Filament diameter measurement system based on dual diffraction

Yang, Shitong; Chen, Bin; Lin, Bin; Cao, Xiaodan

doi:10.3788/col201513.120501

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Zhao et al used the two point sources projection method to correct the shaking amount of filament and achieve online measurement of filament diameter [15]. Yang et al proposed a novel method of measuring filament diameter based on dual diffraction, which added a grating behind the filament to make full use of its subdivision and amplification characteristics [16]. However, it can only measure filaments in the static state, and the method cannot be applied to dynamic filaments.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the method is only used for the measurement of filaments in static state, and its effectiveness in dynamic measurement is not yet known [17]. In summary, non-contact inspection methods can be broadly divided into these types of photoelectric imaging measurement [10,11], scanning measurement [12,13], projection measurement [14,15] and diffraction measurement method [16,17]. Photoelectric imaging measurement method is greatly affected by light source and detector drift.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a non-contact online inspection method for the appearance diameter uniformity of chemical fiber filaments based on laser diffraction is proposed in this paper. Compared with the existing laser diffraction methods for filaments measurement [16,17], the main advantage of the method proposed in this paper is that it effectively takes into account both the static and dynamic states of chemical fiber filaments. The designed diffraction fringe image processing method is not affected by the uneven brightness distribution of diffraction fringes, so that it not only ensures the high accuracy of the measurement of filaments in the static and dynamic states, but also realizes the stability of the measurement of diffraction fringes in the dynamic state.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Non-contact online inspection method for the appearance diameter uniformity of chemical fiber filaments

Liu,

Gan,

Liao

et al. 2023

Meas. Sci. Technol.

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As chemical fiber filaments diameter variation directly affects spinning quality, spinning condition monitoring becomes more and more important in an intelligent manufacturing environment. Firstly, based on the single-slit Fraunhofer diffraction model and the Babinet principle, the non-contact filaments diffraction model is developed to generate diffraction fringe patterns by irradiating chemical fiber filaments with He-Ne laser. Secondly, for the characteristics of diffraction fringe patterns, a segmentation mask window-based diffraction fringe center of gravity extraction method is proposed, and a zero-phase Butterworth low-pass filter is designed and applied to the diffraction light intensity curves to accurately extract the extreme points positions of the adjacent dark fringe and calculate the diameter information. Finally, the non-contact chemical fiber filaments appearance diameter online inspection experiment platform is built to carry out static and dynamic experiments of filaments. The experimental results show that the maximum absolute value of absolute error is less than 1.1 μm for static measurement and less than 10 μm for dynamic measurement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Non-contact online inspection method for the appearance diameter uniformity of chemical fiber filaments

Liu,

Gan,

Liao

et al. 2023

Meas. Sci. Technol.

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Improving diameter measurement from Fraunhofer diffraction with fringe segment splicing

Zhao

Yang

et al. 2023

Opt. Lett.

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Fraunhofer diffraction is an easy but powerful method for measuring the diameter of a thin filament. In practice, however, the diffraction pattern attainable is always subject to limits imposed by various imperfections in real systems, such as small angle approximation and sensor threshold, thus degrading the measurement resolution. In this Letter, we propose a method of fringe segment splicing for improving the diameter measurement from Fraunhofer diffraction. The fringe segment is chosen from a real diffraction pattern and is used to reproduce an ideal diffraction fringe, where the theoretical estimates give the best approximation to the observations. The problem of diameter measurement is solved in the spatial frequency-domain with an ideal diffraction fringe. Our results show that the relative error in this method is less than 0.1% and is far superior to that of previous methods.

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Improved Accuracy for Measurement of Filament Diameter Based on Image-Based Fitting Method

Zhao

Lin

et al. 2022

Photonics

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Laser diffraction (LD) has many obvious advantages for measuring. However, the measurement accuracy is limited by a number of factors, such as imaging noise, sensor threshold, and fitting methods. In this paper, we present a novel method for measuring filament diameter based on image-based fitting, which maintains more information. Before fitting the diffraction image, image processing is applied to solve the problem of image noise and the non-linear response of the charge-coupled device (CCD). Then, a fitting formula is established based on the distribution of laser intensity on a diffraction image, and the fitted results are solved with the Levenberg–Marquardt (LM) algorithm. Finally, the initial parameters of a fit are obtained by calculation, which speeds up the calculation and improves the accuracy of the fitting. The measurement accuracy of this method is verified by experimental and theoretical analysis. In experiments, the filament diameters of 125 and 125.2 μm are measured with a relative error of approximately 0.12%, Furthermore, the superiority of this method is demonstrated by comparing the measurements with other methods. To verify the stability of the measurements, filament diameters of 110–180 μm are chosen to be measured with a relative standard deviation of less than 0.14%.

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Filament diameter measurement system based on dual diffraction

Cited by 3 publications

References 9 publications

Non-contact online inspection method for the appearance diameter uniformity of chemical fiber filaments

Non-contact online inspection method for the appearance diameter uniformity of chemical fiber filaments

Improving diameter measurement from Fraunhofer diffraction with fringe segment splicing

Improved Accuracy for Measurement of Filament Diameter Based on Image-Based Fitting Method

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