Journal
OPTICS AND LASERS IN ENGINEERING
Volume 153, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2022.106997
Keywords
Liquid crystal polarization grating; Common-path shearography; Pixelated carrier phase; Nondestructive testing
Categories
Funding
- National Natural Science Founda-tion of China [51805137]
- Fundamental Research Funds for the Central Universities of China [JZ2019HGTB0076]
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The proposed dynamic phase-shifting shearography system utilizes a common-path interferometer and dynamic phase-shifting technique to achieve reliable and concise deformation measurement. The system's compact structure and resilience to environmental disturbances enhance the reliability of shearography applications.
A concise and dependable dynamic phase-shifting shearography system based on common-path interferometer is proposed. Two lateral sheared images with common optical path are generated using a liquid crystal polarization grating (LCPG). The sheared images of the object under test interfere with each other, and a pixelated micropolarizer array is used to introduce pixelated carrier, enabling the measurement of dynamic deformation using dynamic phase-shifting. Compared with the ordinary imaging system, the shearography system only needs to insert LCPG between an imaging lens and a camera with pixelated micropolarizer array. The system is resilient to environmental disturbances benefitting from the compact common-path and dynamic phase-shifting method. Theoretical analysis and experiments have been completed, showing that the system can fully exploit the advantages of shearography and improve the reliability of shearography applications.
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