Oscillating behaviour of hazardous gas on tin oxide gas sensor: Fourier and wavelet transform analysis

Xing Jiu Huang, Yang Kyu Choi, Kwang Seok Yun, Euisik Yoon

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The oscillating behaviour of TGS813 and TGS203S sensors in hazardous gases such as LPG and CO was studied under the oscillating conditions of rectangular wave, applied voltage 5 V, and duty ratio as 30 s/(30 s + 20 s). It was shown that the oscillating behaviour was obviously different with the two type sensors. The data features were extracted by using Fourier and wavelet transform (WT). There were some very obscure differences among the amplitudes in fast Fourier transform (FFT) under different concentrations of LPG or CO. Further FFT analysis showed that it was difficult to discriminate between 800 ppm LPG and 800 ppm CO because of very little difference in the frequency content. By comparison, the corresponding coefficient plots in continuous wavelet transform (CWT) were investigated, and the original signal was also decomposed into coarse approximation A1 and five detailed information D5-D1. The results showed that the WT was more appropriate than FFT for the frequency-time problem.

Original languageEnglish
Pages (from-to)357-364
Number of pages8
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2006 May 23

Bibliographical note

Funding Information:
This work was supported by Brain Korea 21 project, the school of information technology, Korea Advanced Institute of Science and Technology in 2005.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


Dive into the research topics of 'Oscillating behaviour of hazardous gas on tin oxide gas sensor: Fourier and wavelet transform analysis'. Together they form a unique fingerprint.

Cite this