Capacitive Proximity Sensor Maximum Range Dependence on Geometry and Size
2020 IEEE 8th Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE 2020) 2021
Ričards Poriņš, Pēteris Apse-Apsītis

In this research paper, the method for evaluating detectable range of the capacitive proximity sensor depending on the sensor geometry, surface area, and plate separation distance is presented. In experiments, three shapes were used - square, rectangle, and circle. For each shape, multiple measurements were made, while keeping the surface area and separation distance of the shapes equal. The basis for capacitance measurement was a resonance frequency of the LC circuit with a high-speed comparator to convert AC signal to DC square signal - as a result, it is a capacitance-frequency converter. From measured frequency, the capacitance can be calculated if other parameters (permittivity of dielectric, surface area, separation distance of sensor plates) are known. To gather necessary data the capacitance was also measured with an LCR meter and the permittivity of dielectric material was calculated. As a result of the measurements, the most optimal shape, surface area, and separation distance of sensor plates were selected while keeping detectable distance as the main consideration.


Keywords
capacitance , capacitance measurement , proximity effects , distance measurement , sensor systems , frequency measurement , dielectric measurement
DOI
10.1109/AIEEE51419.2021.9435768
Hyperlink
https://ieeexplore.ieee.org/document/9435768

Poriņš, R., Apse-Apsītis, P. Capacitive Proximity Sensor Maximum Range Dependence on Geometry and Size. In: 2020 IEEE 8th Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE 2020), Lithuania, Vilnius, 22-24 April, 2021. Piscataway: IEEE, 2021, pp.27-30. ISBN 978-1-6654-3087-6. e-ISBN 978-1-6654-2538-4. e-ISSN 2689-7342. Available from: doi:10.1109/AIEEE51419.2021.9435768

Publication language
English (en)
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