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A Linear Differential Inductive Displacement Sensor with Dual Planar Coils
K. R. Sandra, A. S. Anil Kumar, , V. Jagadeesh Kumar
Published in Institute of Electrical and Electronics Engineers Inc.
2019
Volume: 19
   
Issue: 2
Pages: 457 - 464
Abstract
A non-contact displacement sensor employing a couple of planar coils etched on printed circuit boards (PCBs) and an E-Type soft ferromagnetic core is proposed here. The E-Type soft ferromagnetic core moves over two triangular shaped spiral coils etched on a couple of PCBs. The variation in the inductances of the two coils has a cubic polynomial relationship with the displacement of the core. An appropriate signal conditioning technique operates on the inductances and provides an output that varies linearly with the displacement. The symmetrical structure of the sensor provides negligible cross axis sensitivity. Simulation studies and results obtained from a prototype sensor having a 70-mm range and a resolution of 2μm , built and tested, establish the efficacy of the proposed technique. The worst-case nonlinearity observed from the prototype is 0.4%. © 2001-2012 IEEE.
About the journal
JournalData powered by TypesetIEEE Sensors Journal
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN1530437X
Open AccessNo
Concepts (13)
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    Ferromagnetic materials
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    Ferromagnetism
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    Inductance
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    Printed circuit boards
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    Cross-axis sensitivity
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    Displacement sensor
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    INDUCTIVE DISPLACEMENT SENSORS
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    NON- CONTACT SENSORS
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    PLANAR COIL
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    Printed circuit boards (pcb)
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    RATIO-METRIC OUTPUT
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    SYMMETRICAL STRUCTURE
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    INDUCTIVE SENSORS