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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >A differential electrometer for vector electric field measurements on a balloon platform
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A differential electrometer for vector electric field measurements on a balloon platform

机译：差分静电计，用于气球平台上的矢量电场测量

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摘要

Vector measurements of middle atmospheric electric fields are mostly carried out using a double-Langmuir probe technique on platforms like balloons and rockets. High impedances (up to 1013 ohms) and low signal levels (similar to few millivolts) are the factors that are to be considered in the design of an electrometer for one such experiment. Here, we offer a simple circuit concept that invokes an instrumentation amplifier capable of meeting our several needs, namely generating the guard voltage, ultra-high impedance (1015 ohms) input terminals, femtoampere bias current, differencing, gain setting, etc. all in one package. A three-channel differential electrometer was developed based on this concept and flown on a high-altitude balloon platform. Results reveal that the instrument is capable of detecting weak electric field variations at stratospheric altitudes.
机译：对中层大气电场的矢量测量主要使用双朗缪尔探针技术在气球和火箭等平台上进行。高阻抗（高达1013欧姆）和低信号电平（近似于几毫伏）是在一个此类实验的静电计设计中要考虑的因素。在这里，我们提供了一个简单的电路概念，可以调用能够满足我们多种需求的仪表放大器，即生成保护电压，超高阻抗（1015欧姆）输入端子，飞安偏置电流，差分，增益设置等。一包。基于此概念开发了一种三通道差动静电计，并在高空气球平台上飞行。结果表明该仪器能够检测平流层高度的弱电场变化。

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