Investigation of hidden diffuse surfaces using phase-shifting endoscopic digital speckle pattern interferometry

Yan Gao; Sijin Wu; Lianqing Zhu; Lianxiang Yang

doi:10.1117/12.2181384

6 March 2015 Investigation of hidden diffuse surfaces using phase-shifting endoscopic digital speckle pattern interferometry

Yan Gao, Sijin Wu, Lianqing Zhu, Lianxiang Yang

Author Affiliations +

Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94463J (2015) https://doi.org/10.1117/12.2181384
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China

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.

Citation Download Citation

Yan Gao, Sijin Wu, Lianqing Zhu, and Lianxiang Yang "Investigation of hidden diffuse surfaces using phase-shifting endoscopic digital speckle pattern interferometry", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94463J (6 March 2015); https://doi.org/10.1117/12.2181384

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