利用微波测量土水系统环保传感器研究

土水系统的复介电常数受土水系统物理化学性质的影响,通过测量土水系统的复介电常数就可以准确的评估地质环境的变化.本文对测土水系统复介电常数的微波环保传感器做了进一步研究,并且描绘了复介电常数的测量.     

Luminescent properties of Eu~（3＋） doped Gd_2WO_6 and Gd_2（WO_4）_3 nanophosphors prepared via co-precipitation method

Eu3+ doped Gd2WO6 and Gd2(WO4)3 nanophosphors with different concentrations were prepared via a co-precipitation method. The structure and morphology of the nanocrystal samples were characterized by using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The emission spectra and excitation spectra of samples were measured. J-O parameters and quantum efficiencies of Eu3+ 5D0 energy level were calculated, and the concentration quenching of Eu3+ luminescence in different matrixes were studied. The results indicated that effective Eu3+:5D0-7F2 red luminescence could be achieved while excited by 395 nm near-UV light and 465 nm blue light in Gd2WO6 host, which was similar to the familiar Gd2(WO4)3:Eu. Therefore, the Gd2WO6:Eu red phosphors might have a potential application for white LED.     

平果铝厂赤泥堆场堆存能力估计

平果铝厂赤泥堆场堆存能力估计田跃（贵阳铝镁设计研究院５５０００１）１概述平果氧化铝厂赤泥为拜尔法赤泥，堆存采用引进的德国技术。拜尔法赤泥在天然状态下的固结能力比烧结法赤泥差（主要是因水作用），采用我国以往低浓度输送至堆场的拜尔法赤泥，在堆场不能形成自...     

一种新型红外测温传感器的原理与应用

MLX90614系列芯片是一组通用的红外测温芯片。它具有精度高、体积小、输出接口多、使用方便等特点，在多种精密设备装置中都有广泛的应用。文中以MLX90614AA为例介绍其原理及应用方法。     

纯铁中磷的高温内耗研究

采用含有不同含量磷的电子轰击纯铁作样品,经脱碳脱氮后,用低频倒扭摆测量其300—800℃之间的内耗值。结果表明,磷含量在0.007—0.28wt%之间的五根样品,分别于580℃和470℃左右出现两个内耗峰,激活能分别为2.13ev和1.80ev。经高温保温一定时期淬火处理后,这两个峰全部消失。由此看出,580℃左右的峰可能是Fe—p的ss峰,而470℃的峰可能是纯铁的PM峰。
本文还研究了一根含稀土元素铈的铁磷合金的内耗。发现在703℃、601℃和500℃相应出现三个内耗峰。初步认为,它们分别是Fe—Ce的ss峰、Fe—P的ss峰和纯铁的PM峰。     

零脉冲高分辨率磁编码器的研制

编码器在许多应用场合要求每旋转1个周期给出1个零脉冲信号.要满足这一使用要求,在前期增量型高分辨率磁编码器的研究基础上,对具有零脉冲信号输出的磁编码器的结构设计、信号触发磁鼓的试制、磁敏电阻敏感元件制备、电子信号处理的研制过程进行讨论.     

桂林高新区:漓东科技城,现代国际版高新技术产业园区

<正>广西桂林高新区,伴随着风风雨雨迎来了成立20周年喜庆日子。20年来,一批批企业在这里由小到大、由弱变强,展翅飞翔。为谋求高新技术产业更大快速发展,桂林高新区人经过科学筹划和反复论证,在漓东老城区与华     

基于Maxwell软件的齿轮测速传感器的磁路分析

齿轮测速传感器在工业测量和自动控制中有着广泛而重要的应用,其中尤其以磁敏类传感器应用最为广泛.对比于光电类齿轮测速传感器,磁敏测速传感器抗震动,不怕油污,特别适合在恶劣条件的工业现场使用.齿轮的形状和大小强烈的影响传感器检测到的磁通的分布,进而影响到信号的检测,因此测速齿轮可以设计成不同与传动齿轮的非标准齿轮,使得检测信号最大.有限元模拟软件Maxwell在磁场模拟中有着广泛的应用,其界面简单,使用方便,模拟真实.本论文以Maxwell为基础对测速传感器的磁路进行分析,以磁敏感芯片为中心,分析了齿轮的尺寸和形状,永磁磁铁和齿轮之间的气隙,以及永磁磁铁的磁感应强度的大小,分析的结论对实际传感器的设计有较好的指导意义.     

Influences of post-annealing and internal stress on magnetoresistance properties of Ni80Fe20 films

Ni80 Fe20 films with thickness about 54 nm were deposited on K9 glass and thermally oxidized silicon substrates at ambient temperature by electron beam evaporation with deposition rate about 1.8 nm/min. The as-deposited films were annealed at 350, 450 and 570 ℃ respectively for 1 h. After annealing at 570 ℃, the anisotropic magnetoresistance ratio(RAM) of the films is greatly improved. It increases to 3%- 3.5% nearly about three times of that of the as-deposited films. The grain size increases with the annealing temperature and the [111] crystal orientation is obviously enhanced after annealing at temperature above 450 ℃. The internal stress in the films deposited on K9 glass is compressive and the resistance measurement shows that RM∥ is larger than RM⊥ in these films. However, in the films deposited at the same conditions but on oxidized silicon substrates, the internal stress is tensile and RM⊥ is larger than RM∥. The differences of RM∥ and RM⊥ in two series of specimens are discussed.     

扭转型张力转角传感器

综述了各种纱线张力测量传感器的优缺点,发明了一种全新的扭转型张力转角传感器,基于霍尔效应原理和独特的机械结构研制的一种高精度的纱线张力测量传感器.机械结构部分主要以游丝产生回复力,使传感器转轴能准确而平稳地回到起始位置点.