Electronic-nose for detecting environmental pollutants: Signal processing and analog front-end design


Journal Article

Environmental monitoring relies on compact, portable sensor systems capable of detecting pollutants in real-time. An integrated chemical sensor array system is developed for detection and identification of environmental pollutants in diesel and gasoline exhaust fumes. The system consists of a low noise floor analog front-end (AFE. Followed by a signal processing stage. in this paper, we present techniques to detect, digitize, denoise and classify a certain set of analytes. The proposed AFE reads out the output of eight conductometric sensors and eight amperometric electrochemical sensors and achieves 91 dB SNR at 23.4 mW quiescent power consumption for all channels. We demonstrate signal denoising using a discrete wavelet transform based technique. Appropriate features are extracted from sensor data, and pattern classification methods are used to identify the analytes. Several existing pattern classification algorithms are used for analyte detection and the comparative results are presented. © 2011 Springer Science+Business Media, LLC.

Full Text

Duke Authors

Cited Authors

  • Kim, H; Konnanath, B; Sattigeri, P; Wang, J; Mulchandani, A; Myung, N; Deshusses, MA; Spanias, A; Bakkaloglu, B

Published Date

  • January 1, 2012

Published In

Volume / Issue

  • 70 / 1

Start / End Page

  • 15 - 32

Electronic International Standard Serial Number (EISSN)

  • 1573-1979

International Standard Serial Number (ISSN)

  • 0925-1030

Digital Object Identifier (DOI)

  • 10.1007/s10470-011-9638-1

Citation Source

  • Scopus