Browsing by Author "Hsiao, Fu-Li"

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A Study of Floating Image System with the Interaction Function
(2017-01-01)
Lin, Wen-Kai
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Chiu, Chien-Chang
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Lin, Bor-Shyh
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Su, Wei-Chia
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Hsiao, Fu-Li
In this study, a Fresnel lens, a half-reflecting mirror and a LCD were used to build up a see-through floating image system. A gesture recognition module was employed to achieve the human-computer interaction function. The designed system, offers a simple and economic architecture for augmented reality (AR) system.
Extraordinary acoustic transmission based on a both-sides-open disk resonator array
(2019-12-01)
Lee, Yi-Lung
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Chang, Mu-Shen
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Wei, Kuang-Hung
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Li, Ting-Kuo
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Ni, Chia-Ying
Extraordinary acoustic transmission (EAT) is investigated numerically and experimentally using a square lattice array (SLA) of both-sides-open disk resonators (BSODRs) in a steel slab immersed in water. Each BSODR comprises a disk resonator sandwiched by two tubes and is formed by sticking three steel plates together, where each plate is perforated with a SLA of holes. The lattice constants of the three plates are the same, but the diameters of the holes in the middle plate are larger than those in the top and bottom plates. The BSODR resonance results in low-frequency EAT, and it is shown that the BSODR's resonant behavior can be predicted using a spring-mass model. The EAT frequency can be reduced significantly by adjusting the diameters of the disk resonator and the tubes without changing their thicknesses. Oblique-incidence transmission shows that the low-frequency EAT is insensitive to the angle of incidence, and vibration of the top and bottom steel plates produces strong Fano-like line shapes in the EAT. Additionally, diffraction of the incident wave causes the steel plates to vibrate, and this excites two minor transmission peaks that correspond to Wood's anomalies. As the disk resonator diameter increases, several eigenmodes that are dominated by the vibrations of the steel plates appear and lead to additional high-frequency EAT peaks; this behavior may suit applications that require robustness against variations in the ambient material properties. This structure provides increased flexibility for control of the EAT effect and can be applied in acoustic filters and sensors. (C) 2019 Author(s).
Three-dimensional/two-dimensional convertible display based on computer-generated holograms and an amplitude-modulated spatial light modulator
(2018-06-01)
Matoba, Osamu
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Lin, Wen-Kai
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Hsiao, Fu-Li
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Huang, Chi-Yen
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Lin, Bor-Shyh
A three-dimensional/two-dimensional (3-D/2-D) convertible display was proposed. The display system offers 2-D images via the traditional display technology and offers 3-D images via the computer-generated hologram (CGH) technology. In this system, 2-D and 3-D images are generated from the same amplitude-modulated spatial light modulator (SLM). In the 2-D display mode, the panel displays an amplitude-modulated image and the 2-D image is projected on a polarization-dependent diffuser (PD) screen. In the 3-D display mode, the SLM panel displays CGHs to generate 3-D images. The zero-order diffraction of the amplitude-type CGH will be blocked by a spatial filter (SF), which is designed by a polarizer. Furthermore, a liquid crystal element was employed to modulate the polarization state of the reconstructed light to let the 3-D image quality not to be reduced by the PD. Finally, the proposed system can offer 2-D and 3-D images both clearly. The system suppresses the zero-order diffraction noise of the amplitude-type CGH system successfully. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)