Method of determining the volumetric proportion of liquid...

Details Method of determining the volumetric proportion of liquid... Method of determining the volumetric proportion of liquid...

G - Physics

01

N

G01N 27/22 (2006.01) G01W 1/14 (2006.01)

Patent

CA 2310020

The invention relates to a method for determining the volumetric proportion of liquid water and the density of snow, and to a device for carrying out said method. The inventive method is designed in such a way that interference can be excluded by the measuring system itself. A probe consisting of at least three electric conductors (1, 2) which are arranged parallel to and at different distances from each other is positioned before snowfall or placed in snow which has already fallen (3). Two of the conductors are subjected to the action of an electromagnetic signal with a frequency for which the dielectricity coefficients of water and ice are known and the dielectricity coefficient of the snow is then determined with an inevitable air gap around the probe, based on the transmission behaviour of the electromagnetic signal.

L'invention concerne un procédé pour la détermination de la teneur volumétrique en eau liquide et de la densité de la neige, réalisé de telle façon que des perturbations peuvent être exclues par le système de mesure lui-même. A cet effet, on installe, avant la chute de neige, une sonde composée d'au moins trois conducteurs électriques (1, 2) parallèles entre eux et situés à des distances différentes les uns des autres ou bien on met en place la sonde dans la neige déjà tombée (3). On sollicite deux des conducteurs au moyen d'un signal électromagnétique à une fréquence pour laquelle on connaît les constantes diélectriques de l'eau et de la glace. Puis, on détermine la constante diélectrique de la neige, avec un entrefer inévitable autour de la sonde, à partir du comportement de transmission du signal électromagnétique.

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