Abstract
Machine olfaction is a novel technology and has been developed for many years. The electronic nose with an array of gas sensors, a crucial application form of the machine olfaction, is capable of sensing not only odorous compounds, but also odorless chemicals. Because of its fast response, mobility and easy of use, the electronic nose has been applied to scientific and commercial uses such as environment monitoring and food processing inspection. Additionally, odor characterization and reproduction are the two novel parts of machine olfaction, which extend the field of machine olfaction. Odor characterization is the technique that characterizes odorants as some form of general odor information. At present, there have already been odor characterizations by means of the electronic nose. Odor reproduction is the technique that re-produces an odor by some form of general odor information and displays the odor by the olfactory display. It enhances the human ability of controlling odors just as the control of light and voice. In analogy to visual and auditory display technologies, is it possible that the olfactory display will be used in our daily life? There have already been some efforts toward odor reproduction and olfactory displays.
Highlights
IntroductionThe electronic nose is comprised of an array of gas sensors and is capable of sensing both odorous and odorless volatile compounds
The earliest research on a machine olfaction system can be dated to 1961 [1]
In analogy to visual and auditory display technologies, is it possible that the olfactory display will be used in our daily life? There have already been some efforts toward odor reproduction and olfactory displays
Summary
The electronic nose is comprised of an array of gas sensors and is capable of sensing both odorous and odorless volatile compounds. An electronic nose can be applied to monitor the quality of wine in the fermentation stages [9]. Compared to other detecting instruments, electronic noses have several advantages. The electronic nose is smaller in size and has higher mobility. This makes the electronic nose a suitable instrument to detect the quality of raw materials or products by sensing their volatile chemicals on the production line. The mobility of an electronic nose makes it possible to set up real-time and on-site detection, which reduce the long travel from the sampling site to a laboratory. The performance in an Sensors 2018, 18, 2329; doi:10.3390/s18072329 www.mdpi.com/journal/sensors
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