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Optical Engineering

Fast and accurate shape measurement system utilizing the fringe projection method with a ferroelectric liquid-crystal-on-silicon microdisplay
Author(s): Shien Ri; Takashi Muramatsu; Masumi Saka; Hiroyuki Tanaka
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Paper Abstract

Fringe projection methods using the phase-shifting technique have the advantages of fast 3-D shape measurement and high accuracy. The performance of the fringe projection system, including image quality, nonlinearity of the projected intensity, stability, and switching time for multiple phase-shifted patterns, is essential for fast and accurate shape measurement. A fast and accurate measurement system using a ferroelectric liquid-crystal-on-silicon microdisplay and a high-powered light emitting diode light source is developed. Our results indicate that the nonlinearity of the projected intensity and the stability of the fringe projection were dramatically improved compared with an ordinary commercial liquid crystal display projector. The rapid measurement of the warpage distribution of a flip chip ball grid array electronic package was performed by using the developed system. Nine phase-shifted fringe images with a resolution of 1280×960 pixels were recorded in 1.6 s. In addition, the measurement results obtained by our system agreed well with the results obtained from a micrometer and laser focus sensor. The average error was 2.6 µm, and the standard deviation was less than 10 µm with a 6-mm measurement range.

Paper Details

Date Published: 15 May 2012
PDF: 9 pages
Opt. Eng. 51(8) 081506 doi: 10.1117/1.OE.51.8.081506
Published in: Optical Engineering Volume 51, Issue 8
Show Author Affiliations
Shien Ri, National Institute of Advanced Industrial Science and Technology (Japan)
Takashi Muramatsu, Tohoku Univ. (Japan)
Masumi Saka, Tohoku Univ. (Japan)
Hiroyuki Tanaka, SUMITOMO BAKELITE Co., Ltd. (Japan)


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