Review of optical measurement techniques for measuring three-dimensional topography of inner-wall-shaped parts

Jiao, Fanwei; Liu, Lei; Cheng, Weisheng; Li, Chen; Zhang, Xiaodong

doi:10.1016/j.measurement.2022.111794

Cited by 19 publications

(10 citation statements)

References 114 publications

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“…Due to the perspective-n-point (PNP) [22][23][24] principle, which is used to solve the coordinates of the light probe, at least several sets of points are required for calculation. 25 In general, the light probe is two-dimensional (i.e., planar). The abutment of PICcamera system is this mode, similar to a flag.…”

Section: Introductionmentioning

confidence: 99%

“…The abutment, which is like a light probe, can measure coordinates within overlapped field-of-views of the multicamera or multiview. Due to the perspective-n-point (PNP) 22 – 24 principle, which is used to solve the coordinates of the light probe, at least several sets of points are required for calculation 25 . In general, the light probe is two-dimensional (i.e., planar).…”

Section: Introductionmentioning

confidence: 99%

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Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Li,

Zhang

2024

Opt. Eng.

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.The fixed denture supported by multiple implants can effectively improve the retention and stability of traditional complete dentures, and greatly improve the masticatory ability and life quality of patients, which has been proven to be a reliable treatment method. However, how to accurately obtain the position and posture of multiple implants while the patient feels comfortable is still one of the main clinical difficulties. We design a four-camera system and propose its corresponding method, which accurately measures the position and posture of stereo probes (note that the stereo probes are finely screwed on the implants, i.e., the coordinate systems of the implants are transferred to the stereo probes). In the calibration, a ChArUco calibration board is introduced and the calibration parameters are derived utilizing the proposed three-stage calibration strategy. In the measurement, the stereo probes are screwed on the implants and captured by the four-camera system. Through Canny/Devernay method, the gauge points on the surface of the stereo probe can be solved. Subsequently, the decoding of the gauge points and stereo probes is achieved by the implementation of the proposed matching and decoding strategy. In addition, to achieve higher accuracy, a refinement approach under multiview for the position and posture of stereo probes is established. The result of the experiments verifies that our system and method have higher accuracy and effectiveness (note that the distance error between the two stereo probes is about 19 μm), which is entirely satisfactory for the application of digital implant impressions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Li,

Zhang

2024

Opt. Eng.

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“…6,15 White-light interferometry and confocal laser scanning microscopy (CLSM) are typical noncontact optical methods for 3D reconstruction of the surface morphology. 22 These white-light and laser-facilitated 3D microscopies have great potential to perform highthroughput screening of Li electrodes with a noncontact mode. Besides characterization tools, the nucleation behavior of metal pitting is challenging to study due to its stochastic behavior.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, 3D reconstruction methods with ion milling/sputtering are intrinsically destructive and time-consuming to remove layers of sample . Sanchez et al used operando OM to study the morphology evolution of the pit and found anisotropic pit expansion in both the in-plane and through-plane directions. , White-light interferometry and confocal laser scanning microscopy (CLSM) are typical noncontact optical methods for 3D reconstruction of the surface morphology . These white-light and laser-facilitated 3D microscopies have great potential to perform high-throughput screening of Li electrodes with a noncontact mode.…”

Section: Introductionmentioning

confidence: 99%

Nucleation of Pitting and Evolution of Stripping on Lithium-Metal Anodes

Zhang,

Ulusel,

Shi

2024

ACS Appl. Mater. Interfaces

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The stripping reaction of lithium (Li) will greatly impact the cyclability and safety of Li-metal batteries. However, Li pits' nucleation and growth, the origin of uneven stripping, are still poorly understood. In this study, we analyze the nucleation mechanism of Li pits and their morphology evolution with a large population and electrode area (>0.45 cm 2 ). We elucidate the dependence of the pit size and density on the current density and overpotential, which are aligned with classical nucleation theory. With a confocal laser scanning microscope, we reveal the preferential stripping on certain crystal grains and a new stripping mode between pure pitting and stripping without pitting. Descriptors like circularity and the aspect ratio (R) of the pit radius to depth are used to quantify the evolution of Li pits in three dimensions. As the pits grow, growth predominates along the through-planedirection, surpassing the expanding rate in the in-plane direction. After analyzing more than 1000 pits at each condition, we validate that the overpotential is inversely related to the pit radius and exponentially related to the rate of nucleation. With this established nucleation−overpotential relationship, we can better understand and predict the evolution of the surface area and roughness of Li electrodes under different stripping conditions. The knowledge and methodology developed in this work will significantly benefit Li-metal batteries' charging/discharging profile design and the assessment of large-scale Li-metal foils.

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“…When measuring the large scene or the inner surface of annular workpieces, a rotating mechanism is commonly employed to splice the captured series of data. [7][8][9][10] However, ensuring precise alignment between the camera's optical center and the rotation axis during mounting proves challenging, thus necessitating calibration to establish the positional correlation between the camera and the rotation axis. [11][12][13] Scholars have dedicated significant efforts to the exploration of calibration techniques for rotary scanning system rotation axis.…”

Section: Introductionmentioning

confidence: 99%

Tool-free axis calibration method for self-rotating three-dimensional vision systems

Liu,

Cao,

Jia

et al. 2023

Opt. Eng.

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Review of optical measurement techniques for measuring three-dimensional topography of inner-wall-shaped parts

Cited by 19 publications

References 114 publications

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Nucleation of Pitting and Evolution of Stripping on Lithium-Metal Anodes

Tool-free axis calibration method for self-rotating three-dimensional vision systems

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