G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 25/04 (2006.01) G01W 1/00 (2006.01) G08B 19/02 (2006.01)
Patent
CA 2053328
A moisture sensor with two heatable concentric moisture electrodes and a temperature sensor detecting the electrode temperature is set into the roadway surface to be monitored. The moisture electrodes are heated by a heating current circuit. The heating current circuit is connected to a computer which has a store for storing device-specific parameters, desired values and a processing programme. During each measuring cycle the computer processes the temperatures of the moisture electrodes measured by the temperature sensor and a signal which is representative of the surface moisture. A control signal is produced therefrom which heats the moisture electrodes. An alarm or switching signal is produced when the moisture electrodes have reached a temperature characteristic of the formation of ice and a conductivity indicative of moisture is present between the moisture electrodes.
Freundlieb Helmut
Latarius Hans
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Tekmar Angewandte Elektronik Gmbh
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