A double-Gerdien instrument for simultaneous bipolar air conductivity measurements on balloon platforms

K. A. Nicoll, R. G. Harrison

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A bipolar air conductivity instrument is described for use with a standard disposable meteorological radiosonde package. It is intended to provide electrical measurements at cloud boundaries, where the ratio of the bipolar air conductivities is affected by the presence of charged particles. The sensors are two identical Gerdien-type electrodes, which, through a voltage decay method, measure positive and negative air conductivities simultaneously. Voltage decay provides a thermally stable approach and a novel low current leakage electrometer switch is described which initiates the decay sequence. The radiosonde supplies power and telemetry, as well as measuring simultaneous meteorological data. A test flight using a tethered balloon determined positive (sigma+) and negative (sigma?) conductivities of sigma+ = 2.77textpm0.2 fS m?1 and sigma? = 2.82textpm0.2 fS m?1, respectively, at 400 m aloft, with sigma+/sigma? = 0.98textpm0.04.
Original languageEnglish
Article number084502
JournalReview of Scientific Instruments
Volume79
Issue number8
DOIs
Publication statusPublished - Aug 2008

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