Low-Cost Non-Destructive Inspection by Simplified Digital Speckle Interferometry

Restivo, Gaetano; Isaicu, Gabriel A.; Cloud, Gary

doi:10.1007/s10921-008-0041-5

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…Previous publications have proven that the change in speckle intensity can be related to the deformation and resulting phase change via the equation: where I obj and I ref are the local intensities of the object beam and reference beam, respectively. φ 0 is the unknown and random initial phase distribution of the speckle pattern at the recorded point and Δ φ obj is the phase change due to the objects deformation 8 …”

Section: Simplified Digital Speckle Interferometry Techniquementioning

confidence: 99%

“…The samples were mounted to the table with the sanded surface facing the scattering plate as outlined in previous SDSI experiments which tested composite and aluminum plates 8 . The samples were clamped to the scattering glass frame to ensure that rigid body motion of the abradable liner was not present to skew the results of the test.…”

Section: Experimental Approachmentioning

confidence: 99%

“…φ 0 is the unknown and random initial phase distribution of the speckle pattern at the recorded point and φ obj is the phase change due to the objects deformation. 8 A SDSI setup 8 was used in this experiment, as depicted in Fig. 5 (following section).…”

Section: Simplified Digital Speckle Interferometry Techniquementioning

confidence: 99%

See 2 more Smart Citations

Optical Nondestructive Inspection for Turbofan Engines' Abradable Liners

Betz

Restivo

2010

Experimental Techniques

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Section: Simplified Digital Speckle Interferometry Techniquementioning

confidence: 99%

Section: Experimental Approachmentioning

confidence: 99%

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Optical Nondestructive Inspection for Turbofan Engines' Abradable Liners

Betz

Restivo

2010

Experimental Techniques

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“…1 Moreover, the results of the inspection of optical methods are images that give visual representations of the condition of the components. 2 Optical methods of NDT include thermography, 3 holography, 4 Moire´interferometry, 5 electronic speckle pattern interferometry (ESPI), 6 and shearography. 7 Shearography (as called speckle pattern shearing interferometry) was first introduced as a full-field strain analysis technique by Hung and Taylor.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of defect detection in polymer materials by means of digital shearography with thermal loading

Akbari

Soltani

Farahani

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser shearography is a relatively new and useful method for nondestructive testing of many kinds of material that need robust methods to be applicable in industrial environments. To get the best results of this inspection method, adjusting the loading parameters properly and precisely is of a great consideration. In this article, a new numerical–experimental procedure to study the effects of thermal loading parameters in the shearography test of defected materials is presented. In this regard, a numerical procedure was developed to simulate shearographic fringe patterns using finite element analysis and supplementary programming. The modeling method was evaluated using experimental tests in a Plexiglas circle subjected to the thermal and mechanical loadings. Flat-bottom holes indicating internal defects of the test part were simulated and experimented to study the parameters that should be adjusted and controlled to get desirable outcomes from shearography nondestructive testing. It has been showed that for each distinct case of nondestructive testing, a thermal loading diagram can be extracted to get credible results.

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“…

Research of Non Destructive Testing (NDT) methodology has developed rapidly in recent years [1] [2] . But it is rarely used for small objects such as Micro-electronic Mechanics System.

…”

mentioning

confidence: 99%

Full-field laser vibration measurement in NDT techniques

Yue

Li²,

Yi³

et al. 2008

SPIE Proceedings

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Research of Non Destructive Testing (NDT) methodology has developed rapidly in recent years [1] [2] . But it is rarely used for small objects such as Micro-electronic Mechanics System. Due to the small size of the MEMS, the traditional method of contact measurement seriously affects the parameter of the object measured. So a high accuracy non-contact measurement is required for optimization of MEMS designs and improvement of its reliability [3][4] . With recent advances in photonics, electronics, and computer technology, a Non Destructive Testing (NDT) laser time average interferometry is proposed in the paper. Laser interferometry has the advantages of non-contact, high accuracy, full-field and fast speed, so it can be used to detect cracks in MEMS. A time average measurement method of digital speckle pattern interferometry is proposed to measure the vibration mode of the MEMS in the paper. According to the sudden change of amplitude of vibration mode, a crack can be measured. With the speckle average technology, high accuracy phase-shift, continuous phase scanning technology, combined with optical amplification technology, the resolution of the amplitude reaches 1nm, and the resolution of the crack reaches 5µm. The measurement system being full-field, the measuring speed of the measurement system can reach 512*512 points per one minute.

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Low-Cost Non-Destructive Inspection by Simplified Digital Speckle Interferometry

Cited by 4 publications

References 12 publications

Optical Nondestructive Inspection for Turbofan Engines' Abradable Liners

Optical Nondestructive Inspection for Turbofan Engines' Abradable Liners

Numerical and experimental investigation of defect detection in polymer materials by means of digital shearography with thermal loading

Full-field laser vibration measurement in NDT techniques

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