<link rel="stylesheet" href="styles.cf390c6bfbe7555f.css">

學術出版;;Publications

Permanent URI for this communityhdl:11536/1

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.

Browse

Filters

2006 - 2009222010 - 20129

Settings

🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chern, Jyh-Long

Search Results

Now showing 1 - 10 of 31
  • Thumbnail Image
    Item type:Item,
    LEDs on curved ceramic substrate with primary optics for modification of luminous intensity
    (2011-01-01)
    Wei, An-Chi
    ;
    Sze, Jyh-Rou
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    Unlike the conventional LED luminary with a planar substrate and only the forward emission, the proposed LED luminary with a curved ceramic substrate can perform both the forward and the backward emissions. Assembled with the proper primary optics, an illustrated LED bulb has been designed, fabricated and measured. The measured luminous intensity of the LED bulb has shown the backward emission and designed distribution with the beam-angle of 133. To broaden the application areas, such a LED bulb on a curved substrate has been modularized as a streetlight. The measured results of the proposed streetlight have shown that the beam angle of the luminous intensity and the luminaire efficiency are 132 degrees and 86%, respectively. Meanwhile, its luminous characteristics also fit the standard for lighting design of urban roads.
  • Thumbnail Image
    Item type:Item,
    Application of global optimization to design of an aspheric pickup head for multiple wavelengths
    (2006-01-01)
    Tsao, Chao-Hsi
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    An optimization process combining of global optimization algorithm and further optimization treatment is proposed and demonstrated with application to the objective lenses of multiple-wavelength configurations. Based on the optimal variable set of aspheric coefficients obtained by the proposed global optimization strategy, singlet objective lens for different operational configurations, i.e., for CD and DVD, and for DVD and HDDVD, can be deduced.
  • Thumbnail Image
    Item type:Item,
    Design of aspheric lens to collimate and uniform irradiance of a light source with Lambertian angular distribution
    (2006-01-01)
    Cheng, Chieh-Jen
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    A design of aspheric lens is proposed to collimate a light source of Lambertian angular distribution and generate homogenous irradiance. Two numerical solutions were calculated. One used even orders of general aspheres to describe the aspheric surfaces and the performance was evaluated by commercial optical software package Tracepro. Both of high numerical aperture (NA) of 0.79 and good RMS uniformity within 95% of designed area in the second surface of lens could be obtained. The reverse of this lens would be used in focusing and the simulated point spread function (PSF) is almost diffraction-limited. The other fitted both of aspheric surface with radial spline surface and the performance was evaluated by commercial optical software package OSLO. With the radial spline surface representation, the aspheric lens has a higher NA of 0.9; meanwhile, the uniformity was still good enough and PSF is also near diffraction-limited.
  • Thumbnail Image
    Item type:Item,
    Designs for optimizing depth of focus and spot size for UV laser ablation
    (2010-11-01)
    Wei, An-Chi
    ;
    Sze, Jyh-Rou
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    The proposed optical systems are designed for extending the depths of foci (DOF) of UV lasers, which can be exploited in the laser-ablation technologies, such as laser machining and lithography. The designed systems are commonly constructed by an optical module that has at least one aspherical surface. Two configurations of optical module, lens-only and lens-reflector, are presented with the designs of 2-lens and 1-lens-1-reflector demonstrated by commercially optical software. Compared with conventional DOF-enhanced systems, which required the chromatic aberration lenses and the light sources with multiple wavelengths, the proposed designs are adapted to the single-wavelength systems, leading to more economical and efficient systems.
  • Thumbnail Image
    Item type:Item,
    Symmetry property of a generalized Billet's N-split lens
    (2010-10-01)
    Cheng, Chieh-Jen
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    This study examines the diffraction properties of a generalized split N-sector lens originating from Billet's split bi-sector lens. The intensity distributions vary dramatically as the number of split sectors increases, and especially compared with those of the classical Billet's split lens. Nevertheless, the type of lens splitting selected causes the interference pattern of equidistant straight lines in the original Billet's lens to form an N-fold angularly distributed pattern with an angle difference of 2 pi/N. For an odd number of splitting N, there is an additional angle shift of pi/N for the azimuthally distributed patterns of equidistant straight lines. In other words, there are two kinds of symmetry even for simple splitting operations. On the other hand, the peak intensity distribution in the central portion resembles a concentric-circle-like pattern, when N is large as a result of N-beam interference. (C) 2010 Elsevier B.V. All rights reserved.
  • Thumbnail Image
    Item type:Item,
    Equiangular-spiral non-loss bent lightpipe and its applications
    (2006-01-01)
    Chu, Shu-Chun
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    A novel bending lightpipe operation scheme with an arbitrary bent angle without light leakage is illustrated in details. Possible applications to a light-splitting element that could split light flux with specified separation ratio, and a light-mixing element that could mix light fluxes from several ports of entrance without light leakage are also shown with case demonstration.
  • Thumbnail Image
    Item type:Item,
    Polarization-preserving angular shifter
    (2008)
    Cheng, Yi-Kai
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    We propose two types of light pipes, namely wedge and circular forms, the incident direction of light propagation could be rotated as necessary while still preserving beam polarization. We also deduce the basic conditions of these preservations of polarization. Several typical cases of light pipes are analyzed by numerical simulation. As one of the examples, it is verified that a collimated beam with +45 degree linearly polarization can be guided to any pre-settled direction where the ellipse ratio variation in polarization is less than 0. 1%
  • Thumbnail Image
    Item type:Item,
    Design of Circular-shape No-loss Bent Lightpipe with a Novel Transform of Elliptical Form
    (2008)
    Peng, Yi-Wen
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
  • Thumbnail Image
    Item type:Item,
    Symmetry property of a generalized Billet's N-split lens
    (2010-10-01)
    Cheng, Chieh-Jen
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    This study examines the diffraction properties of a generalized split N-sector lens originating from Billet's split bi-sector lens. The intensity distributions vary dramatically as the number of split sectors increases, and especially compared with those of the classical Billet's split lens. Nevertheless, the type of lens splitting selected causes the interference pattern of equidistant straight lines in the original Billet's lens to form an N-fold angularly distributed pattern with an angle difference of 2 pi/N. For an odd number of splitting N, there is an additional angle shift of pi/N for the azimuthally distributed patterns of equidistant straight lines. In other words, there are two kinds of symmetry even for simple splitting operations. On the other hand, the peak intensity distribution in the central portion resembles a concentric-circle-like pattern, when N is large as a result of N-beam interference. (C) 2010 Elsevier B.V. All rights reserved.
  • Thumbnail Image
    Item type:Item,
    Designs for optimizing depth of focus and spot size for UV laser ablation
    (2010-11-01)
    Wei, An-Chi
    ;
    Sze, Jyh-Rou
    ;
    Chern, Jyh-Long
    ;
    光電工程學系
    ;
    Department of Photonics
    The proposed optical systems are designed for extending the depths of foci (DOF) of UV lasers, which can be exploited in the laser-ablation technologies, such as laser machining and lithography. The designed systems are commonly constructed by an optical module that has at least one aspherical surface. Two configurations of optical module, lens-only and lens-reflector, are presented with the designs of 2-lens and 1-lens-1-reflector demonstrated by commercially optical software. Compared with conventional DOF-enhanced systems, which required the chromatic aberration lenses and the light sources with multiple wavelengths, the proposed designs are adapted to the single-wavelength systems, leading to more economical and efficient systems.