scholarly journals Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 663
Author(s):  
Hui Zhang ◽  
Dengfei Liu ◽  
Yinwan Wei ◽  
Hong Wang
Keyword(s):  
Optical System ◽  
Design Method ◽  
Chromatic Dispersion ◽  
Electronic Devices ◽  
Color Temperature ◽  
Freeform Surface ◽  
United Nations Economic Commission ◽  
System A ◽  
Economic Commission ◽  
Key Points

We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.

scholarly journals Reflective Optics Design for an LED High Beam Headlamp of Motorbikes

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Peng Ge ◽  
Xiang Wang ◽  
Yang Li ◽  
Hong Wang
Keyword(s):  
Monte Carlo ◽  
Design Method ◽  
Physical Object ◽  
United Nations Economic Commission ◽  
High Beam ◽  
Light Pattern ◽  
Economic Commission ◽  
Reflective Optics ◽  
Freeform Optics ◽  
Optics Design

We propose a reflective optics design for an LED motorbike high beam lamp. We set the measuring screen as an elliptical zone and divide it into many small lattices and divide the spatial angle of the LED source into many parts and make relationships between them. According to the conservation law of energy and the Snell’s law, the reflector is generated by freeform optics design method. Then the optical system is simulated by Monte Carlo method using ASAP software. Light pattern of simulation could meet the standard. The high beam headlamp is finally fabricated and assembled into a physical object. Experiment results can fully comply with United Nations Economic Commission for Europe (ECE) vehicle regulations R113 revision 2 (Class C).

Research on Reconfigurable High-Speed Serial Bus Used in High-Reliability Embedded Computer

2010 ◽  
Vol 20-23 ◽  
pp. 774-778
Author(s):  
Rui Ding ◽  
Yong Qin Hu ◽  
Wei Gong Zhang ◽  
Bo Yang
Keyword(s):  
Computer System ◽  
High Speed ◽  
Communication Protocol ◽  
High Reliability ◽  
Dynamic Reconfiguration ◽  
System A ◽  
Embedded Computer ◽  
Key Points ◽  
Application Scope

The characteristics and limitations of the buses, which are widely used nowadays, are analyzed in this paper. Because these buses don’t adapt to the high-reliability embedded computer system, a novel bus is proposed which is characterized by its high-reliability. And its capacity is reached through its unique datum’s dynamic reconfiguration mechanism. The basic architecture and communication protocol are presented in this paper. And then the key points during realization of this bus are discussed. Finally, the probably application scope and prospects are indicated.

Otoscopy and Photography

1979 ◽  
Vol 88 (6) ◽  
pp. 771-773 ◽  
Author(s):  
Benjamin Chen ◽  
Terry L. Fry ◽  
Newton D. Fischer
Keyword(s):  
Light Source ◽  
Clinical Application ◽  
Middle Ear ◽  
Optical System ◽  
Strobe Light ◽  
System A ◽  
The Subject ◽  
Ear Canals ◽  
Light Color ◽  
Otoscopic Examination

A new hand-held otoscope photographic system, convenient and suitable for clinical application, is introduced. This instrument allows clear otoscopic examination in stenotic or tortuous ear canals, and photographs the subject in one procedure. The instrument consists of a rodlens optical system, a fiberoptic light source, a camera, and exchangeable speculum and a strobe light. Color photographs of tympanic membranes and middle ear pathology are presented.

Design method of infrared microscope optical system with lower aberration compensation

2021 ◽  
Vol 50 (2) ◽  
pp. 20200153-20200153
Author(s):  
刘智颖 Zhiying Liu ◽  
吕知洋 Zhiyang Lv ◽  
高柳絮 Liuxu Gao
Keyword(s):  
Optical System ◽  
Design Method ◽  
Infrared Microscope

A Design Method of TDOF Controller for Sampled-Data Control System: A Method Using Dynamical Model of Feedback Controller

1999 ◽  
Author(s):  
Mitsuo Hirata ◽  
Akiyo Murase ◽  
Takenori Atsumi ◽  
Kenzo Nonami
Keyword(s):  
Control System ◽  
Design Method ◽  
Feedback Controller ◽  
Dynamical Model ◽  
Sampled Data ◽  
System A ◽  
Data Control ◽  
Sampled Data Control ◽  
Model Transfer ◽  
Two Degree Of Freedom

Abstract It has been proposed the design method of the two-degree-of-freedom (TDOF) controller which use the dynamical model of the feedback controller. In this study, we apply this design method to the sampled-data control system. The TDOF controller is obtained so that the output of the TDOF system follows the output of the model transfer function considering the intersample behaviors.

An Improvement of IED Configuration Tool and Modeling for Transformer Condition Monitoring IED

2014 ◽  
Vol 519-520 ◽  
pp. 1309-1312
Author(s):  
De Wen Wang ◽  
Ru Kun Liu
Keyword(s):  
Condition Monitoring ◽  
Design Method ◽  
Electronic Devices ◽  
Object Oriented ◽  
Description Language ◽  
Control Block ◽  
Iec 61850 ◽  
Modeling Technology ◽  
Data Object ◽  
Intelligent Electronic Devices

This paper analyzes the object-oriented modeling technology of IEC 61850 standard and the modeling steps of condition monitoring intelligent electronic devices (IED). Aiming at the problem of the existing configuration tools poor scalability for the IEC 61850 standard, a new design method of the IED configuration tool is brought up. Information model of transformer condition monitoring IED is established including logical device (LD), logical node (LN), data object (DO), data attribute (DA), dataset and report control block with the method mentioned above, and described with substation configuration description language.

scholarly journals Efficient Design for Integrated Photonic Waveguides with Agile Dispersion

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6651
Author(s):  
Zhaonian Wang ◽  
Jiangbing Du ◽  
Weihong Shen ◽  
Jiacheng Liu ◽  
Zuyuan He
Keyword(s):  
Integrated Circuit ◽  
Frequency Comb ◽  
Design Method ◽  
Chromatic Dispersion ◽  
Nonlinear Effects ◽  
Superior Performance ◽  
Efficient Design ◽  
Linear Dispersion ◽  
Dispersion Engineering ◽  
Low Dispersion

Chromatic dispersion engineering of photonic waveguide is of great importance for Photonic Integrated Circuit in broad applications, including on-chip CD compensation, supercontinuum generation, Kerr-comb generation, micro resonator and mode-locked laser. Linear propagation behavior and nonlinear effects of the light wave can be manipulated by engineering CD, in order to manipulate the temporal shape and frequency spectrum. Therefore, agile shapes of dispersion profiles, including typically wideband flat dispersion, are highly desired among various applications. In this study, we demonstrate a novel method for agile dispersion engineering of integrated photonic waveguide. Based on a horizontal double-slot structure, we obtained agile dispersion shapes, including broadband low dispersion, constant dispersion and slope-maintained linear dispersion. The proposed inverse design method is objectively-motivated and automation-supported. Dispersion in the range of 0–1.5 ps/(nm·km) for 861-nm bandwidth has been achieved, which shows superior performance for broadband low dispersion. Numerical simulation of the Kerr frequency comb was carried out utilizing the obtained dispersion shapes and a comb spectrum for 1068-nm bandwidth with a 20-dB power variation was generated. Significant potential for integrated photonic design automation can be expected.

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