Displacement fields (U,W) obtained simultaneously by moiré interferometry

Basehore, Michael L.; Post, Daniel

doi:10.1364/ao.21.002558

Cited by 23 publications

(5 citation statements)

References 7 publications

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“…A collimated laser beam illuminates a transmission grating at an angle a such that sina=X,f, (1) where X is the wavelength of the illuminating light and f is the frequency of the grating. Thus, the displacement w can be simply calculated from the interference fringe order N: w=-N, N=O,±1,±2,... (2) It is noted that the sensitivity of the measurement is independent of the frequency of the grating. A specimen that has a mirrorlike surface is placed behind the grating and is positioned in such a way that the transmitted diffraction beam TD impinges on the specimen along its normal direction.…”

Section: Description Of Methodologymentioning

confidence: 99%

New moire interferometry for measuring three-dimensional displacements

Chiang

1994

Opt. Eng

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Section: Description Of Methodologymentioning

confidence: 99%

New moire interferometry for measuring three-dimensional displacements

Chiang

1994

Opt. Eng

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“…The plane reference light transmits vertical the specimen grating. The information of the specimen deformations can be recorded in the holographical plates using double-exposure method, and the in-plane and the out-of-plane displacement field can be separated by filtering [4]. In this program it can be implemented to measure the in-plane and the out-of-plane displacement field synchronously, but the process of filtering is much implicated and is hard to use in the practicable measurement.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Deformation Measurement of 3D Displacement Field

Lee¹,

Luo²,

Chiou³

et al. 2005

KEM

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With the development of modern engineering such as micro-electro-mechanical system (MEMS) and new material, the deformation measurement of 3D displacement field is required. Moiré interferometry has become common for measuring the deformations of two-dimension in-plane displacement field. To solve the problem of 3D displacement field, a system for measuring the deformations of 3D displacement field is designed. By using this system, we can measure the out-of-plane displacement by appending a set of electronic speckle interference system based on Moiré interferometry system. Adjusting the incident angle of the incident light, the transmitting direction of the first order diffracted wave in a Moiré interferometry system is assigned to deviate with a small angle from the vertical direction of the specimen surface. Thus the first order diffracted wave is separated from the place of the appended interference field. The striated patterns of the deformations of 3D displacement field can be obtained at the same time. These striated patterns are recorded respectively by three CCD cameras and are stored and processed by a computer. The synchronous measuring method brings certain amount of measuring errors into the measurement of in-plane displacement. This measuring error is analyzed in theory. When real-time measurement is not required, this system can be changed into another system in which the in-plane and the out-of-plane displacement field are measured by time sharing to reduce the measuring errors. The theoretical derivation and a part of experimental results for verification are presented.

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“…In the few cases where this has been accomplished, there were some disadvantages. Basehore and Post, 3,4 for example, proposed a technique whereby the u and w displacements were recorded together but their approach was complex in that successive optical filtering was required to separate the displacement components. Asundi et al 5 and Asundi and Cheung, 6,7 reported on an approach for simultaneous measurement of u, v, and w; however, the images recorded for in-plane and out-of-plane displacements were recorded from different positions with different magnifications.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional displacement measurement using diffractive optic interferometry

et al. 1997

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A powerful new optical method that utilizes diffractive optic interferometry (DOI) to measure both in-plane and out-of-plane displacement with variable sensitivity using the same optical system is introduced. Sensitivity is varied utilizing various combinations of the different wavefronts produced by a conjugate pair of binary optical elements; a transmission grating is used to produce several illumination beams, while a reflective grating, replicated on the surface of a specimen, provides the reference for the undeformed state. A derivation of the equations that govern the method is included along with a discussion of the experimental tests conducted to verify the theory. Overall, the results are excellent, with experimental data agreeing to within a few percent of the theoretical predictions.

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Displacement fields (U,W) obtained simultaneously by moiré interferometry

Cited by 23 publications

References 7 publications

New moire interferometry for measuring three-dimensional displacements

New moire interferometry for measuring three-dimensional displacements

A Study of the Deformation Measurement of 3D Displacement Field

Three-dimensional displacement measurement using diffractive optic interferometry

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