Three-Dimensional Shape Measuring for Specular Surface Based on Phase Measuring Deflectometry

Ting, 袁婷 Yuan; Feng, 张峰 Zhang; Xiaoping, 陶小平 Tao; Jinjiang, 付锦江 Fu

doi:10.3788/aos201636.0212004

Cited by 8 publications

(3 citation statements)

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“…Phase Measurement Deflectometer (PMD) 15 and Phase Measuring Profilometry (PMP) 16 are two types of classical structured light measurement techniques. They are employed to achieve precise surface shape detections and measurements.…”

Section: Processing Methods For Point Cloud Modelmentioning

confidence: 99%

A novel method for measuring the width and angle of corrosion in Hall thrusters using three-dimensional point cloud

Zhou,

Wu,

Wang

2024

Measurement and Control

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Hall thrusters are electric propulsion devices that are widely used in modern spaceflight. To obtain the critical corrosion data effectively and accurately during long-life tests of Hall thrusters, this paper proposes an automated corrosion measurement method based on three-dimensional point cloud technology. This method uses binocular structured light scanning method to obtain surface point cloud data. The point cloud topology relationship of these disordered data is also established by KD-tree and radius filtering. The base plane is determined according to the average of the outer circle plane in the discharge chamber, and the original point cloud data is sliced transversely and longitudinally. The point cloud of section data is extracted and the corrosion width data is obtained according to the round hole feature extraction and center of circle calculation. The corrosion angle is calculated according to the angle between the straight line and the normal of the section. The proposed method has been verified and the results show that the overall error accuracy is within 60 μm, which meets the requirements for automatic measurement of Hall thruster corrosion. It is a real and effective method to obtain the critical corrosion data during long-life tests of Hall thrusters.

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Section: Processing Methods For Point Cloud Modelmentioning

confidence: 99%

A novel method for measuring the width and angle of corrosion in Hall thrusters using three-dimensional point cloud

Zhou,

Wu,

Wang

2024

Measurement and Control

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“…The 3D information and normal of the mirror surface are calculated through these two light vectors. Two continuous surface light sources are typically achieved by using two different positions of a single surface light source [3][4][5][6]26] or by two surface light sources with a spectroscope [25]. Figure 1(b) demonstrates the proposed line-planes deflectometry.…”

Section: Line-planes Deflectometrymentioning

confidence: 99%

Line–planes deflectometry

Zhang

2018

Meas. Sci. Technol.

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The key issue in phase measurement deflectometry is the solution of incident light which is used to determine the surface normal. To restore the 3D mirror surface information, line–planes deflectometry is proposed to determine the surface normal from the reflected light and the incident light planes containing incident light. To this end, a point light source is used to replace the continuous surface light source of traditional deflectometry. Accordingly, the incident light is calculated by the intersection of incident light planes which are determined by two or more projected lights of a point light source. Finally, the precise mirror surface is restored through the radial basis function interpolation from the gradient which is transformed from the normal information. To verify the proposed method, a line–planes deflectometry system is developed with two projectors and one camera. The system can be applied for two measurement modes concerning different measurement requirements: the ‘line–plane model’ and the ‘line–planes model’. The ‘line–plane model’ can be inferred with a measurement error of less than 0.25 mm to measure objects with low accuracy and non-connectivity. In contrast, the ‘line–planes model’ can be used to measure objects with high accuracy and good area connectivity, and the measurement error is about 1 µm.

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“…Huang et al [30] presented an iterative method that uses discrete cosine transforms to deal with the integration problem, with an incomplete gradient dataset in a Southwell configuration. Yuan et al [31] presented a method of measuring the absolute height and slope of a specular surface with an incident ray, camera pinhole, and dummy assistant surfaces. Song et al [32] selected a binary shifting strip as a structured light pattern for 3D reconstruction of the specular surface.…”

Section: Introductionmentioning

confidence: 99%

A Calibration Method for System Parameters in Direct Phase Measuring Deflectometry

2019

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Phase measuring deflectometry has been widely studied as a way of obtaining the three-dimensional shape of specular objects. Recently, a new direct phase measuring deflectometry technique has been developed to measure the three-dimensional shape of specular objects that have discontinuous and/or isolated surfaces. However, accurate calibration of the system parameters is an important step in direct phase measuring deflectometry. This paper proposes a new calibration method that uses phase information to obtain the system parameters. Phase data are used to accurately calibrate the relative orientation of two liquid crystal display screens in a camera coordinate system, by generating and displaying horizontal and vertical sinusoidal fringe patterns on the two screens. The results of the experiments with an artificial specular step and a concave mirror showed that the proposed calibration method can build a highly accurate relationship between the absolute phase map and the depth data.

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Three-Dimensional Shape Measuring for Specular Surface Based on Phase Measuring Deflectometry

Cited by 8 publications

References 0 publications

A novel method for measuring the width and angle of corrosion in Hall thrusters using three-dimensional point cloud

A novel method for measuring the width and angle of corrosion in Hall thrusters using three-dimensional point cloud

Line–planes deflectometry

A Calibration Method for System Parameters in Direct Phase Measuring Deflectometry

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