Nonlinear Analysis of Transient Response in Thin Film based Ammonia Detector

Authors: Sai Venkatesh Balasubramanian

The nonlinear analysis of the transient response of a Gallium Oxide thin film based ammonia detector is performed using standard techniques such as Wavelet Analysis and Lyapunov Exponents, all of these targeted towards the resistance transient response as a function of ammonia concentration in ppm. While the distance plots reveal maximum asymmetry in the vicinity of 5ppm, positive Lyapunov Exponents obtained confirm the presence of chaos, while exhibiting a very prominent peak at 5ppm concentration levels. This trend is attributed to the moderate response and recovery times seen for the 5ppm concentration level, making it an ‘optimum’ level of sensitivity. It is opined that the results of nonlinear analysis presented in this work will serve as a stepping stone in the systematic benchmarking of various sensing mechanisms taking into account the nonlinearity in the underlying mechanisms.

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[v1] 2015-10-28 09:24:08

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