A Stand-alone Multi-scent Olfactory Display with a Sliding Scent Switching Mechanism

Here we report on the design, construction, and testing of a multi-scent olfactory display that is intended as promotional tool for smell-related events. Our system used off-the-shelf spray bottles for scent generation, with a control and actuation system constructed around it. The spray bottle is actuated using a solenoid valve, combined with a fan to help deliver the aroma to the user. Scent switching is achieved by sliding the spray bottles on a fixed rail. A step motor is then used to select scents accurately. The final unit can release up to four different scents and testing results show that the unit can be controlled for scent delivery at a range of firing rates.