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學術出版;;Publications

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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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    Illuminance and Starting Distance of the Far Field of LED-Array Luminaire Operated at Short Working Distance
    (2020-05-01)
    Sun, Ching-Cherng
    ;
    Lin, Yi-Syuan
    ;
    Yang, Tsung-Hsun
    ;
    Lin, Shih-Kang
    ;
    Lee, Xuan-Hao
    A luminaire with a light-emitting diode (LED) array can provide hotspot illumination in a short range. Therefore, a design of a luminaire with the largest central illuminance (LCI) and a high uniformity is warranted. In this paper, we present a study of illuminance variation with respect to the distance of an illumination target of a luminaire with LED array. The emission property of the luminous intensity is characterized by the cosine power law or the divergent angle of full width at half maximum (FWHM). A real LED module is designed to create the simulation for different luminaire types. The occurrence of the LCI and the far-field region are observed. Our results demonstrate that the LCI distance remains shorter than the starting distance of the far field (SDFF). To simplify the simulation, we propose the replacement of the real LED module with a point or flat-extended source. Such light sources must be equipped with the specific cosine power factor corresponding to the divergent angle of the FWHM of the LED module. These light sources are acceptable for describing illumination characteristics, including the SDFF. Our results may facilitate the design of LED-array luminaires operated at short working distances, such as reading lighting or illumination in microscopes.
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    全像術成像系統與非對稱菲涅爾鏡片的光學設計平台之研發(I)
    (2004)
    陳志隆
    ;
    CHERN JYH-LONG
    ;
    交通大學光電工程研究所
    這個計畫有兩個課題，一在發展全像術成像的設計平台，可以進行最佳化與公差容忍度分析，委外製作全像片，再加以實驗驗證，以確認設計平台的可信度。另一個研發課題是發展非對稱菲涅爾鏡片(hybrid Fresnel lens)的設計平台，可以進行最佳化與公差容忍度分析，並委外製作鏡片，再加以實驗驗證，以確認設計平台的可信度。
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    Design of a dual-f-number illumination system and its application to DMD (TM) projection displays
    (2006-09-01)
    Cheng, Chu-Ming
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    A dual-f/# optical system is evaluated and considered for illumination. Etendue theory has been employed to increase the optical throughput and collection efficiency. A classical Cooke triplet with a dual f/# is included for illustration. As a demonstration of the potential application to projection displays, an elliptically shaped illumination-pupil system is proposed to increase the optical collection efficiency in the DMD(TM) (Digital Micromirror Device(TM))-based projection system. With a dual-f/# configuration, this design can eliminate the f/2.4 constraint that was caused by the light-steering action of the narrow +/- 12 degrees tilt angles on the DMD(TM). The percentage of increase in the optical collection efficiency is 6.2% in the dual f/2.0 x f/2.4 optical projection system by using ray-tracing simulation. This method enables a lower than f/2.4 optical design with a high brightness and an adequate contrast ratio in the DMD(TM)-based projectors.