Calibration of a Chromatic Confocal Microscope for Measuring a Colored Specimen

Yu, Qing; Zhang, Kun; Zhou, Ruilan; Cui, Changcai; Fang, Cheng; Fu, Shiwei; Ye, Ruifang

doi:10.1109/jphot.2018.2875562

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…This system is now working as a research platform for the authors' team. The authors' team has published some relevant work, including a confocal measurement system with expanded vertical measurement range [36], fast chromatic confocal sensor development [37], and image grating development for displacement measurement as an alternative of linear encoders [38]. These in-house developed technologies will be integrated into the prototype presented in this paper.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

A Differential Measurement System for Surface Topography Based on a Modular Design

Fang

Jing-wu

et al. 2020

Applied Sciences

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In this paper, a novel design of a surface topography measurement system is proposed, to address the challenge of accurate measurement in a relatively large area. This system was able to achieve nanometer-scale accuracy in a measurement range of 100 mm × 100 mm. The high accuracy in a relatively large area was achieved by implementing two concepts: (1) A static coordinate system was configured to minimize the Abbe errors. (2) A differential measurement configuration was developed by setting up a confocal sensor and a film interferometry module to separate the motion error. In order to accommodate the differential measurement probes from both sides of the central stage and ensure the system rigidity with balanced supports, separate linear guides were introduced in this system. Therefore, the motion Degree of Freedom (DoF) was analyzed in order to address the challenge of an over-constrained mechanism due to multiple kinematic pairs. An optimal configuration and a quick assembly process were proposed accordingly. The experimental results presented in this paper showed that the proposed modular measurement system was able to achieve 10 nm accuracy in measuring the surface roughness and 100 nm accuracy in measuring the step height in the range of 100 mm × 100 mm. In summary, the novel concept of this study is the build of a high-accuracy system with conventional mechanical components.

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Section: Conclusion and Discussionmentioning

confidence: 99%

A Differential Measurement System for Surface Topography Based on a Modular Design

Fang

Jing-wu

et al. 2020

Applied Sciences

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“…Chromaticity calibration [19] refers to the process of measuring data that needs to be characterized as a color image, forming a certain mapping relationship between the data and color values, and then generating an image according to the mapping relationship. Firstly, the original azimuth gamma data of the imaging well section is extracted and processed by an improved data sampling model (to be elaborated in section IV).…”

Section: Chromaticity Calibrationmentioning

confidence: 99%

An Improved LWD Azimuth Gamma Imaging Model Based on HSI Space

Zhang

Lü³

et al. 2020

IEEE Access

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In recent years, in the process of oil and gas exploration and development, the situation of drilling tools drilling out of the reservoir often occurs. Due to the lack of directional indication, the traditional LWD(Logging While Drilling) natural gamma measurement technology cannot guide drilling tools to return to the reservoir efficiently.In order to solve this problem, this paper improves the traditional radiometric gamma measurement technology and establishes a set of azimuth gamma imaging model. Firstly, the basic imaging model is established based on HSI (Hue, Saturation, Intensity) color space.Then, the study focuses on the design of the gamma data quality control algorithm, which can effectively suppress the original gamma data noise.In addition, the cubic spline interpolation algorithm is selected to support the model to obtain 360° omni-directional gamma data.Finally, the image processing technology based on fast grayscale grouping is applied in this study, which greatly improves the imaging effect.Field application shows that the model runs stably on site, and the azimuth gamma image is well indicative. It can monitor the relative position relationship between the borehole trajectory and the formation, which effectively improves the reservoir encounter rate, and has high application and promotion value.

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“…confocal signal [9,10]. Therefore, an efficient and accurate peak wavelength extraction algorithm is required if CCM is to be used for in-line high-dynamic-range measurement [11,12].…”

Section: Fast and Accurate Mean-shift Vector Based Wavelength Extract...mentioning

confidence: 99%

Fast and accurate mean-shift vector based wavelength extraction for chromatic confocal microscopy

Cheng

Hong

et al. 2019

Meas. Sci. Technol.

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Fast and accurate peak wavelength extraction of chromatic confocal signals is of vital importance for efficient chromatic confocal measurement. Existing peak extraction algorithms do not effectively balance calculation efficiency and extraction accuracy. For example, centroid algorithms have high computational efficiency but low accuracy; model-based fitting algorithms have high extraction accuracy but low calculation efficiency. In this paper, a fast and accurate mean-shift vector based peak wavelength extraction algorithm is proposed. In this algorithm, the initial peak wavelength is preset with a centroid algorithm; then the corresponding mean-shift vector is calculated, after which, a new peak wavelength can be calculated by shifting the peak wavelength along the mean-shift vector. This process is then iteratively carried out until a preset ending condition is met. Our experimental results show that the mean-shift vector based peak extraction algorithm has an accuracy equal to that achieved with Gaussian fitting while the efficiency improves by over 70 times.

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Calibration of a Chromatic Confocal Microscope for Measuring a Colored Specimen

Cited by 6 publications

References 18 publications

A Differential Measurement System for Surface Topography Based on a Modular Design

A Differential Measurement System for Surface Topography Based on a Modular Design

An Improved LWD Azimuth Gamma Imaging Model Based on HSI Space

Fast and accurate mean-shift vector based wavelength extraction for chromatic confocal microscopy

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