Abstract
This article develops a fundamental new sensing principle for measuring the position of a moving object. The moving object is equipped with a thin film of high magnetic permeability. A stationary electromagnet and a magnetic sensor are located nearby. As the moving object’s position changes, the coupling between the electromagnet and the magnetic sensor changes, allowing highly accurate measurement of position of the moving object. This new sensing principle will allow remote non-contacting position measurement of moving objects without requiring any electronics or battery on the object. The feasibility of the new measurement system is verified using an experimental piston-cylinder system in which the position of the piston is accurately estimated with an accuracy of approximately 1% of the range of motion. The thin film is inexpensive and lightweight and could enable a new generation of position sensors superior to currently available position measurement technologies.
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