Vibration analysis by means of digital shearography

Yang, Lianxiang; Steinchen, Wolfgang; Kupfer, Gerhard; Mäckel, Peter; Vössing, Frank

doi:10.1016/s0143-8166(98)00016-5

Cited by 56 publications

(22 citation statements)

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“…Digital shearography is a laser based, whole field, noncontact, nondestructive testing (NDT) method, which has been widely utilized in the aerospace industry as a standard NDT method for composite materials [1][2][3]. A shearography system measures the deformation gradient by detecting the phase difference caused by an applied load [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Modified Michelson interferometer based shearography setup is the most widely used temporal phase-shift shearography setup, which has been accepted as a practical in field NDT method in aerospace and automobile industry for a long time. This setup has the following advantages: (1) ease of changing the shearing amount and shearing direction and (2) simple and reliable structure, which is relatively insensitive to the external disturbances [1][2][3]. However, due to its high requirement of spatial resolution of the CCD camera, a Michelson interferometer based spatial phase-shift shearography system has not been explored yet.…”

Section: Introductionmentioning

confidence: 99%

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Michelson interferometer based spatial phase shift shearography

Xie

Yang

et al. 2013

Appl. Opt.

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This paper presents a simple spatial phase shift shearography based on the Michelson interferometer. The Michelson interferometer based shearographic system has been widely utilized in industry as a practical nondestructive test tool. In the system, the Michelson interferometer is used as a shearing device to generate a shearing distance by tilting a small angle in one of the two mirrors. In fact, tilting the mirror in the Michelson interferometer also generates spatial frequency shift. Based on this feature, we introduce a simple Michelson interferometer based spatial phase shift shearography. The Fourier transform (FT) method is applied to separate the spectrum on the spatial frequency domain. The phase change due to the loading can be evaluated using a properly selected windowed inverse-FT. This system can generate a phase map of shearography by using only a single image. The effects of shearing angle, spatial resolution of couple charge device camera, and filter methods are discussed in detail. The theory and the experimental results are presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Michelson interferometer based spatial phase shift shearography

Xie

Yang

et al. 2013

Appl. Opt.

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“…furthermore, the setup can be used in combination with stroboscopic sample illumination. this technique is well known for vibration analysis and has been applied on a variety of samples [16], [20].…”

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confidence: 99%

Investigation of contact acoustic nonlinearity in delaminations by shearographic imaging, laser doppler vibrometric scanning and finite difference modeling

Sarens

Verstraeten

Glorieux

et al. 2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Full-field dynamic shearography and laser Doppler vibrometric scanning are used to investigate the local contact acoustic nonlinear generation of delamination-induced effects on the vibration of a harmonically excited composite plate containing an artificial defect. Nonlinear elastic behavior caused by the stress-dependent boundary conditions at the delamination interfaces of a circular defect is also simulated by a 3-D second-order, finite-difference, staggered-grid model (displacement-stress formulation). Both the experimental and simulated data reveal an asymmetric motion of the layer above the delamination, which acts as a membrane vibrating with enhanced displacement amplitude around a finite offset displacement. The spectrum of the membrane motion is enriched with clapping-induced harmonics of the excitation frequency. In case of a sufficiently thin and soft membrane, the simulations reveal clear modal behavior at sub-harmonic frequencies caused by inelastic clapping.

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mentioning

confidence: 99%

“…Compared with other testing method, ESSPPI also has the advantages of vibration-immunity [4,5] , sensitivity-adaptable [6] and direct measurements of the displacement [7,8] . The electronic speckle interferometric method with phaseshift technique [9] was firstly proposed by Johansson in 1989. In this paper, a new electronic speckle shearing phase-shifting pattern interferometer based on Michelson interferometer is designed, the shearing interferometry and phase-shift technique are integrated in the electronic speckle measurement.…”

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confidence: 99%

Design and experiment of electronic speckle shearing phase-shifting pattern interferometer

Jing

et al. 2008

Optoelectron. Lett.

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An electronic speckle shearing phase-shifting pattern interferometer (ESSPPI) based on Michelson interferometer was based in this paper. A rotatable mirror driven by a step motor in one of its reflective arm is used to generate an adjustable shearing and the mirror driven by piezoelectric transducer (PZT) in the other reflective arm was used to realize phaseshifting. In the experiments, the deformation of an aluminum plate with the same extern-force on different positions and different forces on the same position is measured. Meanwhile, the phase distribution and phase-unwrap image of the aluminum plate with the extern-force on its center position is obtained by the four-step phase-shifting method.The electronic speckle shearing phase-shifting pattern interferometer (ESSPPI) [1] is a precise measuring technology developed on electronic speckle interferometry [2,3] , it has the merits of high accuracy, non-destructive testing and full-field measurement. Compared with other testing method, ESSPPI also has the advantages of vibration-immunity [4,5] , sensitivity-adaptable [6] and direct measurements of the displacement [7,8] . The electronic speckle interferometric method with phaseshift technique [9] was firstly proposed by Johansson in 1989. In this paper, a new electronic speckle shearing phase-shifting pattern interferometer based on Michelson interferometer is designed, the shearing interferometry and phase-shift technique are integrated in the electronic speckle measurement.The scheme of the electronic speckle shearing phase-shift pattern interferometer system is shown in Fig.1. It consists of four parts: light source, Michelson interferometer, central controlling unit, image acquisition module. The main structure is the Michelson interferometer with a rotatable arm driven by stepping motor and a mobile arm driven by PZT.The working principle of the testing system is as follows: The continuous light of 532 nm from LD is collimated onto the surface of the interested object, which is deformed by the extern force. The coherent light is reflected into the Michelson interferometer by the object, and divided into two beams which transmits in different interferometric arms then. The speckle interferogram is received by the CCD. In order to generate the shearing, the mirror in one of reflective arm needs to rotate by a little angle, which enables two adjacent points image on the same point in the interferogram. The phase shifting is realized by the movement of the mirror driven by PZT in the other reflective arm.

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Vibration analysis by means of digital shearography

Cited by 56 publications

References 0 publications

Michelson interferometer based spatial phase shift shearography

Michelson interferometer based spatial phase shift shearography

Investigation of contact acoustic nonlinearity in delaminations by shearographic imaging, laser doppler vibrometric scanning and finite difference modeling

Design and experiment of electronic speckle shearing phase-shifting pattern interferometer

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