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Measurement of absolute three-dimensional displacement gradients using tri-color quad-beam digital shearography

Optoelectronics Letters 2023年第8期19卷 487-492页

作者： LI Xuan WU Sijin TANG Xiaojun LI Weixian School of Instrumentation Science and Opto-electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China Beijing Spacecrafts China Academy of Space TechnologyBeijing 100094China

A tri-color quad-beam digital shearography is proposed to achieve the measurement of absolute three-dimensional(3D) displacement gradients.Four laser beams with three different center wavelengths are symmetrically irradiated to the object surface from the upper and lower left and right directions.Four phase maps are then extracted from the two interferograms obtained from two shots.Based on these four phase maps,the absolute 3D displacement gradients are determined.This means of absolute 3D displacement gradient measurement effectively improves the measurement capability of digital shearography and expands its application range.

关键词： shearography absolute displacement

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A robust phase extraction method for overcoming spectrum overlapping in shearography

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Light(Advanced Manufacturing) 2023年第1期4卷 52-63页

作者： Xiangwei Liu Peizheng Yan Yonghong Wang School of Instrument Science and Optoelectronics Engineering Hefei University of TechnologyHefeiAnhui230009China Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei University of TechnologyHefeiAnhui230009China

The advantage of spatial phase-shifting shearography is its ability to extract the phase from a single speckle pattern;however,it often faces spectrum overlapping,which seriously affects phase quality.In this paper,we propose a shearography phase-extraction method based on windowed Fourier ridges,which can effectively extract phase information even in the presence of severe spectrum overlapping.A simple and efficient method was applied to determine the parameters of the windowed Fourier ridges,and a linear variation window was used to match the phase-extraction requirements for different frequency coordinates.A numerical simulation was quantitatively conducted to compare the phase-extraction results of the proposed method with those of the conventional method for various cases,and a shearography system was built with two types of objects to demonstrate the feasibility of the proposed method.

关键词： shearography Spatial carrier Phase extraction Spectrum overlapping

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shearography and its applications-a chronological review

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Light(Advanced Manufacturing) 2022年第1期3卷 1-30页

作者： Rajpal Sirohi Alabama A&M University Normal AL 35762USA

This paper presents the activities in the field of shearography in chronological order and highlights the great potential of this holographic measurement technology.After a brief introduction,the basic theory of shearography is presented.Shear devices,phase-shift arrangements,and multiplexed shearography systems are described.Finally,the application areas where shearography has been accepted and successfully used as a tool are presented.

关键词： Electronic speckle pattern interferometry shearography Non-destructive testing

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A Compact Laser shearography System for On-Site Robotic Inspection of Wind Turbine Blades

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Journal of Artificial Intelligence and Technology 2021年第3期1卷 166-173页

作者： Zhiyao Li Mohammad Osman Tokhi Zhanfang Zhao Haitao Zheng London South Bank University School of EngineeringUK TWI Ltd Granta ParkGreat AbingtonCambridge CB216ALUK

shearography is an optical technique in the field of nondestructive evaluation(NDE)of various materials.Its main advantages are that it is noncontact type and can cover a large area in a single inspection.As a result,although it has been widely acknowledged as an effective technique particularly for NDE of composite materials to detect subsurface defects such as delamination,disbond,cracks,and impact damages,the use of shearography for on-site inspection of wind turbine blades(WTBs)has not been reported.This is due to wind causing structural vibration in the WTB.The solution in this paper is to make the shearography sit on the WTB during inspection when the WTB is parked,so that the relative motion between the shearography and the WTB is minimized within the tolerance of the shearography system.The ultimate goal of the solution is to enable a robot-assisted shearography system to inspect the WTB on-site.This paper presents the research work on a new shearography design for integration with a robotic climber for on-site WTB inspection.The approach is tested and evaluated in experimental settings,and a comparative assessment of the approach with other robotic NDE techniques is carried out.The results demonstrate the potential benefits and suitability of the approach for on-site robotic inspection of WTBs.

关键词： shearography robotic climber DSSPI ESPI NDE wind turbine blade

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