The Optical Design and Simulation of Modular LED Freeform Reflector Dipped Headlight

本文从汽车用前照灯国标gb25991—2010出发,在已知光源属性的前提下,利用rEfCAd设计了适用于高亮度白光lEd的自由曲面反射器,将多套反射系统组合成汽车前照灯,并通过TrACEPrO仿真模拟,分析各测试点、区域的照度值,其设计结果能较好地符合国标对近光的要求。该方法能更充分发挥lEd的优点,提高了光能利用率,且大大优化和节省了设计空间。In this paper,a kind of car Head lamp integrating freeform reflectors for bright white LED is presented.Complying with the National Standard GB25991—2010 and considering light source properties known,at first,the freeform reflector is designed with RefCAD,and then several reflector models are integrated into a car head lamp model.The illumination values of the test points and regions are simulated with Tracepro.The simulation results show that it meets the requirement of low beam-GB.This design takes the advantage of LED,increases the utilization of optical energy,and greatly optimizes and saves the design space.福建省重大科技项目资助(2006H0092

Optimization of LED Array Mode

作为新一代照明光源lEd照明技术已经有了长足的发展,但单颗lEd并不能满足正常的照明需求,想达到所要的照明效果通常采用多个lEd组合。lEd组合有各种形式,利用TrACEPrO对4种lEd平面阵列形式,即:3x3方形阵列、3-6同心圆阵列、阿基米德螺线阵列以及1-8圆形阵列进行了详细的光学分析。在满足照明要求的条件下,通过对比找到一种最优化的设计,发现1-8圆形阵列效果最好,所占面积最小,从而可以减少材料的浪费,进一步提高lEd照明的性价比,为lEd照明的普及提供设计上的借鉴。The lighting technique of LED has experienced substantial progress.However,a single LED cannot meet the demand for the normal lighting.LED combination is usually adopted to achieve the desired lighting effects.The forms of LED combination are varied.A detailed optical analysis on four forms of LED planar array is taken by using Tracepro,which are 3×3 square array,3-6 concentric array,Archimedean spiral array and 1-8 circular array.By the comparison,which find that 1-8 circular array is the best optimal design to reduce the waste of material and further improve the cost performance of LED lighting under the conditions of meeting the lighting requirements.A ref erence can be provided for the popularity of LED lighting.福建省重大科技项目(2006H0092

Light Distribution Design of Automobile Freeform Headlamp Reflector

随着现代汽车车灯设计的发展,传统的车灯配光镜由于其设计繁琐,光能利用率较低,且影响汽车美观等缺点,现已逐渐被自由曲面的车灯产品所替代。从汽车前照近光灯国标gb4599-2007出发,在已知光源属性的前提下,利用rEfCAd和lIgHTTOOlS设计了一款适用于H7卤素灯的自由曲面反射器,经过对各测试点、区域的照度值的分析,较好地符合了gb4599-2007对近光的要求。该方法能够大大缩短车灯设计周期,为未来大功率lEd用于车灯设计提供参考。With the development of the modern automotive headlight,the traditional lens headlamp is now gradually being eliminated,because the design is complicated,inefficiency and the impact of the automotive ap pearance.The freeform reflector becomes the predominant designation.Based on the GB4599-2007 regulation,on this premise of getting the light source properties,a freeform reflector for H7 halogen is designed using RefCAD and LightTools.After analysis of the illumination values for each test point and region,the results show that the illu mination distributions meet requirements of GB4599-2007 regulation for dipped headlight.The method can greatly shorten the headlight design cycle and provide a reference for powerful LED used in headlamp design.福建省重大科技项目(2006H0092

三相原油含水仪

本实用新型涉及一种三相原油含水仪，含有测量管道、射线发生器、射线探测器、计算机等；在测量管道的测量间隙的外壁径向对称位置分别装有射线发生器和射线探测器；射线发生器产生的高、低两种能量的γ射线由射线探测器的闪烁体接收变为两种能量的光信号，闪烁体的光信号输入至光电倍加管，由光电倍加管产生的信号与信号处理电路相联；该含水仪测量精度高、含气率可测至５０％

New Current-mode Curvature-compensated CMOS Bandgap

提出了一种新型的低压带隙基准源,与传统的带隙基准不同,该电路引入了第三个电流,以消除双极型晶体管射基电压的温度非线性项,从而实现曲率补偿。采用0.18μM CMOS工艺进行设计验证,HSPICE仿真结果表明,室温下的输出电压为623 MV,-55~+125℃范围内的温度系数为4.2 PPM/℃,1.0~2.1 V之间的电源调整率为0.9 MV/V。A new sub-1V curvature-compensated CMOS bandgap reference(BGR) circuit is presented.Different from the conventional bandgap reference,a third current is introduced to eliminate the temperature nonlinearity of VEB of parasitic p-n-p bipolar junction transistor in CMOS process.The proposed circuit was designed and simulated in a standard 0.18um CMOS process.The results show that the output reference voltage at 623 mV has a temperature coefficient of 4.2 ppm/℃ from-55 ℃ to +125 ℃,and a line regulation of 0.9 mV/V at 1～2.1 V is achieved.福建省重点科技项目资助(2006H0092

Development of Passive Infrared Detector Applied in Solar Lighting System

【中文摘要】 给出了一种应用于太阳能系列产品的新型人体红外信号探测系统的研制方法,该方法将探测到的人体红外信号进行滤波放大后驱动相应负载工作,同时利用自行研制的芯片IV0201取代LM324组成滤波放大电路并加入IV0103、IV0104两颗智能型电源管理芯片,从而使该系统成功的用在太阳能系列产品,并可满足低成本、高可靠性、低功耗等要求。 【英文摘要】 A method is proposed for developing an innovative infrared human signal detection system applied in solar energy products.It can detect human infrared signals and enlarge them to drive the load efficiently with an infrared signal filter.By the use of a self-developed chip IV0202 to replace LM324,a new amplified-filter circuit is formed and two intelligent power management chips IV0103 and IV0104 are included in the circuit so as to apply the system to solar energy products to satisfy the requirements for lo...福建省重大科技项目资助(2006H0092

HIRFL在束γ实验终端BGO反康谱仪性能

<正> 引言随着兰州重离子加速器的建成出束,将有八个实验终端随之投入使用。其中在束γ终端是一台主要用于核谱学研究的大型设备。它由置于水平面内的六套带BGO反康普顿屏蔽的高纯Ge探测器和一个由十四块BGO六棱柱探测元构成的小型晶体球组成。增加这种六棱柱形状的BGO元个数,便能使小型晶体球很容易地扩建成中型和大型晶体球

气体喷嘴反冲传输技术及在核科学中的应用

气体喷嘴反冲传输技术是继"跑兔"装置之后发展和完善起来的适合于短寿命核素研究的一种快速而有效的在线脱束方法。它能够将短寿命核反应产物传输至远离高辐射区的低本底场所进行收集和测量。该技术已在加速器和反应堆上得到了广泛的应用,是一种研究核反应、核谱学和合成与鉴别新元素、新核素的一种不可缺少的基本实验技术和工具。描述了气嘴系统的结构、基本原理、设计要求以及它的主要特性,特别是对系统的气体动力学机制以及各种参数对系统特性的影响等进行了讨论。最后,综述了它在核物理、核化学以及质谱学等领域的应用情况,并且给出了几个应用的典型例子