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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 21 — Jul. 20, 2009
  • pp: 4158–4169

Sensor fusion of phase measuring profilometry and stereo vision for three-dimensional inspection of electronic components assembled on printed circuit boards

Deokhwa Hong, Hyunki Lee, Min Young Kim, Hyungsuck Cho, and Jeon Il Moon  »View Author Affiliations


Applied Optics, Vol. 48, Issue 21, pp. 4158-4169 (2009)
http://dx.doi.org/10.1364/AO.48.004158


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Abstract

Automatic optical inspection (AOI) for printed circuit board (PCB) assembly plays a very important role in modern electronics manufacturing industries. Well-developed inspection machines in each assembly process are required to ensure the manufacturing quality of the electronics products. However, generally almost all AOI machines are based on 2D image-analysis technology. In this paper, a 3D-measurement-method-based AOI system is proposed consisting of a phase shifting profilometer and a stereo vision system for assembled electronic components on a PCB after component mounting and the reflow process. In this system information from two visual systems is fused to extend the shape measurement range limited by 2 π phase ambiguity of the phase shifting profilometer, and finally to maintain fine measurement resolution and high accuracy of the phase shifting profilometer with the measurement range extended by the stereo vision. The main purpose is to overcome the low inspection reliability problem of 2D-based inspection machines by using 3D information of components. The 3D shape measurement results on PCB-mounted electronic components are shown and compared with results from contact and noncontact 3D measuring machines. Based on a series of experiments, the usefulness of the proposed sensor system and its fusion technique are discussed and analyzed in detail.

© 2009 Optical Society of America

OCIS Codes
(150.6910) Machine vision : Three-dimensional sensing
(330.1400) Vision, color, and visual optics : Vision - binocular and stereopsis
(150.3045) Machine vision : Industrial optical metrology

ToC Category:
Machine Vision

History
Original Manuscript: March 6, 2009
Revised Manuscript: June 7, 2009
Manuscript Accepted: June 25, 2009
Published: July 14, 2009

Citation
Deokhwa Hong, Hyunki Lee, Min Young Kim, Hyungsuck Cho, and Jeon Il Moon, "Sensor fusion of phase measuring profilometry and stereo vision for three-dimensional inspection of electronic components assembled on printed circuit boards," Appl. Opt. 48, 4158-4169 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-21-4158

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