Online 3D Displacement Measurement Using Speckle Interferometer with a Single Illumination-Detection Path

Lü, Min; Wang, Shengjia; Bilgeri, Laura Maria; Song, Xian Hui; Jakobi, Martin; Koch, Alexander W.

doi:10.3390/s18061923

Cited by 21 publications

(10 citation statements)

References 44 publications

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“…Both of these two phase maps were combinations of in-plane and out-of-plane strains in accordance with Eqs. (12) and (13). These two coupled phase maps were acquired through vertical shearing that was parallel to the notch direction.…”

Section: Three-point Bending Fracture Testmentioning

confidence: 99%

“…Holography and shearography are whole-field, non-invasive optical interferometric methods that allow measuring shape [1][2][3][4][5], displacement [6][7][8], strain [9,10], and curvature [11] of a surface. They have the capability of simultaneous multi-component analyses [12][13][14]. Classified by sensitivity, speckle interferometry for multi-component measurements can be divided into single-sensitive and multi-sensitive techniques.…”

Section: Introductionmentioning

confidence: 99%

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Real-time dual-sensitive shearography for simultaneous in-plane and out-of-plane strain measurements

Dong¹,

Wang²,

Lü³

et al. 2019

Opt. Express

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A real-time, dual-sensitive shearography system using a single-wavelength laser was developed for simultaneous and dynamic in-plane and out-of-plane strain measurements. The shearography system is capable of measuring crack-tip deformation fields quantitatively. A spatial multiplexing technique based on Fourier transform is employed for simultaneous and dynamic multi-component phase retrieval. Two slit spatial filters and a common-path shearing interferometer are used to obtain an improved phase quality for crack-tip deformation measurements. Mode-I fracture experiments under three-point bending were conducted to validate the feasibility and the capability of this method.

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Section: Three-point Bending Fracture Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Real-time dual-sensitive shearography for simultaneous in-plane and out-of-plane strain measurements

Dong¹,

Wang²,

Lü³

et al. 2019

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ultra-precision displacement measurement technology has become a research focus in the field of measurement technology [1][2][3]. Displacement measurement methods have a wide range of application requirements in different fields, such as structural health monitoring [4,5], civil engineering [6][7][8], and manufacturing industries [9,10]. In particular, with the development of science and technology, the demand for precision displacement measurement technology has increased in precision instrument manufacturing, precision machine tools, and precision movement platforms [11,12].…”

Section: Introductionmentioning

confidence: 99%

Displacement Measurement Method Based on the Rotating Paraboloid Array

Zhang

et al. 2019

Applied Sciences

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Using an optical freeform surface to realize the precision measurement of displacement has become a research focus in the present day. However, the measurement range of this method is limited by the size of the freeform surface processed. In order to overcome this difficulty, this paper presents a two-dimensional displacement measurement system with a large range, which is composed of a slope sensor and a rotating paraboloid array. The slope sensor utilizes the optical structure of an autocollimator with minor optimization, and the rotating paraboloid array expands the measurement range of the system in a discrete manner. The experimental results showed that the optimized optical system enhanced the measurement accuracy to ±0.4 μm within the range of 1500 μm and the overall measurement error was approximately ±2 μm when measured within the range of 450 mm. The developed measurement system has potential applicability for detection of errors, such as the position error and straightness error of multi-axis systems.

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“…By following particular procedures to generate the spatial-carrier frequency, the phase map can be obtained from a single interferogram on the basis of the Fourier transformation procedure, which is named the spatial carrier phase-shift method [22][23][24].Many researchers have recently proposed digital speckle pattern interferometry, which can measure three-dimensional (3D) displacements by using spatial carrier phase-shift method. Multi-directions of illumination [24,25] or observation [26,27] are used to generate three different sensitivity vectors. Then, the three orthogonal displacement components can be evaluated.…”

mentioning

confidence: 99%

“…Many researchers have recently proposed digital speckle pattern interferometry, which can measure three-dimensional (3D) displacements by using spatial carrier phase-shift method. Multi-directions of illumination [24,25] or observation [26,27] are used to generate three different sensitivity vectors. Then, the three orthogonal displacement components can be evaluated.…”

mentioning

confidence: 99%

Measurement of In-Plane Displacement in Two Orthogonal Directions by Digital Speckle Pattern Interferometry

et al. 2019

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The measurement of in-plane displacement in two orthogonal directions is of considerable significance for modern industries. This paper reports on a spatial carrier phase-shift digital speckle pattern interferometry (DSPI) for the simultaneous measurement of in-plane displacement in two orthogonal directions. The object is illuminated from a single direction and observed from four symmetrical directions simultaneously. One pair of the four observation directions is sensitive to in-plane displacement in one direction, and the other pair is sensitive to in-plane displacement in the perpendicular direction, resulting in the displacement in two directions being measured independently. The polarization property of light is used to avoid cross-interference between the two pairs of beams. Spatial carrier frequencies are generated by aperture misalignment, and the displacement in two directions is modulated onto the same interferogram. With a spatial carrier phase-shift technique, the displacement can be separated in the frequency domain and the phase can be evaluated from a single interferogram in real time. The capability of DSPI is described by theoretical discussions and experiments. Appl. Sci. 2019, 9, 3882 2 of 10 (DSPI) [3,12]. The sensitivity of Moiré interferometry and DSPI is higher than that of DIC, and the set-up of DSPI is simpler than that of Moiré interferometry. Because of the high sensitivity and flexibility of DSPI, it has been well-accepted in experimental mechanics, displacement and displacement measurements, and strain measurements.In DSPI, in-plane displacement is measured by evaluating the phase difference of two recorded speckle interferograms under load. The surface under the test is illuminated from two symmetrical directions with a single direction of observation [13], or is observed from two symmetrical directions with a single direction of illumination [14]. The measurement of a surface displacement in two orthogonal directions is often required for the complete characterization of displacement. In traditional DSPI, in-plane displacement is measured in the single direction, depending on the illumination or observation direction. For example, if the surface is illuminated from two symmetrical directions, the measured displacement is in the vector direction, which is the subtraction of the vector directions of the two illumination beams. To measure the displacement in the perpendicular direction, the illumination beams must be rotated 90 degrees around the viewing axis. To make a system sensitive to displacement in two orthogonal directions, two pairs of beams, with different directions, should sequentially illuminate the surface. Thus, two separate interferograms can be recorded and combined vectorially [1,3,8,15]. To avoid cross-interference between the two pairs of beams, they should not illuminate the surface at the same time. Sequential measurement takes more time than usual, making the simultaneous measurement of transient or non-repeatable events, that require displacement in two orth...

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Online 3D Displacement Measurement Using Speckle Interferometer with a Single Illumination-Detection Path

Cited by 21 publications

References 44 publications

Real-time dual-sensitive shearography for simultaneous in-plane and out-of-plane strain measurements

Real-time dual-sensitive shearography for simultaneous in-plane and out-of-plane strain measurements

Displacement Measurement Method Based on the Rotating Paraboloid Array

Measurement of In-Plane Displacement in Two Orthogonal Directions by Digital Speckle Pattern Interferometry

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