Abstract
An artificial olfactory system coupled with an odor generation system is herein reported. The artificial olfactory system is composed of four chemical sensors consisting of quartz crystal microbalances (QCMs) coated with room temperature ionic liquids (RTILs). The sensors are interrogated by four vector network analyzers, which are used to measure the series resonant frequency and motional resistance. The odor generation system can generate eight different odors and mix them in any composition. Solenoid valves are used to switch the path and control the concentration of the different odors before blending. Two algorithms to control the solenoid valves, delta-sigma modulator, and simple pulse width modulation (PWM) are studied, optimized, and compared. Finally, the uncertainty of the odor generating system is calculated.
Highlights
Human senses that detect chemical compounds, in particular scent and taste, have been traditionally left out of digitalization
The sensor array in this artificial olfactory system consists of four quartz crystal microbalances (QCMs) placed inside a small chamber
This SNRdis is lower as we approach shorter minimum pulses, because the errors caused by the valve operation time difference become more important
Summary
Human senses that detect chemical compounds, in particular scent and taste, have been traditionally left out of digitalization. Other solutions use mass flow controllers or valves to control and mix flows With all these issues, odor generation systems have multiple restrictions on their practical applications, and as a result devices are usually confined to laboratories and prototypes. The odors are generated by air flow vaporization and mixing components before the odor presentation This method has the advantages of being versatile as well as the possibility of digitally generating different scents on demand [8]. This system uses solenoid valves to generate concentrations. A characterization of the system is performed to obtain a quantitative estimation of the gas concentration uncertainty that facilitates future comparison with other devices
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