A design is presented for a compact capacitive position sensor suitable for operation at cryogenic temperatures and high magnetic fields. The four quadrants of a base electrode are excited with phases differing by 90°; from its in- and out-of-phase components, the current injected into the movable electrode yields simultaneous information about the x and y sensor positions. This current is also linear in the position of the sensor. The effects of possible sensor imperfections are analyzed in detail.
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Field et al. (2000) studied this question.
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