Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1995-06-07
1997-09-23
Strecker, Gerard R.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324160, 324165, 3242072, 32420721, 324632, G01R 2700, G01B 714, G01P 344
Patent
active
056708866
ABSTRACT:
A method and apparatus for sensing proximity of an object using near-field effects or magnetic effects. The sensor chips are designed to accommodate numerous sensing elements. In the electromagnetic sensor, radio frequency energy is fed to an antenna. The antenna radiates this radio frequency energy to charge the surface of an object. When the position of the object changes, the impedance of the antenna due to near-field effects changes. This impedance change is detected to provide an indication of the object's movement. In the magnetic sensor, the sensing element is placed at a right angle to the sensor electronics to provide a smaller surface area across the diameter of the sensor. The magnet that charges the object to be detected is manufactured as a part of the sensor encapsulant. The sensing device may be packaged to be inserted into a wall to provide a sensor having a leak-free seal.
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Smith, Jr. Marshall E.
Wolff Peter U.
Strecker Gerard R.
Wolf Controls Corporation
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