Abstract
In this chapter we first review the properties of a discrete array of field effect devices to understand some of their selectivity properties. A scanning light pulse technique applied for gas sensing will then be described. The use of the technique to produce maps of the gas sensitivity of large catalytic metal areas is demonstrated. The metal area consisted of overlapping bands of platinum, iridium and palladium which were kept “cold” (≈ 110 °C) at one end and “hot” (≈ 180 °C) at the other end. It is shown how, for example, ammonia, ethanol and hydrogen in air produce distinctly different maps which can be further processed to yield images identifying the gas. These first “olfactory images” serve as an illustration to what can be achieved with a continuous sensing surface or a large chemical sensor matrix. The similarity between such images and pattern formation in the olfactory systems is also pointed out.
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References
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© 1992 Springer Science+Business Media Dordrecht
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Lundström, I., Hedborg, E., Spetz, A., Sundgren, H., Winquist, F. (1992). Electronic Noses Based on Field Effect Structures. In: Gardner, J.W., Bartlett, P.N. (eds) Sensors and Sensory Systems for an Electronic Nose. NATO ASI Series, vol 212. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7985-8_18
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DOI: https://doi.org/10.1007/978-94-015-7985-8_18
Publisher Name: Springer, Dordrecht
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