A novel sol-gel thin-film constant phase sensor for high humidity measurement in the range of 50%-100% RH

Tarikul Islam, Zia Ur Rahman, Subhas Chandra Mukhopadhyay*

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper proposes a new type constant phase sensor (CPS) for solving the problem of high humidity measurement. It is based on change in phase angle of the CPS with variation of humidity. The CPS is having interdigitated electrode sandwiched between two identical thin films of γ-Al2O3 fabricated by sol-gel dipcoating method. In the presence of relative humidity, the device shows a fairly constant phase behavior over wide signal frequency and its fractional exponent reduces to nearly 0.7 value at 90% RH from the initial value of 1 at dry humidity. Results show that the CPS is effective in measuring humidity in the range of 50%-100% RH at the signal frequency of 1-5 MHz. Finally, the device has been interfaced with a simple fractional-order differentiator circuit to measure the phase angle change with change in relative humidity.

Original languageEnglish
Article number6983534
Pages (from-to)2370-2376
Number of pages7
JournalIEEE Sensors Journal
Volume15
Issue number4
DOIs
Publication statusPublished - 1 Apr 2015
Externally publishedYes

Keywords

  • Constant phase sensor
  • fractional order differentiator
  • high humidity measurement
  • sol-gel method
  • γ- Al2O3

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