A noise-rejecting current amplifier for surface atmospheric ion flux measurements
- 1 September 1997
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 68 (9) , 3563-3565
- https://doi.org/10.1063/1.1148323
Abstract
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.Keywords
This publication has 2 references indexed in Scilit:
- An antenna electrometer system for atmospheric electrical measurementsReview of Scientific Instruments, 1997
- Global Circuit Response to Seasonal Variations in Global Surface Air TemperatureMonthly Weather Review, 1994