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Proceedings Paper

Investigation of hidden diffuse surfaces using phase-shifting endoscopic digital speckle pattern interferometry
Author(s): Yan Gao; Sijin Wu; Lianqing Zhu; Lianxiang Yang
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Paper Abstract

Digital speckle pattern interferometry (DSPI) is an important optical tool which is widely used in many sophisticated applications. However, a traditional DSPI system can only be used to investigate the outer surfaces which can be easily observed. Therefore, an endoscopic DSPI was proposed to detect the internal and hidden surfaces. It has a rigid or flexible endoscopic tube to allow a hidden surface being clearly imaged. A fiber-optics-based setup makes the proposed DSPI system compact and robust. The temporal phase-shifting technique is used to help precise extraction of phase distributions from speckle patterns.

Paper Details

Date Published: 6 March 2015
PDF: 5 pages
Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94463J (6 March 2015); doi: 10.1117/12.2181384
Show Author Affiliations
Yan Gao, Beijing Information Science and Technology Univ. (China)
Sijin Wu, Beijing Information Science and Technology Univ. (China)
Lianqing Zhu, Beijing Information Science and Technology Univ. (China)
Lianxiang Yang, Oakland Univ. (United States)


Published in SPIE Proceedings Vol. 9446:
Ninth International Symposium on Precision Engineering Measurement and Instrumentation
Junning Cui; Jiubin Tan; Xianfang Wen, Editor(s)

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