Moisture sensor for layers
First Claim
1. A moisture sensor for sensing the moisture in layers, said moisture sensor including a conductor arrangement comprising two parallel electrical cables, a measuring apparatus for determining dielectric coefficients connected to said conductor arrangement, each cable including two spaced conductors connected in a three-conductor circuit, in which the conductors of said two cables disposed adjacent each other are at the same potential the space between the two inner conductors of said cables being selected so as to provide for a certain impedance of said conductor arrangement, said electrical conductors of each cable being surrounded by an insulating material layer of a predetermined thickness and carrying at one side, which is remote from the layer whose dielectric coefficient is to be measured, a metal shielding layer, the space between said inner conductors, the thickness of the insulating material and said metal shielding layer determining the measurement field of the moisture sensor in the layer in which the moisture is to be sensed.
1 Assignment
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Accused Products
Abstract
In a moisture sensor for monitoring the moisture content of layers, at least two parallel electrical conductors connected to a measuring apparatus are disposed adjacent the layers to be monitored. The conductors are surrounded by an insulating material and carry, at their side remote from the layer whose dielectric coefficient is to be monitored, a metal shielding layer for limiting the measurement field of the sensor.
24 Citations
8 Claims
- 1. A moisture sensor for sensing the moisture in layers, said moisture sensor including a conductor arrangement comprising two parallel electrical cables, a measuring apparatus for determining dielectric coefficients connected to said conductor arrangement, each cable including two spaced conductors connected in a three-conductor circuit, in which the conductors of said two cables disposed adjacent each other are at the same potential the space between the two inner conductors of said cables being selected so as to provide for a certain impedance of said conductor arrangement, said electrical conductors of each cable being surrounded by an insulating material layer of a predetermined thickness and carrying at one side, which is remote from the layer whose dielectric coefficient is to be measured, a metal shielding layer, the space between said inner conductors, the thickness of the insulating material and said metal shielding layer determining the measurement field of the moisture sensor in the layer in which the moisture is to be sensed.
Specification