Basic Study of Electrostatic Induced Voltage in a Metal Box Caused by Movement of a Charged Body

放置在半开的金属盒中的电子设备附近的带静电物体（如人体）的移动会导致设备的导电部分出现电压感应。静电感应电压会引起设备的故障甚至故障。本研究的目的是提供防止电子设备故障或失效的指导方针。静电感应电压的测量在这项研究中，实验装置代表了一个带电的人体通过一个部分打开的金属盒附近的情况。并测量了放置在金属盒内的两块面积不同的金属片之间的感应电压。感应电压的测量采用球体间隙和金属盒中的电磁波传感器进行。实验结果表明：(1)金属板间的感应电压随金属板面积的增大而增大，且该电压下的感应电压与金属板接地面积的关系不大。(2)在本实验范围内，当未接地的金属片面积小于0.18cm^2时，感应电压可降至低于电子元件击穿电压。(3)当一侧金属片接地时，受感应电压作用产生两次静电放电，而当两块金属片不接地时，产生多次静电放电。为了测量金属盒内感应电压随时间的变化以及感应电压随球隙产生的电磁噪声，本文采用测量电场强度的方法研究了光学电场传感器的特性。实验结果表明，通过计算转换方程，它可以用作表面静电计或光场传感器，并且电磁噪声的特性随放电电压的值而变化。少

Movement of electrostatic charged objects, such as a human body, near electronic equipment placed in a partly opened metal box can lead to the appearance of voltage induced in conductive parts of the equipment. The electrostatic induced voltage can cause malfunctions and even breakdowns of the equipment. The purpose of this study is to give a guideline for preventing a malfunction or a failure of electronic apparatus.1. Measurement of the electrostatic induced voltageIn this study, the experimental device represented a situation in which a charged human body passes through near a partly opened metal box. And the induced voltage between two metal sheets having different areas placed in the metal box was measured. Measurement of the induced voltage was carried out using a sphere gap and an electromagnetic wave sensor in the metal box. Experimental results indicated that as follows. (1)The induced voltage between two metal sheets become higher when the area of metal sheet increased and th … More at this voltage depended only slightly on the area of grounded metal sheet. (2) Within the limits of this experiment, when the area of an ungrounded metal sheet is smaller than 0.18cm^2, the induced voltage can be reduced to less than the voltage that electronic components are broken. (3) When a metal sheet of one side was grounded, electrostatic discharge by the induced voltage occurred twice, but when two metal sheets were ungrounded, electrostatic discharge occurred many times.2. Measurement of the electromagnetic noise by the electric dischargeIn this study, for the measurement of the change in time of the induced voltage and the electromagnetic noise which was occurred with the sphere gap by the induced voltage in the metal box, the characteristic of an optical electric field sensor was examined by the measurement of the electric field strength. Experimental results indicated that it could be used as a surface electrometer the optical electric field sensor by calculating conversion equation and that the characteristics of the electromagnetic noise are different with value of the electric discharge voltage. Less