A microfabricated fringing field capacitive pH sensor with an integrated readout circuit

Circuit oscillations; Microfabrication; Natural frequencies; Pelletizing; Sensors; Frequency shift; Fringe fields; Fringing fields; Integrated readout; Inter-digitated electrodes; Microfabricated; Permittivity change; Read-out circuit; Readout systems

Abstract :

[en] This work presents a microfabricated fringe-field capacitive pH sensor using interdigitated electrodes and an integrated modulation-based readout circuit. The changes in capacitance of the sensor result from the permittivity changes due to pH variations and are converted to frequency shifts using a crossed-coupled voltage controlled oscillator readout circuit. The shift in resonant frequency of the readout circuit is 30.96 MHz for a change in pH of 1.0-5.0. The sensor can be used for the measurement of low pH levels, such as gastric acid, and can be integrated with electronic pills. The measurement results show high repeatability, low noise, and a stable output. © 2014 AIP Publishing LLC.

Disciplines :

Electrical & electronics engineering

Author, co-author :

Arefin, M. S.; Electrical and Computer Systems Engineering, Monash University, Melbourne, VIC, Australia

Bulut Coskun, M.; Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia

Alan, T.; Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia

Redouté, Jean-Michel ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés

Neild, A.; Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia

Rasit Yuce, M.; Electrical and Computer Systems Engineering, Monash University, Melbourne, VIC, Australia

Language :

English

Title :

A microfabricated fringing field capacitive pH sensor with an integrated readout circuit

Publication date :

2014

Journal title :

Applied Physics Letters

ISSN :

0003-6951

eISSN :

1077-3118

Publisher :

American Institute of Physics Inc.

Volume :

104

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 04 February 2019

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