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How to measure contactlessly position of a spinning miniature cylindrical magnet?

April 26, 2017cylindrical magnet measure miniature position SPINNING

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How to measure contactlessly position of a spinning miniature cylindrical magnet?

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Hello, We are seeking a solution to monitor contactlessly (up to 10-15mm or more if possible) the position of a small cylindrical rotor (diameter 1.6 mm, length 2 to 4mm) diametrically magnetized spinning up to 300 Hz. The solution must not be too sensitive to misalignment of rotor and sensor (e.g. up to +/-45). All propositions and comments are welcome. Thanks.