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Measurement method for capacitive sensors for microcontrollers based on a phase shifter

Abstrakt

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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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
MEASUREMENT nr 192,
ISSN: 0263-2241
Język:
angielski
Rok wydania:
2022
Opis bibliograficzny:
Czaja Z.: Measurement method for capacitive sensors for microcontrollers based on a phase shifter// MEASUREMENT -Vol. 192, (2022), s.110890-
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.measurement.2022.110890
Źródła finansowania:
  • COST_FREE
Weryfikacja:
Politechnika Gdańska

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