Rockwell Automation Technologies Incorporated

Frank J Liao

Xiaofeng Sean Gong

Qiang Jacky Jin

Present techniques provide an inductive proximity sensor having a multi-receiver coil assembly and an evaluator circuit configured to receive a differential signal from the multi-receiver coil assembly to determine the presence of a target. The multi-receiver coil assembly includes two receiver coils in a differential coil arrangement and a transmitter coil configured to emit an electromagnetic field and induce a voltage on each of the receiver coils. The voltage difference between the two receiver coils is transmitted as a differential signal to the evaluator circuit. Targets which approach the inductive proximity sensor disrupt the electromagnetic field and change the induced voltages on each of the receiver coils, thereby changing the differential signal. The evaluator circuit processes the differential signal to determine whether the changes indicate that a target is present.

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Shanghai, China

Frank J Liao