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Digital Shearography for NDT: Phase Measurement Technique and Recent Developments

1
School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei 230009, China
2
Department Mechanical Engineering, Oakland University, Rochester, MI 48309, USA
3
School of Instrumentation Science and Opto-electronics Engineering, Beijing Information Science and Technology University, Beijing 100192, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2662; https://doi.org/10.3390/app8122662
Received: 21 November 2018 / Revised: 11 December 2018 / Accepted: 14 December 2018 / Published: 18 December 2018
(This article belongs to the Special Issue Damage Inspection of Composite Structures)
Composite materials have seen widespread use in the aerospace industry and are becoming increasingly popular in the automotive industry due to their high strength and low weight characteristics. The increasing usage of composite materials has resulted in the need for more effective techniques for nondestructive testing (NDT) of composite structures. Of these techniques, digital shearography is one the most sensitive and accurate methods for NDT. Digital shearography can directly measure strain with high sensitivity when combined with different optical setups, phase-shift techniques, and algorithms. Its simple setup and less sensitivity to environmental disturbances make it particularly well suited for practical NDT applications. This paper provides a review of the phase measurement technique and recent developments in digital shearographic NDT. The introduction of new techniques has expanded the range of digital shearography applications and made it possible to measure larger fields and detect more directional or deeper defects. At the same time, shearography for different materials is also under research, including specular surface materials, metallic materials, etc. Through the discussion of recent developments, the future development trend of digital shearography is analyzed, and the potentials and limitations are demonstrated. View Full-Text
Keywords: digital shearography; nondestructive testing of composite materials; temporal phase-shift technology; spatial phase-shift technology digital shearography; nondestructive testing of composite materials; temporal phase-shift technology; spatial phase-shift technology
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MDPI and ACS Style

Zhao, Q.; Dan, X.; Sun, F.; Wang, Y.; Wu, S.; Yang, L. Digital Shearography for NDT: Phase Measurement Technique and Recent Developments. Appl. Sci. 2018, 8, 2662.

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