مقالة علمية
High Spatial-Resolution Digital Phase-Stepping Shearography

Awatef Rashid Al Jabri.


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High Spatial-Resolution Digital Phase-Stepping Shearography

Awatef Rashid Al Jabri.

Digital phase-stepping shearography is a speckle interferometric technique that uses laser speckles to generate the phase map of the displacement derivatives of a stressed object, and hence can map the stresses of a deformed object directly. Conventional digital phase-stepping shearography relies on the use of video cameras of relatively lower resolution, in the order of 5 megapixels or lower, operating at a video rate. In the present work, we propose a novel method of performing high spatial resolution phase stepping shearography. This method uses a 24 megapixel still digital imaging device (DSLR camera) and a Michelson-type shearing arrangement with an edge-clamped, center-loaded plate. Different phase-stepping algorithms were used, and all successfully generated shearograms. The system enabled extremely high-resolution phase maps to be generated from relatively large deformations applied to the test plate. Quantitative comparison of the maximum achieved spatial resolution is made with the video-rate cameras used in conventional shearography. By switching from conventional (video) imaging methods to still imaging methods, significantly higher spatial resolution (by about 5 times) can be achieved in actual phase-stepping shearography, which is of great usefulness in industrial non-destructive testing (NDT).

Digital phase-stepping shearography is a speckle interferometric technique that uses laser speckles to generate the phase map of the displacement derivatives of a stressed object, and hence can map the stresses of a deformed object directly. Conventional digital phase-stepping shearography relies...

مادة فرعية

المؤلف : Awatef Rashid Al Jabri.

مؤلف مشارك : Abedin, Kazi Monowar
Rahman, Sheikh Mohammed

بيانات النشر : Journal of Imaging، 2021مـ.

التصنيف الموضوعي : العلوم التطبيقية|الهندسة .

المواضيع : digital shearography .

speckle interferometry .

phase-stepping .

المصدر : MDPI : .

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