Apparatus for including tank circuit with shielded, single turn

Details Apparatus for including tank circuit with shielded, single turn Apparatus for including tank circuit with shielded, single turn

1992-10-15

1997-10-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420716, 32420724, 331 65, G01B 714

Patent

active

056802013

ABSTRACT:
Apparatus for detecting the end of a workpiece as it passes a given point. The output of the apparatus can be used as an input to a display or to a device that controls manufacturing, materials handling or like processes. The apparatus has a sensor comprising a single turn inductive coil that surrounds a point at which it is desired to detect the passage of an end of the workpiece. The coil is connected in parallel with a capacitor to form a tank circuit. An integrated circuit has a variable frequency oscillator that excites the tank circuit at its resonant frequency. The integrated circuit produces an output signal that is proportional to the frequency at which the oscillator is operating. As the end of a workpiece passes through the coil, the inductance of the coil changes, causing a change in the resonant frequency of the tank circuit, a change in the oscillator frequency and a change in the output signal. The output signal can be used as an input to a variety of display and control devices.

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