Multilayer planar inductor array based angular position sensor for cryogenic application |
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Affiliation: | 1. New York University School of Medicine, New York, NY, United States;2. Mt Sinai Beth Israel Medical Center, New York, NY, United States;3. Brigham and Women''s Hospital Heart & Vascular Center and Harvard Medical School, Boston, MA, United States;1. CNR – Institute of Clinical Physiology, Pisa, Italy;2. Scuola Superiore Sant''Anna, Pisa, Italy |
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Abstract: | The design, development and testing of a cryogenically operated multilayer planar inductor array based eddy current angular position/rotation transducer is claimed. An array of 4 multi-layered coils is used to divide the 360° into four sectors of 90° each. Switching between each of the inductor is done by a cold electronics based multiplexer circuit coupled to an unbuffered inverter LC oscillator. The angular displacement is a function of frequency of cold electronic LC oscillator. The pickup coil forms the inductor of the oscillator which is operated down to 4.2 K and uses thermal cycled stable components. The change in frequency as a function of angular displacement was calibrated at cryogenic temperatures. The developed sensor was found to have good thermal stability, sensitivity and repeatability over the entire cryogenic range. |
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Keywords: | Multilayer inductor array Eddy current Multiplexed LC oscillator Cold electronics Angular displacement Cryogenics |
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