A novel light field imaging based 3D geometry measurement technique for turbomachinery blades

Ding, Jingzhong; Li, Haotian; Ma, Haoxin; Shi, Shengxian; New, T. H.

doi:10.1088/1361-6501/ab310b

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…While the technology boasts high resolution and measurement efficiency, its imaging depth is limited by current technology, precluding the ability to measure certain micropore samples at greater depths. 3) Light field imaging technology [7]. The optical field imaging technique is a method of measurement that uses the rules of micro-lens array arrangement to operate on parallax to obtain image depth information.…”

Section: Existing Researchmentioning

confidence: 99%

Geometric characteristics measurement technique for film cooling holes based on spectral interferometry system

Shen,

Xia,

Guo

et al. 2023

Optical Metrology and Inspection for Industrial Applications X

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Section: Existing Researchmentioning

confidence: 99%

Geometric characteristics measurement technique for film cooling holes based on spectral interferometry system

Shen,

Xia,

Guo

et al. 2023

Optical Metrology and Inspection for Industrial Applications X

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“…They introduced a calibration method based on the features of the blade reference surface, eliminating pose errors in the system without the need for additional calibration objects. The area-source method typically employs digital image correlation techniques [13,14] or structured light technology. For example, Huang et al [15] and others proposed an efficient and highly accurate full-section blade measurement technique based on multi-view structured light three-dimensional measurement.…”

Section: Introductionmentioning

confidence: 99%

Measuring the profile of aircraft engine blades using spectral confocal sensors

Chen,

Xue,

Sun

et al. 2024

Meas. Sci. Technol.

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The geometric parameters of aircraft engine blades need to be precisely measured to ensure the quality of the blades for the normal operation of aircraft engines. This study aims to address the challenges of existing measurement systems in balancing efficiency, accuracy, and completeness. Additionally, it aims to enhance the accuracy and robustness of the algorithm for extracting blade profile characteristic parameters. In this paper, a spectral confocal sensor is employed to establish a blade profile measurement system. The design includes a probe sampling strategy, and a standard ball is used to calibrate the sensor probe's light emission direction and the precise rotation center of the turntable. The paper proposes the use of methods such as partition search algorithm, binary search, and curvature segmentation to process point cloud data of blade body and tenon. We have conducted experimental measurements on the blades of an aircraft engine. The acquired three-dimensional point cloud data of multiple sets of blade cross-sections and dovetail sections were processed. After calculation, the maximum measurement errors for chord length, maximum blade thickness, tenon width, bottom height, top angle, and bottom angle are -0.0036mm, -0.00721mm, -0.0102mm, -0.00928mm, 0.0086 °, and -0.0058 °, respectively. This process validates the effectiveness of the proposed method and has high measurement accuracy. Compared with the CMM method, this method is more accurate in measuring small pits and large curvature micro surfaces, with higher measurement integrity and higher measurement efficiency.

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“…Their method showed that a dual light field camera could mitigate the elongation of reconstructed particles and improve the depth resolution. Meanwhile, Shi et al used a single-camera light field PIV to measure the velocity field of a synthetic jet, a self-similar adverse pressure gradient turbulent boundary layer, and supersonic jet and turbomachinery blades [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Tomographic reconstruction of light field PIV based on a backward ray-tracing technique

Cao

Zhang

Hossain

et al. 2021

Meas. Sci. Technol.

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The calculation of the weight matrix is one of the key steps of the tomographic reconstruction in the light field particle image velocimetry (light field PIV) system. At present, the existing calculation method of the weight matrix in light field PIV based on the forward ray-tracing technique (named as Fahringer's method) is very time-consuming. To improve the computational efficiency of the weight matrix, this paper presents a computational method for the weight matrix based on the backward ray-tracing technique in combination with Gaussian function (named as Gaussian function method). An Expectation-Maximization (EM) algorithm is employed for the reconstruction of the 3D particle field, and a summed line-ofsight (SLOS) estimation is further used to accelerate the reconstruction process. The computational accuracy and efficiency of the weight matrix, the reconstruction quality of the 3D particle field, and the velocity field accuracy by Gaussian function method are numerically investigated. Finally, experiments are carried out to verify the feasibility of the weight matrix by Gaussian function method. Numerical results illustrated that Gaussian function method can improve the computational efficiency of the weight matrix by more than 10 times. SLOS is capable of further accelerating the computational efficiency of the overall reconstruction process including the pre-determination, the calculation of the weight matrix and the reconstruction. The velocity field accuracy by Gaussian function method is almost the same as that by Fahringer's method. The experimental results of the 3D-3C velocity field of a laminar flow further verify the feasibility of the computational method for the weight matrix based on Gaussian function.

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A novel light field imaging based 3D geometry measurement technique for turbomachinery blades

Cited by 12 publications

References 22 publications

Geometric characteristics measurement technique for film cooling holes based on spectral interferometry system

Geometric characteristics measurement technique for film cooling holes based on spectral interferometry system

Measuring the profile of aircraft engine blades using spectral confocal sensors

Tomographic reconstruction of light field PIV based on a backward ray-tracing technique

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