Three-dimensional shape measurement of specular surfaces by orthogonal composite fringe reflection

Xie, Peng; Tang, Minxue; Wei, Xiaoru

doi:10.1117/12.904805

Cited by 7 publications

(5 citation statements)

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“…Therefore, a 1D N-phase shift allowed for the acquisition of the two orthogonal phases, with only N exposures instead of 2N exposures. Xie et al proposed the orthogonal composite fringe reflection technique to measure specular surfaces [ 49 ]. In this technique, the phase distributions in two directions were extracted by a 2D Fourier algorithm from the distorted composite fringe pattern.…”

Section: Principlementioning

confidence: 99%

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Zhang

Wang

Huang

et al. 2017

Sensors

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The fast development in the fields of integrated circuits, photovoltaics, the automobile industry, advanced manufacturing, and astronomy have led to the importance and necessity of quickly and accurately obtaining three-dimensional (3D) shape data of specular surfaces for quality control and function evaluation. Owing to the advantages of a large dynamic range, non-contact operation, full-field and fast acquisition, high accuracy, and automatic data processing, phase-measuring deflectometry (PMD, also called fringe reflection profilometry) has been widely studied and applied in many fields. Phase information coded in the reflected fringe patterns relates to the local slope and height of the measured specular objects. The 3D shape is obtained by integrating the local gradient data or directly calculating the depth data from the phase information. We present a review of the relevant techniques regarding classical PMD. The improved PMD technique is then used to measure specular objects having discontinuous and/or isolated surfaces. Some influential factors on the measured results are presented. The challenges and future research directions are discussed to further advance PMD techniques. Finally, the application fields of PMD are briefly introduced.

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Section: Principlementioning

confidence: 99%

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Zhang

Wang

Huang

et al. 2017

Sensors

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“…Then, the two integer phases can be extracted from one captured fringe image, so the capture time can be further reduced by half. The technique of orthogonal fringes was once used in FRT by some authors [21,22] to obtain the slopes of x and y directions by one measurement, but in these works sinusoid fringes were combined rather than binary fringes, and these fringes were not used for phase unwrapping. (2) Our OGF method expands on binary fringes by introducing intermediate gray levels and corrects the nonuniform intensity of the captured fringe images to avoid gray-level identification ambiguities.…”

Section: Introductionmentioning

confidence: 99%

Fast temporal phase unwrapping method for the fringe reflection technique based on the orthogonal grid fringes

Zhai

2015

Appl. Opt.

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In traditional temporal phase unwrapping (TPU) algorithms, wrapped phases with different spatial frequencies are obtained from several groups of phase shift fringes to calculate the unwrapped phase. Therefore, the necessary quantity of captured fringes is very large, especially for the fringe reflection technique (FRT), since a pair of phases should be unwrapped to get the slopes of two perpendicular directions. In this paper, we propose a fast TPU algorithm based on the orthogonal grid fringes by which only one image is needed to extract the two integer phases for each frequency instead of two groups of phase shift fringes, and then they can be added into the wrapped phases separately to complete the unwrapping. There are ridge errors in the direct unwrapped phases, but they are significantly suppressed by our pseudo-phase-shift strategy without any extra captured fringes. The proposed method is robust and effective where the fringe amount used for unwrapping is only 1/4 of the previous similar algorithm and 1/6-1/8 of the traditional TPU methods. The detailed comparison of measurement time is also given, which demonstrate that the FRT measurement can be accelerated in most cases by our method. The algorithm is validated by the experiments, which still works well for the severely defocusing fringes or complex specimen.

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“…But, it also has its own disadvantages, such as color cross-talk between each color channel and color absorption of surface materials which restricts its use. There are also other types of single shot techniques 17,18 and most of them utilize FT method which will be suffered from errors we mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, single-shot deflectometry has been demonstrated by two ways of FT and method using a gray scale camera 7,8,17,18 and multiplexing phase-shifting method using a color camera 9 . The FT method can be free from the cross-talk error between color channels, but it will have a considerable edge error.…”

Section: Introductionmentioning

confidence: 99%

Single-shot deflectometry for dynamic 3D surface profile measurement by modified spatial-carrier frequency phase-shifting method

Nguyen

Ghim

Rhee

2019

Sci Rep

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We propose a new concept of single-shot deflectometry for real-time measurement of three-dimensional surface profile using a single composite pattern. To retrieve an accurate phase from one-frame composite pattern, we adapt the Fourier Transform (FT) method and the spatial carrier-frequency phase-shifting (SCPS) technique to our proposed deflectometry. Based on Lissajous figure and ellipse fitting method, we also correct the phase extraction error in SCPS technique by reducing the effect of background and modulation variations. The proposed technique is verified by comparing our measurement results with phase-shifting deflectometry, and the maximum difference between two measurement results is less than 30 nm rms. We also test the robustness to vibration and the measurement capability for dynamic object.

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Three-dimensional shape measurement of specular surfaces by orthogonal composite fringe reflection

Cited by 7 publications

References 0 publications

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Fast temporal phase unwrapping method for the fringe reflection technique based on the orthogonal grid fringes

Single-shot deflectometry for dynamic 3D surface profile measurement by modified spatial-carrier frequency phase-shifting method

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