Simultaneous dual directional strain measurement using spatial phase-shift digital shearography

Wang, Yonghong; Gao, Xinya; Xie, Xin; Wu, Shenshen; Liu, Yingxue; Yang, Lianxiang

doi:10.1016/j.optlaseng.2015.12.009

Cited by 51 publications

(10 citation statements)

References 13 publications

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“…An illuminating angle of the reference beam and slit aperture size are selected properly to separate the three spectra in the frequency domain. Then the phase can be obtained by the Windowed Fourier Inverse Transform (WIFT) and the complex amplitude calculations [57,58]. The phase before and after strain from load-driven can be expressed as:[j(x,y)+2pxf0x+2pyf0y]=arctanImfalse[u2u1*false]Refalse[u2u1*false],…”

Section: Methodsmentioning

confidence: 99%

A Strain Distribution Sensing System for Bone-Implant Interfaces Based on Digital Speckle Pattern Interferometry

Zhong

Yang

et al. 2019

Sensors

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This paper aims to provide an effective measurement method for the distribution of deformations and strains focusing on the response to external loading of bone-implant interfaces. To achieve this target, a novel speckle interference imaging method is proposed by introducing phosphate buffer saline medium, in which the samples were completely placed into a phosphate buffer saline solution medium to stable the water molecules. The stability of interferometry imaging is analyzed by using the concepts of co-occurrence matrix and moment of inertia. A series of experiments to measure load-driven deformation and strain in the bone-implant interface was carried out, and the experiments results were analyzed and discussed. It shows that the proposed method is feasible and effective for the no-contact strain measurements of biomaterials in a physiological condition. The proposed strain distribution sensing system will contribute to evaluating computational simulations and improving selection of implant designs and materials.

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Section: Methodsmentioning

confidence: 99%

A Strain Distribution Sensing System for Bone-Implant Interfaces Based on Digital Speckle Pattern Interferometry

Zhong

Yang

et al. 2019

Sensors

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“…In 2016, Xie et al proposed an SPS dual-shearing direction shearography system based on the Mach-Zehnder interferometer, which is a polarized system recording shearograms in the two orthogonal directions simultaneously [48]. In 2016, Wang et al proposed an SPS dual-shearing direction shearography system based on the Michelson interferometer as shown in Figure 11a [49]. The system is composed of two modified Michelson interferometers on the horizontal plane.…”

Section: Multidirectional Sheared Sps-dsmentioning

confidence: 99%

Digital Shearography for NDT: Phase Measurement Technique and Recent Developments

et al. 2018

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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.

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“…Динамические измерения деформации одновременно в двух направлениях с помощью метода Фурье приведены в работе [8], в которой использованы два интерферометра Майкельсона, а для освещения объекта используются два лазера с разными длинами волн. Устранение перекрестной интерференции между выходными пучками из двух интерферометров Майкельсона осуществляется с помощью цветового разделения узкополосными светофильтрами.…”

Section: Introductionunclassified

Сдвиговый Спекл-Интерферометр С Квадролинзой

Вишняков¹,

Минаев²,

Иванов³

et al. 2020

Журнал Технической Физики

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The paper proposes a new optical element – Quad lens, which is used as part of a shearing speckle interferometer (sherograph) to provide measurements of stress-strain states of objects simultaneously in two mutually perpendicular directions. Quad lens consists of four identical sections cut from the original round lenses and spaced from each other to form a gap. Quad lens creates four images of an object that are offset relative to the optical axis by a distance that depends on the size of the gaps between the sectors. Phase recovery from a single speckle interferogram is performed using the spatial phase shift method based on the Fourier transform. To increase the contrast of interference bands, an aperture diaphragm with four holes is installed in front of quad lens sectors, and polarizing channel isolation can be used to separate channels and reduce the influence of cross interference. Experimental results of using a speckle interferometer with quad lens for the study of microdeformation of a round membrane are presented.

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Simultaneous dual directional strain measurement using spatial phase-shift digital shearography

Cited by 51 publications

References 13 publications

A Strain Distribution Sensing System for Bone-Implant Interfaces Based on Digital Speckle Pattern Interferometry

A Strain Distribution Sensing System for Bone-Implant Interfaces Based on Digital Speckle Pattern Interferometry

Digital Shearography for NDT: Phase Measurement Technique and Recent Developments

Сдвиговый Спекл-Интерферометр С Квадролинзой

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