Inductive Sensor with Contactless Interrogation for Conductive Target Detection
The contactless interrogation of an inductive sensor (IS) for conductive target detection is presented. The IS comprises a solenoidal coil of copper wire wrapped around a plastic pipe which is connected to a series capacitor to form an LC circuit resonating at the frequency <i>f</i><s...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-03-01
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| Series: | Proceedings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-3900/97/1/95 |
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| Summary: | The contactless interrogation of an inductive sensor (IS) for conductive target detection is presented. The IS comprises a solenoidal coil of copper wire wrapped around a plastic pipe which is connected to a series capacitor to form an LC circuit resonating at the frequency <i>f</i><sub>r</sub>. A conductive target placed at different positions inside the pipe modifies the inductance of the coil, and in turn, <i>f</i><sub>r</sub>. An external interrogation coil (IC) electromagnetically coupled to the IS allows the <i>f</i><sub>r</sub> to be read through a contactless interrogation technique. The approach has been tested by varying both the position of a lead sphere adopted as the target and the interrogation distance <i>d</i> between the IS and IC. Without the sphere, the LC circuit has <i>f</i><sub>r0</sub> = 2.51 MHz. The target sphere has been detected at up to |<i>x</i>| = 7.5 mm from the center of the IS coil with a frequency variation ∆ <i>f</i><sub>r</sub> = 180 kHz at <i>x</i> = 0. |
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| ISSN: | 2504-3900 |