基于分流器法和罗氏线圈法的静电放电电流测量一致性研究

本文旨在研究不同测量接入方式对静电放电电流测量的一致性,在分析静电放电电流的测量方法的基础上,着重阐述了分流器法和罗氏线圈法的测量原理,对其静电放电电流的测量进行了比对分析。试验表明：两种方法的静电放电电流测量一致性较好,对提高静电放电的防护性能,研究静电放电电流的精确测量具有重要的实际意义。     

火电厂电除尘高压柜电气仪表检验分析

本文阐述了100MW火力发电厂高压静电除尘器电气测量回路原理，并介绍了具体的检验方法，通过分析提高了电气仪表测量的准确性，对300MW火力发电厂高压静电除尘器电测仪表检验也有一定的参考作用。     

恒流放电法测量超级电容器静电容量的影响因素分析与不确定度评定

静电容量是超级电容器的主要电气参数之一,相关标准中均推荐采用恒流放电法对超级电容器静电容量进行测量。介绍了恒流放电法的测量原理和测量电路,通过实验分析了放电电流、充电电流、初始电压对测量结果的影响,并对静电容量测量不确定度进行了评定。结果表明:放电电流对测量结果有较大影响,静电容量随放电电流的增大而减小;充电电流和初始电压对测量结果的影响影响较小;恒流放电法测量静电容量的相对扩展不确定度为2.2%(k=2)。     

静电传感器在气固两相流参数测量中的应用

利用静电传感器测量固体颗粒的速度是气固两相流参数测量中一种极为重要的应用。静电传感器测速原理主要有互相关法、空间滤波法。文中着重介绍了基于静电传感器的空间滤波法测量固体颗粒速度。该方法试验装置结构简单,实验数据处理是在频域内找到信号的"特征"点,例如信号的峰值点、截止点等。理论和很多实验结果均证明了静电传感器空间滤波颗粒平均速度测量方法的有效性。     

静电消除器的原理及校准方法研究

在电子工业中,电子元器件越来越小型化、集成化,其本身存在静电敏感结构且各种高分子材料越来越被广泛应用,所以静电防护是一个非常重要不可回避的问题.在防静电材料和设施中,以离子风机为代表的静电消除器在工业中的应用越来越普遍,文章围绕静电消除器对其工作原理、校准用仪器及校准方法作简要的分析研究,为静电消除器的校准和工厂的静电...     

电子设备静电防护与分析

本文论述了静电对人类日常生活的影响，详细分析了人体静电的产生条件和产生原理，以及静电对电子设备的危害，讲述了防护静电的具体措施和方法。     

静电电容法测量铝合金阳极氧化膜的厚度

用不锈钢制成0.5cm带有弹簧外套塑管的探头,以静电电容法测量YL12、LD31铝的氧化膜厚度,与X射线荧光法测量作比较.试验结果所得参数值,尽管所用材料不同,工艺不同,而其误差都在一个微米之下. 静电电容法测定铝合金阳极氧化膜,精确、稳定、方便,是一种好的无损测量方法. 静电电容法还可测量导电基体涂覆电解质材料的涂层厚度.     

静电悬浮式电容差分加速度计测量原理与动特性设计

目前,加速度计在惯性导航、大地勘探等领域都已得到了广泛的应用.在深空探测的大背景下,用于测量重力梯度的加速度计必须具有更小量程和更高的分辨率.静电悬浮式电容差分加速度计是可选方案之一.此类加速度计的工作原理与经典的弹簧振子系统相似.研究与检测质量块、伺服控制的静电反馈力和空气阻尼相关的各个参数对系统指标的影响将有助于此类加速度计的设计.首先介绍电容差分式加速度计的结构设计和工作原理,并从理论上比较此类加速度计与经典弹簧振子系统的异同.在此基础上以弹簧振子系统为原型,建立此类加速度计的动力学模型,并以这个动力学模型为对象分析此类加速度计系统的动力学特征,包括其动力学方程、固有频率、阻尼频率、脉冲响应和阶跃响应等.同时分析加速度计机构参数和伺服控制电路参数对系统动力学特征的影响.由于此类加速度计是用于测量空间重力梯度这类慢变信号的,因此还重点分析在低频信号输入时的系统响应特征.     

防静电包装在军事安全方面的应用及影响

通过介绍静电的危害,分析静电带电的原理,引出防静电包装在军事上起到的重要作用,并展望防静电包装的未来。     

静电防护工程的研究与进展

静电放电已成为信息化时代的公害之一,它不仅是危险场所的点火源、引爆源,而且是信息化设备的电磁干扰源。章在论述静电放电危害、静电放电的特点、作用机理和形成静电危害基本条件的同时,报道了我国在静电检测与静电防护工程研究方面的成果与进展,提出了“信号自屏蔽－电荷耦合”测试原理、真实静电感度测试方法、织物电位测试方法和人体静电动态电位测试技术,建立了电火工品静电发火数理模型、“静电危险场所”等级划分标准和分类防护措施、预测静电危害的逻辑关系图和静电防护的一般原则与对策。章介绍了部分实验数据和该领域当前研究的热点问题及发展趋势。     

静电防护工程学与标准化

本文综述了静电防护工程学的诞生背景,介绍了这门新兴学科的研究内容和特点。静电防护工程学是研究静电危害及其防护工程的一门交叉学科,它以电子、石油化工、火炸药、粉体工业、纺织、建材、检测计量、管理等领域的静电防护标准为知识载体。静电防护工程学以静电学和电磁场理论为基础,面对复杂的环境以及各种非理想情况,很多现象在理论上难以解释,所以常常以工程化的方法解决实际问题,所以它属于工程技术学科。它利用标准化的方法,形成了静电防护知识体系、标准体系、产品体系和科学仪器。     

Local Particle Mean Velocity Measurement in Pneumatic Conveying Pipelines Using Electrostatic Sensor Arrays

In this paper, a measurement system for the local mean velocity of pneumatically conveyed particles is proposed and developed. It mainly consists of electrostatic sensor arrays, signal conditioning circuits, and a digital signal processor (DSP)-based data acquisition and processing unit. Electrostatic sensor arrays are used to detect the charge on particles in its sensing zone and further make the local particle mean velocity measurement in conjunction with cross-correlation method. The sampling frequency is determined from theoretical analysis of the bandwidth of electrostatic signal and accuracy of correlation velocity calculation. Experiments are carried out on a belt conveyor and a gravity-fed particle rig to determine the optimized sampling number of the electrostatic signal through analyzing the measurement error of the transit time. The results showed that the more sampling numbers, the higher stability of measurement results. The repeatability of the measurement system is less than ±2.2% and the linearity is better than ±4.9% over the velocity range of 5.50–21.98 m/s. Experiments are also performed on a high-pressure dense-phase pneumatic conveying system of pulverized coal, indicating that the measurement system is capable of achieving local mean velocity measurement of pneumatically conveyed particles with the relative standard deviation less than 5.5%.     

防静电包装材料静电屏蔽性能测试方法

介绍了国内外常用的包装材料静电屏蔽性能测试方法和有关仪器及相关标准,简要分析了各种测试方法的优缺点,提出了静电屏蔽测试中应注意和需要解决的问题.     

GB/T32304《航天电子产品静电防护要求》标准解读与应用浅析

随着电子技术的高速发展,静电损伤已经成为影响航天电子产品质量稳定性和成功率的关键因素之一,静电防护也越来越受到我国航天领域的高度重视.本文分析了当前国内外静电防护系统标准现状,对国家标准GB/T 32304-2015《航天电子产品静电防护要求》内容进行解读并与国际先进标准进行对比分析,最后给出了该标准的应用建议.     

微机械谐振子单端口电容检测方法研究

针对微机械谐振子电容信号难以检测的问题,本文采用基于频域分离的单端口静电激励／电容检测方案,并配合以隔离变压器应用技术。这种检测方式时域连续,除此,单端口检测既简化了谐振器结构,又避免了双端口检测中激励信号与检测信号存在耦合干扰的问题。实验结果表明：所设计的方案可以有效观测到梁的谐振现象并解算出谐振子的振动信息,为下一步实现单端口谐振子的闭环奠定了基础。     

Improving controllable adhesion on both rough and smooth surfaces with a hybrid electrostatic/gecko-like adhesive

This paper describes a novel, controllable adhesive that combines the benefits of electrostatic adhesives with gecko-like directional dry adhesives. When working in combination, the two technologies create a positive feedback cycle whose adhesion, depending on the surface type, is often greater than the sum of its parts. The directional dry adhesive brings the electrostatic adhesive closer to the surface, increasing its effect. Similarly, the electrostatic adhesion helps engage more of the directional dry adhesive fibrillar structures, particularly on rough surfaces. This paper presents the new hybrid adhesive''s manufacturing process and compares its performance to three other adhesive technologies manufactured using a similar process: reinforced PDMS, electrostatic and directional dry adhesion. Tests were performed on a set of ceramic tiles with varying roughness to quantify its effect on shear adhesive force. The relative effectiveness of the hybrid adhesive increases as the surface roughness is increased. Experimental data are also presented for different substrate materials to demonstrate the enhanced performance achieved with the hybrid adhesive. Results show that the hybrid adhesive provides up to 5.1× greater adhesion than the electrostatic adhesive or directional dry adhesive technologies alone.     

美国参与IEC静电防护国际标准化活动的对策与启示

本文对IEC静电防护标准、美国静电防护协会ESDA标准进行了介绍,分析研究了美国参与IEc静电防护国际标准化活动的对策,为我国静电防护标准化工作的开展提供借鉴。     

静电的危害与防静电包装

简述了静电产生的原因,静电积累和放电对敏感产品的危害,介绍了某些电子和军工产品的静电感度。对防静电包装原理进行了较为详细的分析。通过对防静电包装技术现状的分析,作者认为应采取果断措施,强制推行静电防护技术。建议加强对静电危害的测试研究,从理论和实践的结合上,深化对静电危害的认识,并尽快制定相应的技术标准。     

Fluidized Bed Device for Plastic Granules Triboelectrification

The study of the triboelectrification process is the key factor to the successful industrial application of electrostatic separation in the field of plastics recycling. Therefore, the aim of the present work is to evaluate an original device for the laboratory study of this process. The original design of the fluidized bed type triboelectrification device has the following distinctive features: (i) transparent walls to observe the fluidization process and the particles moving in the triboelectrification module; (ii) air distributors with different mesh apertures correlated with granule size; (iii) quick replacement of the triboelectrification Plexiglas chamber with other metallic (aluminium, copper) or nonmetallic chambers (polyvinyl chloride—PVC, polyethylene—PE, and polyethylene terephthalate—PET); (iv) possibility of independent operation, for granule charge measurement or integrated operation, for the electrostatic separation experiments using a free-fall electrostatic separator. The results of charge measurement experiments pointed out the different triboelectric behaviour of two types of granules (polystyrene and low-density polyethylene) in contact with the walls of the device. The electrostatic separation experiments carried out on a binary mixture of mm-size polystyrene/polyethylene granules confirmed the effectiveness of the triboelectrification device.     

Fluidized Bed Device for Plastic Granules Triboelectrification

The study of the triboelectrification process is the key factor to the successful industrial application of electrostatic separation in the field of plastics recycling. Therefore, the aim of the present work is to evaluate an original device for the laboratory study of this process. The original design of the fluidized bed type triboelectrification device has the following distinctive features: (i) transparent walls to observe the fluidization process and the particles moving in the triboelectrification module; (ii) air distributors with different mesh apertures correlated with granule size; (iii) quick replacement of the triboelectrification Plexiglas chamber with other metallic (aluminium, copper) or nonmetallic chambers (polyvinyl chloride—PVC, polyethylene—PE, and polyethylene terephthalate—PET); (iv) possibility of independent operation, for granule charge measurement or integrated operation, for the electrostatic separation experiments using a free-fall electrostatic separator. The results of charge measurement experiments pointed out the different triboelectric behaviour of two types of granules (polystyrene and low-density polyethylene) in contact with the walls of the device. The electrostatic separation experiments carried out on a binary mixture of mm-size polystyrene/polyethylene granules confirmed the effectiveness of the triboelectrification device.