Publication Details:
Journal or Publication Title:
Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Title:
Nonlinear Processing at Signal Conditioning of Gas Sensors Based on Semiconductor Nanocomposites
Creator:
Corporate Creators:
Center of Semiconductor Devices and Nanotechnologies,Yerevan State University
Subject:
Uncontrolled Keywords:
gas sensors ; linearization scheme ; Wheatstone bridge ; nonlinearity
Coverage:
Abstract:
One of the major advantages of high resistance gas sensors (HRGS) based on MWCNT/SnO2 nanocomposite is the relatively high variation of the output parameter. However, these types of GSs have several specific features making the processing of gas registration and measurement results difficult. These features involve distribution of resistance at very low registration values of gas concentration, and considerable non-linearity of load characteristic as a result of inversely proportional character of transformation function from gas concentration to resistance. Elimination of these unfavorable characteristics is possible also to perform in input measurement circuits through proportional changing of HRGS conductivity to electric signal. For linearization of output characteristics of MWCNT/SnO2 gas sensors, we propose also to use the Wheatstone bridge circuit.