G - Physics – 01 – N
Patent
G - Physics
01
N
340/139, 324/45
G01N 1/00 (2006.01) G01B 7/06 (2006.01) G01N 27/04 (2006.01) G01N 27/416 (2006.01)
Patent
CA 1257333
(57) Abstract of the Disclosure: The present publication describes a method and an apparatus for determining the covering on a road surface. According to the method, a measurement signal is fed into a pair of electrodes inlaid in the road sur- face and acting as a detector (5), whereby the ratio of the measurement current to the voltage formed across the detector (5) is determined in order to establish the con- ductivity of the covering on the road surface. According to the invention, the signal fed into the detector (5) is a low-voltage and low-frequency symmetric alternating voltage signal, and in the method the electric polarization between the poles, caused by the measurement current, is measured in order to determine the thickness of the covering on the road surface. The apparatus in accord- ance with the invention comprises a switch (3) for opening the conductivity measurement circuit (6) for the, purpose of measurement of the surface signal, a detector polarity reversing circuit (4) for reversing the direction of the measurement current, a surface signal measurement circuit (7) for the measurement of the thickness of the covering on the road surface, as well as an alarm logic (8) arranged to indicate possible freezing of the road on the basis of the voltage values of the conductivity and surface signals.
517702
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Vaisala Oy
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