A. Galdikas et al., Specific set of the time constants for characterisation of organic volatile compounds in the output of metal oxide sensors, SENS ACTU-B, 68(1-3), 2000, pp. 335-343
The time dependence of the resistance response to a steep change of gas com
position in the atmosphere is investigated for the gas sensors based on tin
oxide and indium oxide thin films. The dependence is assumed to pertain to
the exponential decrease with thrice time constants for the slope. The lea
ding edge of the response is analysed for the sensors with the aim of chara
cterising the target smell using a set of time constants instead of the equ
ilibrium response signal. The sets are applied for the characterisation of
the volatile substances emitted from the model solutions based on glucose a
nd glycine in which Maillard's browning reaction took place. In the sets, t
he collection of the time constants is shown being characteristic of the od
our produced by the target solutions. Based on the sets, volatile compounds
could be recognised in the aroma. (C) 2000 Elsevier Science S.A. All right
s reserved.