Nonmechanical and multiview 3D measurement microscope for workpiece with large slope and complex geometry

Qu, Yufu; Hu, Yao-Wei; Zhang, Peng

doi:10.1111/jmi.12752

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Then, we assumed that the coordinate of the LED in space is L i (x i ,y i ,z i ) and the incident angle of the LED is defined asα i . Thereby, the illuminance of the spatial combination LEDs can be calculated by superposition with formula (3) and the irradiance of the X-Z plane can be calculated by formula (8). Firstly, the high contrast lighting is discussed.…”

Section: Parameters Optimal Design Of Led Arraymentioning

confidence: 99%

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Illumination system optimal design for geometry measurement of complex cutting tools in machine vision

Wang

Liu

Zhang

et al. 2022

Int J Adv Manuf Technol

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Precision geometry measurement of the complex cutting tools has a significant impact on the machinability of components in the industry. However, acquisition of high-quality images in machine vision is a challenging problem due to the large slope and complex geometry of the cutting tools. In view of the vital function of illumination, this paper proposed a method of optimal design for the LEDs array. First, the calculation model of irradiance distribution on the measurement plane is established and the properties of the reflected light from the surface of cutting tools is analysed based on the BRDF theory. Then, the optimal parameters are solved through the specific algorithm flow for the LED array design. Finally, a flexible LED light source is fabricated with the optimal parameters for different features of the cutting tools and used in the measurement. The measurement results show that the error of the optimized light source is less than 1%, and compared with the off-the-shelf light, the measurement accuracy is improved by 9.5% on average. Moreover, this method also presents the potential applied in other complex objects.

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Section: Parameters Optimal Design Of Led Arraymentioning

confidence: 99%

“…However, with the gradual diversification of the cutting tools, more complex structures have emerged. Due to the large slope and complex geometry, it is difficult to obtain image features of cutting tools and drill bits by using the general optical measurement system which brings a new challenge for the application of machine vision [7,8].…”

Section: Introductionmentioning

confidence: 99%

Illumination system optimal design for geometry measurement of complex cutting tools in machine vision

Wang

Liu

Zhang

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

Precise measurement of geometric and physical quantities in cutting tools inspection and condition monitoring: A review

WANG,

LIU,

ZHANG

et al. 2024

Chinese Journal of Aeronautics

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Continuous optical zoom microscope with extended depth of field and 3D reconstruction

et al. 2022

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Microscope such as fluorescence microscope, confocal microscope and two-photon microscope plays an important role in life science, laser processing and other fields. However, most microscopes only have discrete zoom rates. In this paper, a continuous optical zoom microscope with extended depth of field and 3D reconstruction is demonstrated for the first time. It consists of a zoom objective lens, a microscope holder, an adjustable three-dimensional object stage, an Abbe condenser and an LED light source. The zoom objective lens is composed of several liquid lenses and solid lenses. By adjusting the applied voltage to the liquid lens, the proposed microscope can achieve a large continuous magnification from 10? to 60?. Moreover, an improved shape from focus (SFF) algorithm and image fusion algorithm are designed for 3D reproduction. Based on the liquid lenses, the axial focusing position can be adjusted to obtain images with different depths, and then the extended depth of field and 3D reconstruction can be realized. Our experimental results demonstrate the feasibility of the proposed microscope. The proposed microscope is expected to be applied in the fields of pathological diagnosis, biological detection, etc.

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Nonmechanical and multiview 3D measurement microscope for workpiece with large slope and complex geometry

Abstract: This article is about a method that combines the multi-view rotation scanning and non-mechanical focus variation by using a liquid lens.

Cited by 3 publications

References 17 publications

Illumination system optimal design for geometry measurement of complex cutting tools in machine vision

Illumination system optimal design for geometry measurement of complex cutting tools in machine vision

Precise measurement of geometric and physical quantities in cutting tools inspection and condition monitoring: A review

Continuous optical zoom microscope with extended depth of field and 3D reconstruction

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