Real-Time Shadow Moiré Measurement by Two Light Sources

Fa Yen Cheng, Terry Yuan Fang Chen, Chia Cheng Lee, Ming Tzer Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

For accurate measurement, phase-shifting technique is usually adopted to the shadow moiré measurement system. Accurately introducing the amount of phase shift is required in order to extract the phase properly. However, the specimen or system may be moved during the time of image capture, and not suitable for real-time measurement. In order to overcome this drawback and make an in-line measurement, a shadow moiré system consisted of two light source of different colors and a color CCD camera is proposed. The phase shift is introduced by using two light sources illuminate the grating from different position simultaneously. The two moiré fringe patterns are captured by the color CCD camera, and are processed by a fringe analysis scheme using spiral phase transform (SPT) and optical flow techniques. The proposed fringe analysis scheme was applied to a simulated surface and a real specimen. The test results are reported and the validity of the scheme is investigated.

Original languageEnglish
Title of host publicationAdvancements in Optical Methods and Digital Image Correlation in Experimental Mechanics, Volume 3- Proceedings of the 2019 Annual Conference on Experimental and Applied Mechanics
EditorsRaman Singh, Raman Singh, Geoffrey Slipher
PublisherSpringer
Pages101-103
Number of pages3
ISBN (Print)9783030300081
DOIs
Publication statusPublished - 2020 Jan 1
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2019 - Reno, United States
Duration: 2019 Jun 32019 Jun 6

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

ConferenceSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2019
CountryUnited States
CityReno
Period19-06-0319-06-06

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

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  • Cite this

    Cheng, F. Y., Chen, T. Y. F., Lee, C. C., & Lin, M. T. (2020). Real-Time Shadow Moiré Measurement by Two Light Sources. In R. Singh, R. Singh, & G. Slipher (Eds.), Advancements in Optical Methods and Digital Image Correlation in Experimental Mechanics, Volume 3- Proceedings of the 2019 Annual Conference on Experimental and Applied Mechanics (pp. 101-103). (Conference Proceedings of the Society for Experimental Mechanics Series). Springer. https://doi.org/10.1007/978-3-030-30009-8_15