A simplified expression for aspheric surface fitting

Wang, Zhaomin; Qu, Weijuan; Asundi, Anand

doi:10.1016/j.ijleo.2017.02.094

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…2(c)], because it corresponds to the reconstructed intensity in Fourier holography. 27) We confirmed that the four holograms in Fig. 3 can be reconstructed separately by the Fourier transform reconstruction method.…”

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confidence: 67%

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Electron holography for vortex beams

Harada

Shimada

Ono

2020

Appl. Phys. Express

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A combined technology of vortex beam technique and electron holography has been developed. A range about 10 times the diameter of the grating opening was irradiated and two-wave interference between a Bragg diffraction wave as a vortex beam and a transmitted wave from and around a fork-shaped grating was recorded as a hologram. Reconstruction by using the Fourier transform method was simultaneously performed for amplitude and phase distributions. Furthermore, by using a wave aberration function, the amplitude and phase distributions at various propagation positions were reconstructed numerically, resulting in the confirmation of vortex beam twists.

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confidence: 67%

“…Even if we broaden our research target to other fields, only a few examples exist. 27,28) In the present study, fork-shaped gratings were employed for generating vortex beams. 2,3,21,23) Bragg diffraction waves generated by the grating were used as object waves and a transmitted wave around the grating was used as a reference wave.…”

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confidence: 99%

Electron holography for vortex beams

Harada

Shimada

Ono

2020

Appl. Phys. Express

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“…By adjusting the surface type of the aspheric lens, the boundary points of the thermometry target (30 mm away from the optical axis) converge to a point after lens refraction. The meridional section of the aspheric lens surface can be expressed as [17] x = cy 2 1…”

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confidence: 99%

The research on improving the spatial resolution of radiant optical fiber temperature sensor

Yu¹,

Niu²,

Wang³

et al. 2022

Meas. Sci. Technol.

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A method of improving the spatial resolution of radiant optical fiber temperature sensor is proposed in this paper. The front lens of the sensor is designed to limit the diameter of the thermometry target. For the purpose of avoiding limiting the influence of thermometry target diameter on the sensor radiation-light coupling ability, a mathematical model of radiation-light coupling of sensor is established, and the relationship between the radiation-light coupling ability of sensor and the diameter of thermometry target is analyzed. Furthermore, an aspherical lens is applied to reduce the influence of aberration on the diameter of thermometry target. The experimental results show that the deviation between the actual temperature measuring target diameter and the theoretical design value is less than 0.2 mm. The radiation received by the sensor outside the temperature measuring target is less than 10% of its total received radiation. Moreover, when there are radiated light interference outside the temperature measurement target, the temperature measurement error of the sensor is only 0.21% - 2.61%, indicating the proposed method has practical significance in improving the spatial resolution of temperature measurement.

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Best-fitting sphere of aspheric surface based on spherical aberration

Pan

Tang

2020

Opt Rev

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A simplified expression for aspheric surface fitting

Cited by 7 publications

References 10 publications

Electron holography for vortex beams

Electron holography for vortex beams

The research on improving the spatial resolution of radiant optical fiber temperature sensor

Best-fitting sphere of aspheric surface based on spherical aberration

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