GMR sensor device having AC power supply

Details GMR sensor device having AC power supply GMR sensor device having AC power supply

2007-10-29

2010-12-14

Whittington, Kenneth J (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207210, C324S252000

Reexamination Certificate

active

07852070

ABSTRACT:
A highly accurate displacement sensor using GMR elements for detecting displacement of a physical quantity such as angle provides a diminished waveform distortion of output voltage. At least two Wheatstone bridge circuits having a predetermined angular offset are installed, with each bridge circuit including a plurality of GMR elements. Each of the GMR elements has a fixed magnetic layer set to a predetermined magnetization direction. An AC power supply is used, and displacement of a physical quantity, such as a rotational angle, is detected on the basis of AC-modulated outputs from the bridge circuits.

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