A Calibration Method of Inner Bore Profile Detecting on Electromagnetic Railgun

Ma, Xiao; Cao, Ruifen; Zhang, Yu; Hu, Xueyi; Li, Fadong

doi:10.1109/jsen.2021.3095623

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The circular structured light measurement system is primarily based on the laser triangulation principle [14] and the close-range camera photography measurement technique to describe the relationship between object points and image points according to the pinhole model [21] (figure 1). The camera coordinate system is used to create the local coordinate system O-XYZ, and the camera optical center at O is set as the origin of the system coordinates.…”

Section: Mathematical Modelmentioning

confidence: 99%

Calibration of a circular structured light measurement system based on a multi-diameter calibrator

Zuo²,

Fan³

et al. 2023

Meas. Sci. Technol.

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To solve the measuring problem of the inner shape of large-scale workpieces such as excavators movable arm, this paper proposes an inner shape measurement method based on circular structured light. Firstly, the center of the circular laser stripe is extracted based on a modified Steger method. Secondly, the multi-diameter concentric calibration gauge designed is used to calibrate the optical plane of the proposed system, to reduce the problem of the optical plane deviation and motion error of 1D linear stage in the traditional calibration process. Finally, the experiments are carried out and the corresponding experimental results demonstrate that the proposed measurement method not only allows for fast calibration of the camera, but also for efficient extraction of the center of the light stripe, resulting in a relative error of less than 0.012%. In addition, the measurement method will be further applied to deep-hole workpieces such as steel pipes and natural gas pipelines etc.

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Section: Mathematical Modelmentioning

confidence: 99%

Calibration of a circular structured light measurement system based on a multi-diameter calibrator

Zuo²,

Fan³

et al. 2023

Meas. Sci. Technol.

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show abstract

“…Therefore, the development of novel imaging system calibration methods is required [29]. The multi-ring system effectively reduces the deviations encountered during scanning, eliminating the need for complex light plane calibration [30][31][32]. The calibration coefficients for each ring light are adequate for three-dimensional reconstruction.…”

Section: Introductionmentioning

confidence: 99%

Accuracy improvement of a multi-ring beam structured inner surface measurement: via novel calibration methodology and light source optimization

Li,

Deng,

et al. 2024

Meas. Sci. Technol.

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Parts with a large depth-to-diameter ratio play a critical role in the military, aerospace, and automotive industries. However, accurately measuring their inner surface profile remians challenging owing to the lack of adequate and accurate sensors. We developed a multi-ring structured light system to obtain three-dimensional data of inner contours, such as inner diameters, which are crucial for ensuring component performance and safety. In this study, we proposed three simple yet effective techniques to improve the multi-ring beam structured measurement system. First, we designed a distortion correction method to calibrate the imaging system. Second, a two-step calibration approach was used to calibrate the multi-ring projection. Meanwhile, we benchmarked the effects of different light sources on image speckles. The calibration results demonstrated that the coefficient of determination (R-2) used for line fitting exceeded 0.999. Moreover, the measurement experimental results show that the uncertainty of less than 10 µm and the smallest measurable pipe inner diameter can reach 15 mm, demonstrating that our methods are promising for improving the accuracy of structured light optical sensing systems. This system satisfies the measurement requirements and can be immediately utilized to meet the high demand for inner contour measurements in industrial applications.

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Prediction system of rolling contact fatigue on crossing nose based on support vector regression

et al. 2023

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A Calibration Method of Inner Bore Profile Detecting on Electromagnetic Railgun

Cited by 3 publications

References 16 publications

Calibration of a circular structured light measurement system based on a multi-diameter calibrator

Calibration of a circular structured light measurement system based on a multi-diameter calibrator

Accuracy improvement of a multi-ring beam structured inner surface measurement: via novel calibration methodology and light source optimization

Prediction system of rolling contact fatigue on crossing nose based on support vector regression

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