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RISS 인기검색어
- 검색키워드
- 저자 : Dewei Gong (검색결과 4 건)
- 무료
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Comparison of the higher diffraction order images in methyl-red-doped liquid crystal films
Dewei Gong,Zhongxiang Zhou,Chunfeng Hou,Yongyuan Jiang,Hao Tian 한국물리학회 2009 Current Applied Physics Vol.9 No.4
We investigate the change of higher diffraction order images in holographic image storage and reconstruction process. In experiments, an s-polarized Ar+ laser (488.0 nm) was used to record permanent grating in the dye-doped liquid crystal, 4,4'-n-entylcyanobiphenyl (5CB) doped with 1 wt% methyl-red (MR), at a small incident angle. Higher diffraction order images were observed when the signal beam was focused in front of and behind the film. Then the film was illuminated by an s-polarized He–Ne laser (632.8 nm) in the direction perpendicular to the surface. The higher diffraction order images were reconstructed. A theory about the change of higher diffraction order images is developed, which is in good agreement with experimental results. The results show that the higher diffraction order provides a useful method for optical information processing. We investigate the change of higher diffraction order images in holographic image storage and reconstruction process. In experiments, an s-polarized Ar+ laser (488.0 nm) was used to record permanent grating in the dye-doped liquid crystal, 4,4'-n-entylcyanobiphenyl (5CB) doped with 1 wt% methyl-red (MR), at a small incident angle. Higher diffraction order images were observed when the signal beam was focused in front of and behind the film. Then the film was illuminated by an s-polarized He–Ne laser (632.8 nm) in the direction perpendicular to the surface. The higher diffraction order images were reconstructed. A theory about the change of higher diffraction order images is developed, which is in good agreement with experimental results. The results show that the higher diffraction order provides a useful method for optical information processing.
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Jahangir Afsharian,Dewei (David) Xu,Ning Zhu,Bing Gong,Zhihua Yang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a modular stacked transformer structure for high-efficiency and high-power LLC resonant converters. Besides the benefits of shrunken footprint and shorten secondary current travelling path that were introduced by the vertically stacked structure, the specific feature of modularity design makes the transformer be simply applied to higher power ratings with high efficiency, high power density and easy fabrication. The design modularity for high power rating extension is demonstrated on a 380 V/12 V 2.4 kW LLC transformer with 4-stack winding PCBs and one core set. Current sharing behavior among all paralleled secondary windings of the proposed stacked structure and its modular design is discussed in terms of the magnetomotive force distribution. The effect of current sharing on winding losses is analyzed and verified using finite element analysis (FEA) simulation. Experimental results show that the LLC converter with the proposed 2.4 kW modular stacked transformer can achieve a peak efficiency of 98.05%.
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Jahangir Afsharian,Dewei (David) Xu,Bing Gong 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper proposes a single-stage isolated matrix rectifier with hold-up time capability and wide input voltage range operation to fulfill the rigorous quality and reliability requirement for data center and telecom applications. By employing an auxiliary circuitry to charge the hold-up time capacitor and varying the transformer-turns-ratio to increase the gain of the converter, 20 ms holdup time is admissible. As a second benefit of varying transformer-turns-ratio, the attainable maximum gain of the converter enables wide input voltage range operation of matrix rectifier without degrading the efficiency and power density of main converter significantly. The simulation and experimental are conducted on 54 V output and 5 kW rated output power prototype to verify 20 ms hold-up time and wide input range operation of matrix rectifier.
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Diffraction behavior of an azo-dye-doped nematic liquid crystal without applied electric field
Hongyue Gao,Kaiyu Gu,Zhongxiang Zhou,Yongyuan Jiang,Dewei Gong 한국물리학회 2008 Current Applied Physics Vol.8 No.1
We investigate the dependence of the two-beam coupling diffraction efficiency on the experimental parameters, and hence achieve the optimum experimental conditions for holographic recording in planar Methyl Red-doped nematic liquid crystal film without external electric field. Under the optimum experimental conditions, the diffraction efficiency of a holographic grating is improved to 21.4%, and holographic image with long-term stability is stored in the film. These results provide an experimental basis for holographic data storage in this liquid crystal film We investigate the dependence of the two-beam coupling diffraction efficiency on the experimental parameters, and hence achieve the optimum experimental conditions for holographic recording in planar Methyl Red-doped nematic liquid crystal film without external electric field. Under the optimum experimental conditions, the diffraction efficiency of a holographic grating is improved to 21.4%, and holographic image with long-term stability is stored in the film. These results provide an experimental basis for holographic data storage in this liquid crystal film
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