TY - GEN
T1 - Real-Time Shadow Moiré Measurement by Two Light Sources
AU - Cheng, Fa Yen
AU - Chen, Terry Yuan Fang
AU - Lee, Chia Cheng
AU - Lin, Ming Tzer
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided to this study by the Ministry of Science and Technology of Taiwan under Grant No. MOST 106-2221-E-006-106-MY2.
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85085514247
UR - https://www.scopus.com/pages/publications/85085514247#tab=citedBy
U2 - 10.1007/978-3-030-30009-8_15
DO - 10.1007/978-3-030-30009-8_15
M3 - Conference contribution
AN - SCOPUS:85085514247
SN - 9783030300081
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 101
EP - 103
BT - Advancements in Optical Methods and Digital Image Correlation in Experimental Mechanics, Volume 3- Proceedings of the 2019 Annual Conference on Experimental and Applied Mechanics
A2 - Singh, Raman
A2 - Singh, Raman
A2 - Slipher, Geoffrey
PB - Springer
T2 - SEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2019
Y2 - 3 June 2019 through 6 June 2019
ER -