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Abstract
A complete measurement method dedicated to capacitive sensors has been developed. It includes the development of hardware (an analogue interface circuit for microcontrollers with built-in times/counters and analogue comparators) and software (a measurement procedure and a systematic error calibration (correction) algorithm which is based on a calibration dictionary). The interface circuit consists of a low-pass filter and a phase shifter with a capacitive sensor. A prototype circuit based on a mid-range 8-bit microcontroller has been developed and investigated. We also analysed the relative inaccuracy of a measured capacitance of the sensor and performed experimental research. We obtained the relative errors of capacitance determination < 0.06%, which gives a measurement accuracy < 72 fF for the assumed range of the capacitance (100 pF – 300 pF).
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.measurement.2022.110890
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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MEASUREMENT
no. 192,
ISSN: 0263-2241 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Czaja Z.: Measurement method for capacitive sensors for microcontrollers based on a phase shifter// MEASUREMENT -Vol. 192, (2022), s.110890-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.measurement.2022.110890
- Sources of funding:
-
- COST_FREE
- Verified by:
- Gdańsk University of Technology
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