1 research outputs found
Environmental engineering applications of electronic nose systems based on MOX gas sensors
Nowadays, the electronic nose (e-nose) has gained a huge amount of attention due to its
ability to detect and differentiate mixtures of various gases and odors using a limited number of sensors.
Its applications in the environmental fields include analysis of the parameters for environmental
control, process control, and confirming the efficiency of the odor-control systems. The e-nose has
been developed by mimicking the olfactory system of mammals. This paper investigates e-noses
and their sensors for the detection of environmental contaminants. Among different types of gas
chemical sensors, metal oxide semiconductor sensors (MOXs) can be used for the detection of volatile
compounds in air at ppm and sub-ppm levels. In this regard, the advantages and disadvantages
of MOX sensors and the solutions to solve the problems arising upon these sensors’ applications
are addressed, and the research works in the field of environmental contamination monitoring are
overviewed. These studies have revealed the suitability of e-noses for most of the reported applications,
especially when the tools were specifically developed for that application, e.g., in the facilities
of water and wastewater management systems. As a general rule, the literature review discusses the
aspects related to various applications as well as the development of effective solutions. However,
the main limitation in the expansion of the use of e-noses as an environmental monitoring tool is
their complexity and lack of specific standards, which can be corrected through appropriate data
processing methods applications