Double-slit based carrier frequency speckle interferometric system with large viewing field

Meng, 朱猛 Zhu; Xiang-yu, 李翔宇 Li; Long, Ningbo; Zhanhua, 黄战华 Huang

doi:10.3788/ope.20142201.0013

Cited by 2 publications

(1 citation statement)

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“…Some efforts for enlarging the viewing angle to increase the inspection area have been made. For example, the introduction of the 4f system combined with the Michelson interferometer has been shown to be effective for enlarging the inspection area [6,24]. However, the Fourier lens adds additional complexity to the interferometer.…”

Section: Discussionmentioning

confidence: 99%

Inspection of the interior surface of cylindrical vessels using optic fiber shearography

Liu

Quan

et al. 2017

Meas. Sci. Technol.

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In this study, a shearography system integrated with a coherent fiber-optic illumination and a fiber-optic imaging bundle is presented to inspect the quality of the interior surface of a cylindrical vessel for safety purposes. The specific optical arrangement is designed for the inspection of a certain area at a small working distance. The optical arrangement of the system was assembled and an aluminum honeycomb sample was evaluated to demonstrate the capability of the system. The important relationship between the image quality and the working distance, as well as the field of view, is discussed. The system has been applied for the inspection of the interior surface of a cylindrical vessel. The experimental results suggest that the shearography system integrated with optical and image fibers can effectively minimize the size of the inspection device and be capable of evaluating the interior surface of cylindrical structures.

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Section: Discussionmentioning

confidence: 99%

Inspection of the interior surface of cylindrical vessels using optic fiber shearography

Liu

Quan

et al. 2017

Meas. Sci. Technol.

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Dual-lens system in enlarging the viewing angle for the Michelson interferometer

Feng

et al. 2021

Appl. Opt.

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Shearography has been widely accepted as a non-destructive evaluation tool in engineering. However, the field of view is usually limited due to the use of the Michelson optical arrangement if the working distance is strictly constrained. In order to improve efficiency, we propose a dual-lens system to expand the view angle of the Michelson optical arrangement. Two imaging lenses, which are entitled as the objective lens and camera lens, are placed in front of and behind the Michelson interferometer, respectively. The optical arrangement has been set up and compared with the well-known 4f optical system. It is found that the proposed optical arrangement is simple to construct, and the brightness distribution is uniform over the whole image. The new setup has been applied to the inspection of a cylindrical steel shell with a rubber plate bonding on its inside surface. The debonding defects have been evaluated using the proposed shearography system at a working distance of 200 mm. By selecting an objective lens with a focal length of 2.8 mm, the viewing angle was enlarged in inspecting a field with 500 mm by 500 mm at one shot.

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Double-slit based carrier frequency speckle interferometric system with large viewing field

Cited by 2 publications

References 0 publications

Inspection of the interior surface of cylindrical vessels using optic fiber shearography

Inspection of the interior surface of cylindrical vessels using optic fiber shearography

Dual-lens system in enlarging the viewing angle for the Michelson interferometer

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