A noise-rejecting current amplifier for surface atmospheric ion flux measurements

被引：13
|
作者：
Harrison, RG
机构：
[1] Department of Meteorology, University of Reading, Earley Gate, Reading
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 1997年 / 68卷 / 09期
关键词：
D O I：
10.1063/1.1148323
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Large area electrodes are required to determine atmospheric charge fluxes at the earth's surface. These also act as antennas for power line hum, swamping the small atmospheric electric signals. A battery-powered head-amplifier resolving 0.025 pA is described here, which uses active compensation to substantially cancel the interference, allowing the atmospheric charge fluxes to be resolved in the presence of the interference. The overall response is nominally -100 mV/pA, with 30 dB of 50 Hz rejection. The head amplifier can drive a low impedance line. (C) 1997 American Institute of Physics.
引用
收藏
页码：3563 / 3565
页数：3
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