Open AccessProjected fringe profilometry using a liquid-crystal spatial light modulator to extend the depth measuring range
Author(s) -
Wei Hung Su,
Chun Hsiang Hsu,
Wei-Chia Su,
Jung Ping Liu
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.003272
Subject(s) - optics , spatial light modulator , profilometer , distortion (music) , materials science , dynamic range , phase modulation , spatial frequency , range (aeronautics) , high dynamic range , liquid crystal , physics , optoelectronics , phase noise , surface finish , amplifier , cmos , composite material
An approach using a liquid-crystal spatial light modulator (LC-SLM) to enlarge the depth measuring range of the projected fringe profilometry is presented. This approach is especially applicable to detect dynamic objects with micro-scale sizes. Compared with a typical 2D image system, the LC-SLM provides a better performance for a 3D shape sensing system. The main advantages include (1) a much higher allowance to increase in the depth measuring range, (2) easiness to compensate perspective distortion and geometric distortion, (3) very high accuracy (in the micron-range) and (4) only one phase measurement needed for operation.