Integrated capacitive transducer
AssigneeASEA Aktiebolag
InventorsMorgan Adolfsson, Sture Goransson, Bertil Hok
Life of this patent
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Abstract
A capacitive transducer indicates the value of a physical quantity to be measured and is constructed with two spaced electrically conducting plates movable relative to one another in response to a mechanical signal representative of the physical quantity to be measured to generate an electrical signal in response thereto with the transducer capacitor being actuated and de-actuated to be respectively responsive and non-responsive to the mechanical signal in accordance with pre-designated time intervals. The electrical signal in accordance with the capacitance of the transducer capacitor is integrated to provide an output signal when the integrated signal exceeds a reference value.
Claims19
A transducer for indicating the value of a physical quantity to be measured, comprising:
- a transducer capacitor having two spaced electrically conducting plates movable relative to one another in response to a mechanical signal representative of the physical quantity to be measured and for generating an electrical signal in response thereto;
- capacitive means for trimming said transducer capacitor;
- means for actuating and de-actuating said transducer capacitor to be respectively responsive and non-responsive to said mechanical signal in accordance with pre-designated time intervals;
- means for integrating an electrical signal in accordance with the capacitance of said transducer capacitor and providing an output signal when the integrated signal exceeds a reference value;
- and
- means for receiving control signals for controlling said means for actuating and for transmitting said output signal
Dependencies are inferred from the claim text.