A 3D Optical Surface Profilometer Using a Dual-Frequency LiquidCrystal-Based Dynamic Fringe Pattern Generator

Collection with item attached
2016
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/473465.do
DOI
10.3390/s16111794
Title
A 3D Optical Surface Profilometer Using a Dual-Frequency LiquidCrystal-Based Dynamic Fringe Pattern Generator
Description
This work was supported by 'The Cross-Ministry Giga KOREA Project' grantfrom the Ministry of Science, ICT and Future Planning, Korea.
abstract
We propose a liquid crystal (LC)-based 3D optical surface profilometer that can utilize multiple fringe patterns to extract an enhanced 3D surface depth profile. To avoid the optical phase ambiguity and enhance the 3D depth extraction, 16 interference patterns were generated by the LC-based dynamic fringe pattern generator (DFPG) using four-step phase shifting and four-step spatial frequency varying schemes. The DFPG had one common slit with an electrically controllable birefringence (ECB) LC mode and four switching slits with a twisted nematic LC mode. The spatial frequency of the projected fringe pattern could be controlled by selecting one of the switching slits. In addition, moving fringe patterns were obtainable by applying voltages to the ECB LC layer, which varied the phase difference between the common and the selected switching slits. Notably, the DFPG switching time required to project 16 fringe patterns was minimized by utilizing the dual-frequency modulation of the driving waveform to switch the LC layers. We calculated the phase modulation of the DFPG and reconstructed the depth profile of 3D objects using a discrete Fourier transform method and geometric optical parameters.
provenance
Made available in Cube on 2018-09-28T10:20:19Z (GMT). No. of bitstreams: 0
language
English
author
Joo, Kyung-Il
Kim, Mugeon
Park, Min-Kyu
Park, Heewon
Kim, Byeonggon
Hahn, JoonKu
Kim, Hak-Rin
orcid
Kim, Hak-Rin/0000-0002-2369-2295
accessioned
2018-09-28T10:20:19Z
available
2018-09-28T10:20:19Z
issued
2016
citation
SENSORS(16): 11
issn
1424-8220
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/473465.do
Funder
교육부
Funding Program
BK21플러스사업(0.5)
Project ID
1345258197
Jurisdiction
Rep.of Korea
Project Name
KNU ICT Research and Education Center
rights
openAccess
subject
optical surface profilometry
interference
phase modulation
liquidcrystal
dynamic fringe pattern generator
type
article


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