A microcontroller-based self-calibration technique for a smart capacitive angular-position sensor

Li, X.; Meijer, G.C.M.; Jong, G.W. de

doi:10.1109/19.650794

Cited by 39 publications

(21 citation statements)

References 11 publications

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“…For the multiplicative and offset calibrations of the inaccuracy caused by geometrical errors and pattern error of electrodes, only two simple linear fit formulas and seven correction data are required. Experimental results show that this selfcalibration is relatively effective in reducing the inaccuracy caused by the geometrical errors and pattern errors of the sensor [76].…”

Section: Calibration Of the Sensormentioning

confidence: 87%

Environmental Monitoring Systems: A Review

2013

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Section: Calibration Of the Sensormentioning

confidence: 87%

Environmental Monitoring Systems: A Review

2013

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“…The opposite case happens when the rotor approaches to the common electrode. The equivalent capacitance is given now by (9) which can be arranged as (10) Equation (10) can also be obtained by considering a conductor as a dielectric material with infinite and substituting it in (5). The maximum value ( 1) is now higher than that obtained in the dielectric case, so there is a higher sensitivity to the rotor movement.…”

Section: B Circuit Model Of the Sensormentioning

confidence: 99%

A contactless capacitive angular-position sensor

Gasulla¹,

Meijer

et al. 2003

IEEE Sensors J.

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This paper presents an absolute capacitive angular-position sensor with a contactless rotor. The sensor is mainly composed of three parts: the capacitive sensing element, a signal processor, and a microcontroller. The electrically floating rotor can be either conductive or dielectric. For the dielectric material, we chose plastic, and for the conductive rotor, we chose aluminum. The sensing element has a redundant structure, which reduces mechanical nonidealities. The signal processor has a multicapacitance input and a single output, which is a period-modulated square-wave voltage. The microcontroller acquires output data from the processor and sends them to a PC, which calculates the rotor position. Theoretical analysis, supported by experimental results, show that the sensitivity to mechanical nonidealities of the sensing element is higher in the case of a conductive rotor. The resolution of the capacitive angular-position sensor over the full range (360 ) was better than 1". The measured nonlinearity was 100" and 300" for the dielectric and the conductive rotor, respectively.Index Terms-Absolute position encoder, angular position measurement, capacitance measurement, capacitive sensor, contactless angle encoder, rotary position.

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“…For microsystems, the built-in digital signal-processing capabilities can be used to eliminate complex calibration circuitry and achieve as much as two orders of magnitude of error reduction over circuit techniques and laser trims, which have difficulty following nonlinearities [49]- [51]. Look-up tables and polynomial evaluation are the two most common methods [52] for digital compensation, although a combined piece-wise polynomial approach has also been demonstrated [53]. Look-up-table algorithms [54] offer good accuracy but are very demanding on system memory.…”

Section: Software Featuresmentioning

confidence: 99%

A generic multielement microsystem for portable wireless applications

et al. 1998

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An open-architecture microsystem that can be populated with a variety of sensors and actuators is described. The microsystem is designed for low-power wireless applications where small size and high sensor accuracy are important. It consists of an in-module microcontroller connected to multiple front-end transducers through an intramodule sensor bus. An external interface allows internally processed data to be output through either a hard-wired input/output port or a radio-frequency transmitter. The present microsystem is configured for environmental monitoring and measures temperature, barometric pressure, relative humidity, and acceleration/vibration. It occupies less than 10 cc, consumes an average of 530 W from 6 V, and transmits data up to 50 m.System features such as active power management, the intramodule sensor bus, generic bus interface circuitry, and in-module sensor compensation based on bivariate polynomials are discussed.

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A microcontroller-based self-calibration technique for a smart capacitive angular-position sensor

Abstract: Abstract-

Cited by 39 publications

References 11 publications

Environmental Monitoring Systems: A Review

Environmental Monitoring Systems: A Review

A contactless capacitive angular-position sensor

A generic multielement microsystem for portable wireless applications

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