This paper reports on olfactory amplifying systems and reviews related technologies. We have developed two types of olfactory amplifying systems that allow the user to sense smells with amplified sensitivities. In the first system, odor molecules drifting in the air are collected using an adsorbent material. The concentrated odor vapor is generated and presented to the user by thermal desorption of the collected odor molecules. The second system is a virtual odor concentrator. An odor with an amplified intensity is presented to the user when the presence of a volatile organic compound in the air is detected using a gas sensor. These systems can be viewed as olfactory versions of augmented reality systems. The user's perception of the world is altered by modifying the olfactory stimuli perceived by the user's nose. On-going research efforts toward the development of the olfactory amplifying systems are presented in this paper, and their potential applications are discussed.
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