Inductive sensory apparatus
OwnerG. Burnell Hohlinventor
Life of this patent
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Abstract
An inductive sensory system generally includes a sense inductor, a reference sense inductor, an oscillator, a feedback control loop, and a comparator. The oscillator is connectable to both the sense inductor and the reference sense inductor. Upon the oscillator being connected to the reference sense inductor, the feedback control loop establishes a fixed reference level. Upon the sense inductor being connected to the oscillator, the comparator compares the state of the sense inductor against a threshold that is derived from the fixed reference level to determine the change in inductance of the sense inductor.
Claims20
An inductive sensory system for identifying or detecting a conductive object or a conductively coded object, said inductive sensory system comprising:
- a first sense inductor;
- a second sense inductor used as a reference;
- an oscillator connectable to said first sense inductor and to said second sense inductor;
- and
- a feedback control loop, wherein upon said oscillator being connected to said second sense inductor said feedback control loop establishes a fixed reference level;
- and
- a comparator, wherein upon said oscillator being connected to said first sense inductor, a state of said first sense inductor is compared by said comparator against a threshold derived from said fixed reference level to determine the change in inductance of said first sense inductor.
An inductive sensory system for identifying or detecting a conductive object or a conductively coded object, said inductive sensory system comprising:
- a first sense inductor;
- a second sense inductor used as a reference;
- an oscillator connectable to said first sense inductor and said second sense inductor;
- and
- a comparator, wherein upon said oscillator being connected to each of said first and second sense inductors, a state of said first sense inductor is compared by said comparator against a plurality of thresholds derived from a state established by said second sense inductor to determine the change in inductance in said first sense inductor.
Dependencies are inferred from the claim text.