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Machine translation
1. (WO1981001470) APPARATUS AND METHOD FOR DETECTING WET AND ICY CONDITIONS ON THE SURFACE OF A PATHWAY
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/001470    International Application No.:    PCT/US1980/001401
Publication Date: 28.05.1981 International Filing Date: 20.10.1980
IPC:
G01N 27/22 (2006.01), G01R 27/02 (2006.01), G01R 27/26 (2006.01), G08B 19/02 (2006.01)
Applicants:
Inventors:
Priority Data:
94556 15.11.1979 US
Title (EN) APPARATUS AND METHOD FOR DETECTING WET AND ICY CONDITIONS ON THE SURFACE OF A PATHWAY
(FR) PROCEDE ET APPAREIL DE DETECTION DE PRECIPITATION SUR UNE CHAUSSEE
Abstract: front page image
(EN)Detection of wet and icy surface conditions on the surface of a pathway using a block (3) of electrically insulative material embedded in the pathway with its top surface (15) exposed to atmospheric precipitation A sensor electrode (9) is encapsulated in the block (3) and is positioned a predetermined distance beneath the top surface (5) of the block (3) so that an accumulation of atmospheric precipitation on the top surface (5) affects the capacitance and conductance between the sensor electrode (9) and the pathway. Circuitry (23) including a pair of exposed parallel plates (17, 19) detects the presence of impurities such as salt on the top surface (5). Circuitry (21) supplies a time-varying electrical current to the sensor electrode (9) at a frequency at which the apparatus (1) is relatively sensitive to impurities on the block's surface when substantially pure precipitation is present at a frequency at which the apparatus (1) insensitive to impurities when impurities are detected. The presence of precipitation is signalled by a device (45) when the capacitive and conductive losses between the sensor electrode (a) and the pathway indicate such precipitation.
(FR)Detection des conditions de surfaces mouillees et glacees sur la surface d'une chaussee, en utilisant un bloc (3) d'un materiau electriquement isolant noye dans la chaussee, avec sa surface superieure (15) exposee aux precipitations atmospheriques. Une electrode-capteur (9) est encapsulee dans le bloc (3) et est positionnee a une distance predeterminee sous la surface superieure (5) du bloc (3) de telle sorte qu'une accumulation de precipitations atmospheriques sur la surface superieure (5) affecte la capacite et la conductance entre l'electrode-senseur (9) et la chaussee. Un reseau de circuits (23) comprenant une paire de plaques paralleles exposees (17, 19) detecte la presence d'impuretes telles que du sel sur la surface superieure (5). Un reseau de circuits (21) fournit un courant electrique variant dans le temps a une electrode-senseur (9) a une frequence a laquelle l'appareil (1) est relativement sensible aux impuretes sur la surface du bloc lorsqu'une precipitation sensiblement pure est presente a une frequence a laquelle l'appareil (1) est insensible aux impuretes lorsque des impuretes sont detectees. La presence de precipitations est signalee par un dispositif (45) lorsque les pertes de capacite et de conductivite entre l'electrode-senseur (9) et la chaussee indiquent une telle precipitation.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)