G - Physics – 01 – F
Patent
G - Physics
01
F
73/69, 73/71
G01F 23/26 (2006.01) G01R 27/26 (2006.01)
Patent
CA 1042228
WATER DEPTH MEASURING DEVICE Abstract of the Disclosure A device for use in determining the depth of water accumulating on the surface of a pathway, such as an airport runway or the like. A block of electrically insulative mate- rial is embedded in a pathway with the top surface of the block being substantially flush with the pathway surface and exposed to atmospheric precipitation. A sensor comprising first and second capacitors, each of which has first and second coplanar spaced apart electrodes, is positioned within the block with the electrodes of the first capacitor positioned adjacent to and inclined with respect to the top surface of the block and with the electrodes of the second capacitor being positioned a substantially greater distance from the top surface of the block whereby an accumulation of water on the surface of the block af- fects the dielectric, capacitance and conductance of the first capacitor without substantially affecting the dielectric, capaci- tance and conductance of the second. Time-varying out-of-phase electrical signals are applied to the first electrodes of the capacitors as the input to the sensor. An output circuit com- monly connected to the second electrodes of the aforesaid capaci- tors supplies an electrical output signal relative to electrical ground from the sensor. At least one electrical conductor within the block is connected to electrical ground with a portion there- of exposed to the atmosphere at the top surface of the block. Ac- cumulation of water on the surface of the block affects the ca- pacitance and conductance between the output circuit and elec- trical ground whereby the amplitude of the electrical output signal of the sensor is a function of the depth of water accu- mulating on the surface of the pathway.
259282
Overall Wilson W.
Waldman Jerry R.
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