基于3米法半电波暗室中30MHz到1GHz的辐射骚扰检测的测量不确定度评定

根据GB/T 6113.402-2006的要求,系统地考虑了频率范围为30MHz到1GHz的辐射骚扰检测过程中的不确定度来源,分析影响测量结果的不确定度各个因素,建立测量结果不确定度评定的测量模型,并计算评定了频率范围为30MHz到1GHz的辐射骚扰检测测量结果的不确定度。     

电源端口传导骚扰电压测量不确定度的评定

在家用电器500kHz频率点的电源端口传导骚扰电压测量中，对影响测量结果的不确定度分量进行了分析，并给出了各分量标准不确定度以及测量结果的不确定度评定。     

试验桌对辐射骚扰测量的影响

通过实验研究试验桌对辐射骚扰试验的影响,寻找测试数据差异产生的原因及解决方法。实验结果表明,辐射骚扰测试时应使用介电常数低的测试桌以减小不确定度。该研究对于电磁兼容测试中的辐射骚扰测量具有一定的参考价值和指导意义。     

3米法半电波暗室辐射骚扰测量不确定度评定

文章针对测量不确定度的评定方法进行论述,阐释了3米法半电波暗室内30MHz~1GHz辐射发射测量的不确定度评定方法和步骤,为电磁兼容检测实验室测量不确定度的分析提供了参考。     

150kHz～30MHz显示器传导骚扰测试及其不确定度评定

测量不确定度是电磁兼容测试的重要组成部分,是电磁兼容测试结果固有的一个参数,在一定程度上反映了测试水平的高低、测试设备的先进性和测试人员的技术能力,也影响了试验结果。近年来,国家对认可实验室提出了对测量系统进行不确定度评定的要求,并要求在实际工作中正确理解、掌握测量不确定度的理论知识。因此在试验测量中,必须对测量结果给出可信度分析。GB/T6113.402-2006对无线电骚扰和抗扰度测量不确定度进行了     

电磁兼容辐射骚扰场强测试能力验证的探讨

为减小不同实验室辐射骚扰场强测试结果的差异,保证测试结果的量值统一,研究电磁兼容辐射骚扰场强测试能力验证。从测试方法、测试场地、测试系统、测试人员等方面系统分析测试结果的主要影响因素,提出具体的实施方法,提高测试结果的可靠性。实践证明:该方法有助于主导实验室和参比实验室对电磁兼容辐射骚扰场强测试能力验证活动的顺利实施和执行;同时,可提升电磁兼容检测实验室的检测能力。     

功率吸收钳校准的不确定度分析

功率吸收钳是测量受试设备电源线上辐射骚扰功率的重要设备，在电子和电气设备的电磁兼容性检测领域有着广泛的用途。功率吸收钳插人损耗的准确与否以及校准结果的不确定度与测量结果密切相关。作经过对吸收钳校准方法的分析，探讨了对校准结果不确定度有影响的各个因素，建立了评定校准结果不确定度的数学模型。中对校准结果的不确定度评定方法作了简要介绍。     

阻抗稳定网络关键参数测量结果的不确定度评定

根据GB9254—2008标准的要求,对于电信端口发射出来的共模骚扰进行测量时,需要使用阻抗稳定网络（ ISN）。ISN的4个主要参数为共模阻抗、电压分压系数、纵向转换损耗以及去耦合衰减。对于这4个参数的测量结果,现行标准中尚未给出不确定度评定的过程或结果。因此,根据测量过程,给出了这4个参数的不确定度分量及不确定度评定结果,该测量结果的不确定度可用于电信端口共模骚扰发射测量的不确定度评定。     

电磁辐射骚扰测量的不确定度评定

电磁辐射骚扰测试是电磁兼容中的重要项目,在给出测试结果的同时要求给出测量不确定度。本文分析了1～6GHz电磁辐射骚扰项目的不确定来源,重点对试验桌引入的不确定度要素进行详细评定,最后进行了合成标准不确定度的计算,为电磁兼容实验室的不确定度报告的评定提供了参考。     

电源端口传导骚扰测量不确定度分析与计算

介绍测量不确定度与误差的基本概念及它们之间的异同，并根据JJF1059-1999《测量不确定度评定与表示》，对电源端口传导骚扰测量不确定度进行分析和计算。     

矿井瞬态传导骚扰非接触测量方法研究

以瞬态脉冲电流作为短偶极子的激励源,运用电磁场理论建立短偶极子的瞬态辐射发射模型,确定短偶极子瞬态辐射场与其流过的脉冲电流密切相关,并通过地面实验建立直接接触测量值和非接触测量值之间的转换模型,提出井下瞬态传导骚扰的非接触测量方法。井下实验研究表明:非接触测量方法可以及时捕获开关操作瞬间电力电缆瞬态辐射的时域波形;距离电缆1 cm处脉冲电流辐射的电场强度最高可达到4 V/m,对井下电磁环境影响较大。     

Reproducibility and Uncertainty of Conducted Emission Measurements for Adjustable-Speed Electrical Power Drive Characterization

This paper deals with the estimation of systematic and random contributions that could influence the measurement of conducted emissions by adjustable-speed electrical power drive systems. Aside from the uncertainty due to the measurement chain, the electromagnetic compatibility test arrangement was considered as a possible source of uncertainty since it could compromise both the result reliability and the compliance/noncompliance of a given apparatus. In order to completely identify all the uncertainty components, tests were carried out by varying a number of influencing configuration parameters. Their effects on the measurement results were evaluated for the most common inverter modulation techniques, and the measurement reproducibility was evaluated.     

基于TEM小室的探头校准系统不确定度评定

TEM小室是一个常用的电磁场发生装置,使用TEM小室组建场强探头校准系统,可以对射频电磁场探头进行校准。针对一套300 kHz～100 MHz频段的场强探头校准系统进行分析,以磁场探头为例,给出该频段范围内5个频点校准的不确定度评定结果。该不确定度分析过程考虑了TEM小室内空间波阻抗,以及探头与小室内标准场之间的相互作用等,对于分析电磁场探头的校准过程具有参考意义。     

计算电容屏蔽电极位移测量的不确定度评估

计算电容是电学阻抗单位复现的基准装置,是电容、电感和交流电阻的溯源依据.它是电磁计量领域内除量子电压、量子电阻基准之外准确度最高的装置.计算电容装置实现微小电容值(0.2至0.6 pF)精确测量的关键在于对其屏蔽电极位移的高准确度测量.从计算电容屏蔽电极位移测量的基本原理出发,系统分析了屏蔽电极位移测量结果的影响因素,...     

自适应蒙特卡洛法评定全站仪测距不确定度

全站仪测距精度的校准需要在标准基线场上进行,由于野外环境不可控和气象条件波动剧烈,因此判断全站仪的测量结果的可靠程度具有重要意义。为了解决全站仪测距不确定度评定模型的非线性和输入量强相关等问题,本文首先采用了自适应蒙特卡洛法进行不确定度评定,然后与GUM的不确定度评定结果进行对比,当测距距离为1 176 m时,自适应蒙特卡洛法评定的不确定度结果为2.2 mm,GUM为2.6 mm,结果显示两种不确定度评定方法的测量结果均在合理预期之内,且自适应蒙特卡洛法评定的不确定度置信区间更窄。自适应蒙特卡洛法结合了大量数据样本和自适应优化仿真次数的优势,不仅对全站仪测距过程中的各项误差源引入的不确定度分量评估更为全面,而且在保证了全站仪测距不确定度评定结果准确的同时,相比于蒙特卡洛法节约了70%的样本数量。     

电磁辐射干扰试验的测量不确定度评定

详细地分析了利用吉赫兹横电磁波室进行小体积受试设备(EUT)电磁场抗扰度测试的不确定度。     

Schrödinger wave equation for confinement of photon in a waveguide

In the present work, electromagnetic field confinement in a subwavelength waveguide structure is obtained using concepts of quantum mechanics and uncertainty principle. Semi-macroscopic considerations of field interaction at the dielectric interfaces are used in this work. The modal field profile in the subwavelength waveguide is obtained by considering the photon as a particle in the waveguide having finite probability of tunneling. Thus, uncertainty of position is assigned to it. The momentum uncertainty is calculated from position uncertainty. Schrödinger wave equation for the photon is written by incorporating position-momentum uncertainty. The equation is solved and the field distribution in the waveguide is obtained. The field distribution and power confinement is compared with conventional waveguide theory. They were found in good agreement with each other.     

Uncertainty considerations in AC loss measurement of multifilamentary superconducting wires performed via a pickup coil method

The uncertainty of AC loss measurements for multifilamentary superconducting wires by a pickup coil method is evaluated on the basis of the law of propagation of uncertainty. In this evaluation, the effects of measurement conditions, signal processing, and the division of the AC loss into its components (hysteresis loss and coupling loss) are taken into account as elements of uncertainty. The effect of the measurement conditions is evaluated using theoretical expressions of the two main components. Additionally, the effect of signal processing is considered in accordance with the actual processes of the AC loss measurement using experimental outputs. The main factors that contribute to the uncertainty in the propagation process are discussed. The estimated resultant uncertainties are compared to experimental ones for round robin tests of AC loss measurement of Nb-Ti multifilamentary wires exposed to an alternating transverse magnetic field.     

Electromagnetic field monitoring and control systems: state-of-the-art and work-in-progress

The development of EMF monitoring and control systems unquestionably represents one of the major innovations in the range of methodologies for evaluating, through measurement, the so-called environmental electromagnetic pollution. The interest recently shown by ARPA and municipal and provincial councils for setting up electromagnetic field monitoring and control systems has created significant developments in the field under examination. This paper attempts to provide a complete overview of the technical possibilities provided by electromagnetic field monitoring and control systems in the environment and their possible applications. Equipment currently available and under development is described, as well as the most significant work-in-progress in this sector. In the near future, several monitoring systems will be proposed and set up by municipalities and provinces, or directly by telecommunications companies. For this reason, it is more than ever necessary that agreement be reached at a national level to define a unified methodological and operating approach to enable monitoring data from different sources to be compared.