A SENSITIVE DIGITAL MOISTURE DETECTOR FOR NANOSTRUCTURED THIN FILM SENSOR

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering , Engineering, Electrical & Electronic

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VOLUME 7 , ISSUE 3 (September 2014) > List of articles

A SENSITIVE DIGITAL MOISTURE DETECTOR FOR NANOSTRUCTURED THIN FILM SENSOR

TARIKUL ISLAM * / MD. FIROZ A / KHAN, S. A. KHAN / H. SAHA

Keywords : Porous sensors, moisture sensing, digital phase angle measurement, detection circuit.

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 7, Issue 3, Pages 1,059-1,076, DOI: https://doi.org/10.21307/ijssis-2017-694

License : (CC BY-NC-ND 4.0)

Received Date : 16-May-2014 / Accepted: 04-July-2014 / Published Online: 01-September-2014

ARTICLE

ABSTRACT

A digital moisture measuring instrument based on phase angle measuring technique with porous silicon (PSi) or porous alumina (PA) as capacitive moisture sensor is proposed. The proposed technique can measure digitally the phase angle change of capacitive impedance of porous silicon or porous alumina sensor due to change in moisture concentration in terms of clock pulses. Analysis shows that the proposed circuit leads to higher precision by minimizing the errors caused by parasitic earth capacitance as well as offset voltage in the circuit. Simulation and experimental results are reported to confirm the effectiveness of the technique.

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