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.
| Original language | English |
|---|---|
| Pages (from-to) | 1059-1076 |
| Number of pages | 18 |
| Journal | International Journal on Smart Sensing and Intelligent Systems |
| Volume | 7 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2014 |
| Externally published | Yes |
Keywords
- Detection circuit
- Digital phase angle measurement
- Moisture sensing
- Porous sensors
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering