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Yi-Sha Ku, Po-Yi Chang, Han-Wen Lee, Chun-Wei Lo, Yi-Chang Chen and Chia-Hung Cho
We developed a telecentric 3D measurement system based on the fringe projection technique to measure phases corresponding to the 3D shape of bumps on a surface. A measurement algorithm based on an area scan camera with a flexibly programmable region of i...
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Fatemeh Mohammadi and Jonathan Kofman
The multi-wavelength digital-phase-shifting moiré based on moiré wavelength permits 3D shape measurement of surfaces with geometric discontinuities and multiple spatially-isolated surfaces, using only two or three captured images. This is advantageous in...
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Jiayuan Tao, Yuwei Wang, Bolin Cai and Keyi Wang
Planar targets with known features have been widely used for camera calibration in various vision systems. This paper utilizes phase-shifting wedge grating (PWG) arrays as an active calibration target. Features points are encoded into the carrier phase, ...
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Wen-Jing Zhou, Caifu Zheng and Ting-Chung Poon
We present a simple yet effective method, without the need for any additional recording of intensity maps or tremendous iterative computations, to recover reference-wave intensity resulting from the complex hologram acquired by quadrature phase-shifting ...
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Fuqing Miao, Seokyoung Ahn and Yangjin Kim
In wavelength-tuning interferometry, the surface profile of the optical component is a key evaluation index. However, the systematic errors caused by the coupling error between the higher harmonics and phase shift error are considerable. In this research...
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Suyeon Kim, Junhyung Jeong, Girdhari Chaudhary and Yongchae Jeong
This paper presents a design for a dual-band tunable phase shifter (PS) with independently controllable phase shifting between each operating frequency band. The proposed PS consists of a 3-dB hybrid coupler, in which the coupled and through ports termin...
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José Antonio Gómez-Pedrero, César Albarrán-Diego, María García-Montero, Nuria Garzón and Veronica Gonzalez-Fernandez
Deflectometry is an optical technique for determining properties such as power distribution, wavefront, etc., and measurement of the optical properties of an intraocular lens can provide relevant information for clinicians. The aim of the current study w...
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María García-Montero, Nuria Garzón, Veronica Gonzalez-Fernandez, José Antonio Gómez-Pedrero and César Albarrán-Diego
The aim of this work was to compare an enhanced monofocal (RayOne EMV RAO200E, Rayner) and standard monofocal (RayOne RAO600C Aspheric, Rayner) intraocular lenses (IOLs) for three nominal powers (+10.00 D, +20.00 D and +30.00 D) as a function of the opti...
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Xianfeng Xu, Hao Wang, Hui Sheng, Weilong Luo and Xinwei Wang
A robust approach is designed to evaluate the reference tilt angle (RTA) accurately and efficiently by local Gaussian fitting (LGF) for the distribution of one frequency peak on a spatial spectrum plane (SSP). The novel method proposed can avoid enlargin...
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Shaohui Su, Jiadong Wang and Dongyang Zhang
The current template-matching algorithm can match the target workpiece but cannot give the position and orientation of the irregular workpiece. Aiming at this problem, this paper proposes a template-matching algorithm for irregular workpieces based on th...
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Jie Gao, Yiping Cao, Jin Chen and Xiuzhang Huang
When the measured object is fast moving online, the captured deformed pattern may appear as motion blur, and some phase information will be lost. Therefore, the frame rate has to be improved by adjusting the image acquisition mode of the camera to adapt ...
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Hyeonmin Jeon, Jongsu Kim and Kyoungkuk Yoon
In the case of the electric propulsion system on the vessel, Diode Front End (DFE) rectifiers have been applied for large-sized ships and Active Front End (AFE) rectifiers have been utilized for small and medium-sized ships as a part of the system. In th...
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Peter Wai Ming Tsang, Ting-Chung Poon and Jung-Ping Liu
Optical scanning holography (OSH) is a powerful and effective method for capturing the complex hologram of a three-dimensional (3-D) scene. Such captured complex hologram is called optical scanned hologram. However, reconstructing a focused image from an...
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Alyaa Al-Barrak, Ali Al-Sherbaz, Triantafyllos Kanakis and Robin Crockett
Modern wireless communication systems suffer from phase shifting and, more importantly, from interference caused by multipath propagation. Multipath propagation results in an antenna receiving two or more copies of the signal sequence sent from the same ...
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Wenxi Wang, Zhilin Yang, Renkang Hu, Xugang Hua and Xiuyong Wang
Active control of a stay cable through changing its tension is an effective way to lower the vibration amplitude. In this paper, active tendon control of a stay cable using a giant magnetostrictive actuator (GMA), which can generate axial deformation in ...
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Hao Yan, Yongxiang Xu and Jibin Zou
Three-phase permanent-magnet synchronous motors (PMSMs) are widely used in renewable energy applications such as wind power generation, tidal energy and electric vehicles owing to their merits such as high efficiency, high precision and high reliability....
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