Journal ArticleDOI
Qualitative and quantitative analysis of volatile organic compounds using transient and steady-state responses of a thick-film tin oxide gas sensor array
TLDR
Processing data from the dynamic characterisation of the sensor array, considerably improves its identification performance, rising the discrimination success rate from a 66% when only steady-state signals are used up to 100%.Abstract:
Quantitative analysis of gases, by means of semiconductor sensor arrays and pattern-recognition techniques such as artificial neural networks, has been the goal of a great deal of work over the last few years. However, the lack of selectivity, repeatability and drifts of the sensors, have limited the applications of these systems to qualitative or semi-quantitative gas analysis. While the steady-state response of the sensors is usually the signal to be processed in such analysis systems, our method consists of processing both, transient and steady-state information. The sensor transient behaviour is characterised through the measure of its conductance rise time (Tr), when there is a step change in the gas concentration. Tr is characteristic of each gas/sensor pair, concentration-independent and shows higher repeatability than the steady state measurements. An array of four thick-film tin oxide gas sensors and pattern-recognition techniques are used to discriminate and quantify among ethanol, toluene and o-xylene [concentration range: 25, 50 and 100 ppm]. A principal component analysis is carried out to show qualitatively that selectivity improves when the sensor behaviour is dynamically characterised. The steady-state and transient conductance of the array components are processed with artificial neural networks. In a first stage, a feed-forward back-propagation-trained ANN discriminates among the studied compounds. Afterwards, three separate ANN (one for each vapour) are used to quantify the previously identified compound. Processing data from the dynamic characterisation of the sensor array, considerably improves its identification performance, rising the discrimination success rate from a 66% when only steady-state signals are used up to 100%.read more
Citations
More filters
Journal ArticleDOI
Cross-reactive chemical sensor arrays.
Keith J. Albert,Nathan S. Lewis,Caroline L. Schauer,Gregory A. Sotzing,Shannon E. Stitzel,Thomas P. Vaid,David R. Walt +6 more
TL;DR: Conventional approaches to chemical sensors have traditionally made use of a “lock-and-key” design, wherein a specific receptor is synthesized in order to strongly and highly selectively bind the analyte of interest.
Journal ArticleDOI
Pattern analysis for machine olfaction: a review
TL;DR: This review paper is to provide a summary and guidelines for using the most widely used pattern analysis techniques, as well as to identify research directions that are at the frontier of sensor-based machine olfaction.
Journal ArticleDOI
Chemical gas sensor drift compensation using classifier ensembles
TL;DR: This work introduced a machine learning approach, namely an ensemble of classifiers, to solve a gas discrimination problem over extended periods of time with high accuracy rates and performs better than the baseline competing methods.
Journal ArticleDOI
Computational methods for the analysis of chemical sensor array data from volatile analytes.
Journal ArticleDOI
Higher-order chemical sensing.
TL;DR: A comparison of Orthogonality versus Independence, cross-sensitivity and Diversity, and Optimization of Excitation Profiles: Results and Outlook 609.
References
More filters
Book
Dangerous properties of industrial materials
TL;DR: In this paper, hazard analysis information for nearly 13,000 common industrial and laboratory materials is provided in a single source and hazard analysis is performed for each of these materials using hazard analysis tools.
Journal ArticleDOI
A brief history of electronic noses
TL;DR: The human nose is still the primary instrument used to assess the smell or flavour of various industrial products today, despite considerable and sustained attempts to develop new electronic instrumentation capable of mimicking its remarkable ability as discussed by the authors.
Journal ArticleDOI
Solid state gas sensors
TL;DR: The detection and monitoring of gases with solid state sensors has become a well established practice as discussed by the authors, and three major types of solid state gas sensor are already in widespread use and a number of other designs currently in development may have the potential for commercial exploitation in the future.
Journal ArticleDOI
Sensors: A Comprehensive Survey
TL;DR: In this article, the authors present a survey of the state of the art in the field of sensor science, focusing on sensor-relevant micro and nanotechnological aspects, including materials in nanotechnology and future tendencies in this field.