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Issue J. Phys. Phys. Appl.
Volume 19, Number S12, décembre 1958
Page(s) 124 - 128
DOI 10.1051/jphysap:019580019012012400

J. Phys. Phys. Appl. 19, 124-128 (1958)
DOI: 10.1051/jphysap:019580019012012400

Enregistrement continu de la conductibilité ionique de l'air au voisinage du sol

O. Salvador et H. Masson

Laboratoire de Physique Météorologique, Faculté des Sciences de Dakar


Abstract
The method of measurement used is that involving a gas stream. A current of air is made to flow through a cylindrical condenser the outer electrode of which is earthed and the inner electrode successively connected up to the + and - terminals of a battery via a powerful resistance R = 10^11 ohms. The central electrode traps those small ions which are of opposite sign to itself, and this produces a difference in potential at the resistor terminals which is proportional to the magnitude it is required to measure. This voltage is then measured by means of a free-condenser type electrometer. The reading to be registered is obtained in 3 stages, as follows : 1) Positive conductance. - 2) Negative conductance. - 3) Zero marking. This apparatus can be used either as an ion counter or as a conductance indicator, depending upon the velocity of the air flow.


Résumé
La méthode de mesure utilisée est la méthode du courant gazeux. Un courant d'air est envoyé à l'intérieur d'un condensateur cylindrique dont l'armature extérieure est à la terre et l'armature intérieure connectée successivement aux bornes + et - d'une pile à travers une forte résistance R = 10^11 ohms. L'armature centrale capte les petits ions de signe contraire à son propre signe, d'où apparition aux bornes de la résistance R d'une différence de potentiel proportionnelle à la grandeur à mesurer. Cette tension est mesurée au moyen d'un électromètre à condensateur vibrant. L'enregistrement, à pointés, s'effectue en trois temps : 1) Conductibilité positive. - 2) Conductibilité négative. - 3) Marquage du zéro. Selon la vitesse du courant d'air utilisé, l'appareil peut fonctionner soit en compteur d'ions, soit en enregistreur de conductibilité.

PACS
9410 - Physics of the neutral atmosphere.

Key words
air -- terrestrial atmosphere -- electrical conductivity -- meteorological instruments




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