High resolution diameter estimation of microthin wires by a novel 3D diffraction model

Vyas, K.; Lolla, Kameswara Rao

doi:10.1117/12.897222

SPIE Proceedings

2011

DOI: 10.1117/12.897222

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High resolution diameter estimation of microthin wires by a novel 3D diffraction model

K. Vyas

Kameswara Rao Lolla

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“…The current research on the diffraction measurement of a filament diameter runs into two directions. One direction is the modification of the filament diffraction formula [5][6][7][8] , and the other involves methods of effective information extraction from the filament diffraction spectrum [9][10][11] . These two directions are both a continuation of the traditional diffraction method.…”

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Filament diameter measurement system based on dual diffraction

et al. 2015

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This Letter proposes a brand-new filament diameter measurement method based on what is called "dual diffraction," in that a grating is added behind the filament to make full use of its subdivision and amplification characteristics. Higher measurement accuracy is achieved by this method compared with the traditional diffraction method. To verify its accuracy, three standard filaments with nominal values of 100.2, 120.1, and 140.8 μm are measured by the dual diffraction method and traditional diffraction method under the same experimental conditions. The relative measurement errors of the new method are less than 0.75%, and its average relative error is reduced by 56% compared with the traditional diffraction method.

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Filament diameter measurement system based on dual diffraction

et al. 2015

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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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High resolution diameter estimation of microthin wires by a novel 3D diffraction model

Cited by 2 publications

References 0 publications

Filament diameter measurement system based on dual diffraction

Filament diameter measurement system based on dual diffraction

Improving diameter measurement from Fraunhofer diffraction with fringe segment splicing

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