Noise and Repeatability of Odorant Gas Sensors in an E-Nose

Noise and Repeatability of Odorant Gas Sensors in an E-Nose

Fengchun Tian (Chongqing University, China), Simon X. Yang (University of Guelph, Canada), Xuntao Xu (Mianyang Vocational and Technical College, China) and Tao Liu (Chongqing University, China)
Copyright: © 2011 |Pages: 23
DOI: 10.4018/978-1-61520-915-6.ch004
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Abstract

The impact of the characteristics of the sensors used for electronic nose (e-nose) systems on the repeatability of the measurements is considered. The noise performance of the different types of sensors available for e-nose utilization is first examined. Following the theoretical background, the probability density functions and power spectra of noise from real sensors are presented. The impact of sensor imperfections including noise on repeatability forms the basis of the remainder of the chapter. The impact of the sensors themselves, the effect of data pre-processing methods, and the feature extraction algorithm on the repeatability are considered.
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Noise Features In The Odorant Gas Sensors

The noise from the sensor array comprising of several odorant gas sensors may result in inaccurate cluster analysis of the tested material (Goodner, Dreher & Rouseff, 2001). In our experiments, it is observed that the noise of gas sensors cannot be ignored. In the worst case, the noise magnitude may be some 20% of the signal magnitude of particular sensors. This section considers the noise features of several typical gas sensors used in the e-nose developed in our research laboratory (shown in Figure 1), including their probability distribution functions (pdfs) and power spectrum estimation, which are essential in noise cancellation (Wang & Zhang, 2002; Biswal, DeYoe, & Hyde, 1996; Friedrichs, 1995) and odor analysis by noise power spectrum (Solis, et al., 2001).

Figure 1.

A photo of the electronic nose developed in our research laboratory

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