance the signal magnitude, the signal-to-noise ratio and the resolution of measurements.Georgia Institute of Technology2010-09-15T19:09:33Z2010-09-15T19:09:33Z2010-05-19Thesishttp://hdl.handle.net/1853/34826 |
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Voice coil Fringe field Kelvin probe Surfaces (Technology) Analysis Volta effect |
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Voice coil Fringe field Kelvin probe Surfaces (Technology) Analysis Volta effect Pyekh, Yury B. Dynamic terrain following: nvCPD scanning technique improvement |
description |
There is a large number of measurement techniques that is used for a surface inspection and a
characterization of different types of materials. One of these techniques is a contact potential
difference (CPD) scanning technique. In this project a non-vibrating contact potential difference
(nvCPD) method is utilized to measure a work function and a topographical structure of a sample
surface. A sample is mounted on a spindle that rotates at high speed. A nvCPD sensor detects
work-function variations during movement above the sample surface. There are certain factors that
create difficulties during the measurement process. A nonplanar sample surface, the spindle wobble
and an incline of a mounted sample impede the safe (without impacting the surface) scanning at a
close distance. The goal of this thesis was to implement a height sensor as a feedback device to
dynamically control and adjust a CPD sensor flying height. Since a CPD signal is inversely
proportional to the flying height, minimization of this height will enhance the signal magnitude, the
signal-to-noise ratio and the resolution of measurements. |
author |
Pyekh, Yury B. |
author_facet |
Pyekh, Yury B. |
author_sort |
Pyekh, Yury B. |
title |
Dynamic terrain following: nvCPD scanning technique improvement |
title_short |
Dynamic terrain following: nvCPD scanning technique improvement |
title_full |
Dynamic terrain following: nvCPD scanning technique improvement |
title_fullStr |
Dynamic terrain following: nvCPD scanning technique improvement |
title_full_unstemmed |
Dynamic terrain following: nvCPD scanning technique improvement |
title_sort |
dynamic terrain following: nvcpd scanning technique improvement |
publisher |
Georgia Institute of Technology |
publishDate |
2010 |
url |
http://hdl.handle.net/1853/34826 |
work_keys_str_mv |
AT pyekhyuryb dynamicterrainfollowingnvcpdscanningtechniqueimprovement |
_version_ |
1716475377387307008 |