Displacement sensing system

Details Displacement sensing system Displacement sensing system

2005-08-23

2005-08-23

Lee, Benjamin C. (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S547000, C340S551000, C340S686200, C340S686600, C324S207110

Reexamination Certificate

active

06933846

ABSTRACT:
A displacement sensing system including an oscillator circuit having a characteristic frequency which varies as a function of a magnetic field in the vicinity thereof, an element whose position relative to the oscillator circuit is varied by a displacement, the element being operative to vary the magnetic field in the vicinity of the oscillator circuit as a function of the displacement and circuitry for sensing a change of frequency of the oscillator circuit over time (delta f/delta t) and for providing an output indication when the change in frequency of the oscillator circuit over time exceeds a threshold.

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