Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-10-15
1995-05-23
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
219510, 340522, 340602, 364557, 374164, 392338, G08B 1902, H05B 102, G01K 700
Patent
active
054185220
ABSTRACT:
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 program. 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.
REFERENCES:
patent: 3164820 (1965-01-01), Hulett
patent: 3891979 (1975-06-01), Braun et al.
patent: 4656333 (1987-04-01), Murphy
Freundlieb Helmut
Latarius Hans
Mullen Jr. Thomas J.
Peng John K.
Tekmar Angewandte Elektronik GmbH
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