Proximity sensor device that determines at least one...

Details Proximity sensor device that determines at least one... Proximity sensor device that determines at least one...

2005-09-27

2005-09-27

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S229000, C324S239000

Reexamination Certificate

active

06949925

ABSTRACT:
A sensor device includes the ability to determine part presence and at least one physical characteristic of the part. A drive coil and sense coil are arranged so that a voltage applied across the drive coil causes a response in the sense coil, which is influenced by the presence of the item of interest. In a first mode, a controller determines whether the item is present by determining an amount of coupling between the drive coil and the sense coil, which is indicative of whether a part is present near the sense coil. In a second mode, the controller determines an amount of magnetic flux that is indicative of a thickness of the material. In another mode, constant current applied to the drive coil instigates a voltage across both coils. The amplitude of the sense coil voltage and a phase shift of the sense coil voltage relative to the drive coil voltage provides material thickness information.

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