Additive-to-multiplicative moiré fringe transition in simultaneous dual-wavelength interferometry

Cheng, Jinlong; Zuo, Fang; Yang, Zhongming; Ye, Jinfei; Gao, Zhishan; Yuan, Qun

doi:10.1016/j.optlaseng.2021.106561

Cited by 12 publications

(2 citation statements)

References 28 publications

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“…The measurement results are independent of the LTE assumption. The dual-wavelength flow-field deflection diagnostic technology has been successfully applied to measure the particle density in laser-induced and Ar arc plasmas [26][27][28], providing technical support for the diagnosis of MV AC air arcs. We previously studied the spatiotemporal evolution of the temperature in an MV AC air arc using the single-wavelength Moiré deflection technique [29].…”

Section: Introductionmentioning

confidence: 99%

Measurement of medium-voltage AC air arc temperature and particle number density based on dual-wavelength Moiré deflection technology

Zhou,

Yang,

Yuan

et al. 2024

J. Phys. D: Appl. Phys.

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AC air arcs are generated in medium-voltage (MV) power systems under the effect of harsh weather conditions, equipment aging, and high penetration of distributed generation, threatening equipment and public safety. The arc current and temperature are low due to the wide application of arc suppression devices. In this scenario, the MV AC air arc does not satisfy the local thermodynamic equilibrium (LTE) condition. In addition, the repeated arcing and extinguishing processes further complicate the arc discharge mechanism, which bring challenges in the modeling and detection of MV AC air arcs. Experimental methods are a direct and efficient approach to determine the properties of arc plasmas. In this study, a dual-wavelength moiré deflection diagnostic system was established to determine the time evolution of the particle density and radial distribution of the temperature in an MV AC air arc without relying on the LTE assumption. The electron number density and heavy particle number density change transiently during the arc discharge process and change gradient along the radial direction. The heavy particle temperature and electron temperature were then calculated based on the measured particle number density. During the arcing stage, the temperature of the electrons exceeded that of the heavy particles significantly, and the arc deviated from LTE. Finally, the limitations of the traditional single-wavelength moiré deflection method are analyzed. The classic single-wavelength moiré deflection method, while capable of estimating heavy particle temperature in plasma, exhibits a significant error in electron density estimation compared to the dual-wavelength moiré deflection method.

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Section: Introductionmentioning

confidence: 99%

Measurement of medium-voltage AC air arc temperature and particle number density based on dual-wavelength Moiré deflection technology

Zhou,

Yang,

Yuan

et al. 2024

J. Phys. D: Appl. Phys.

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“…[6][7][8][9][10] The DWDH has a large measurement range, so it has aroused the great interest of many researchers in recent years. [11][12][13][14] At present, on the one hand, various kinds of DWDH have been proposed to enhance the imaging speed of the DWDH such as deep learning DWDH [15] and single-shot DWDH. [16][17][18][19][20] On the other hand, various noise suppression methods for DWDH have also been proposed to improve the image quality of DWDH, such as linear programming algorithm, [21,22] total variation regularization, [23] additive synthetic-wavelength, [24] and a third illumination wavelength.…”

Section: Introductionmentioning

confidence: 99%

Possibility to break through limitation of measurement range in dual-wavelength digital holography*

Li¹,

Lei²,

Sun³

et al. 2021

Chinese Phys. B

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By using the beat frequency technique, the dual-wavelength digital holography (DWDH) can greatly increase the measurement range of the system. However, the beat frequency technique has a limitation in measurement range. The measurement range is not larger than a synthetic wavelength. Here, to break through this limitation, we propose a novel DWDH method based on the constrained underdetermined equations, which consists of three parts: (i) prove that the constrained underdetermined equation has a unique integer solution, (ii) design an algorithm to search for the unique integer solution, (iii) introduce a third wavelength into the DWDH system, and design a corresponding algorithm to enhance the anti-noise performance of DWDH. As far as we know, it is the first time that we have discovered that the problem of DWDH can belong in a problem of contained underdetermined equations, and it is also the first time that we have given the mathematical proof for breaking through the limitation of the measurement range. A series of results is shown to test the theory and the corresponding algorithms. More importantly, since the principle of proposed DWDH is based on basic mathematical principles, it can be further extended to various fields, such as dual-wavelength microwave imaging and dual-wavelength coherent diffraction imaging.

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Conjugate complex function coupling strategy of interferometric field: Synthetic-wavelength interferometric fringe extraction in simultaneous dual-wavelength interferometry

Cheng

Chen

et al. 2023

Optics and Lasers in Engineering

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Additive-to-multiplicative moiré fringe transition in simultaneous dual-wavelength interferometry

Cited by 12 publications

References 28 publications

Measurement of medium-voltage AC air arc temperature and particle number density based on dual-wavelength Moiré deflection technology

Measurement of medium-voltage AC air arc temperature and particle number density based on dual-wavelength Moiré deflection technology

Possibility to break through limitation of measurement range in dual-wavelength digital holography*

Conjugate complex function coupling strategy of interferometric field: Synthetic-wavelength interferometric fringe extraction in simultaneous dual-wavelength interferometry

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