Fiber-coupled common-path shearography for simultaneous measurement of surface deformation and slope

A mechanical quantity sensing framework is proposed, which is based on fiber-coupled common-path shearography, for the simultaneous measurement of deformation and slope. An optical fiber directs the reference wave into the system for the generation of holograms without breaking the common-path struc...

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Bibliographic Details
Published in:IEEE sensors journal 2023-08, Vol.23 (15), p.1-1
Main Authors: Wang, Shengjia, Feng, Yingjie, Gao, Shuai, Shi, Pengyuan, Xiong, Jianxuan, Huang, Pengfei, Wang, Jiabin, Gao, Zhan, Wu, Sijin, Sun, Weimin
Format: Article
Language:English
Subjects:
Deformation
DSPI
fiber optics
Optical fibers
Phase measurement
Shearography
surface deformation and slope
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Summary:A mechanical quantity sensing framework is proposed, which is based on fiber-coupled common-path shearography, for the simultaneous measurement of deformation and slope. An optical fiber directs the reference wave into the system for the generation of holograms without breaking the common-path structure. The present shearography possesses three features for mechanical quantity sensing, namely the zero-approaching shear amount, the separate control of spatial carriers, and the scrambled reference wave. Single-shot phase measurement scheme is implemented by the spatial carrier method, in which the deformation and slope are retrieved from a single frame of interference pattern. Fiber scrambling is brought into the system to flatten the intensity distribution of the fiber-directed reference field and deliver a quality-enhanced phase map. Physical principle is demonstrated. Preliminary experiments are carried out to verify the feasibility and functionality of the proposed framework.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2023.3289816