Apparatus for determining the average water film thickness of ro

Details Apparatus for determining the average water film thickness of ro Apparatus for determining the average water film thickness of ro

1990-12-06

1992-04-14

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324643, 324640, 324630, G01R 2704

Patent

active

051051575

ABSTRACT:
A system for determining the average water film thickness on surfaces, and in particular roadways, with the reflection of microwaves on the surface of the film of water being measured. To be able to easily measure water film thicknesses of several millimeters without contact and with great accuracy, the system includes at least two partial systems which each comprise a signal source and a receiver. The individual partial systems operate at different frequencies which are selected such that the maximum accuracy measuring regions associated with the respective frequencies are contiguous and cover the predetermined water film thickness range to be determined. The partial systems are connected with a sampling and control device which activates at least that partial system which exhibits maximum measuring accuracy for the respective water film thickness being measured and utilizes only the output signal from the receiver of that partial system for the measurement.

REFERENCES:
patent: 2640190 (1953-05-01), Rines
patent: 4052666 (1977-10-01), Fletcher
patent: 4075555 (1978-02-01), Wight
patent: 4492915 (1985-01-01), Caspers
patent: 4623835 (1986-11-01), Mehdizadeh
patent: 4690553 (1987-09-01), Fukamizu et al.
patent: 4789820 (1988-12-01), Parrent
patent: 4818930 (1989-04-01), Flemming
H. Scharsching, "Beruhrungslose Feststellung der Fahrbahnnasse und Anwendung fur Verkehrsbeeinflussungsanlagen", (Non-contacting Determination of the Wetness of a Roadway and Use for Traffic Control Systems), Vienna, 1986.

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