... Yu and his co-author, Yuhang Li of Beihang University in Beijing (both of whom have backgrounds designing flexible electronics), developed two wearable interfaces. One can adhere to the skin between the nose and mouth like a bandage; the other straps on beneath a headset like a face mask.
Both types of interfaces use miniaturized odor generators, a grid of tiny containers filled with perfumed paraffin wax. When a heat source beneath the wax is activated, the wax heats up, essentially becoming a scented candle capable of reproducing multiple odors within 1.44 seconds, according to Yu and Li. When the experience is over, a copper coil kicks a magnet to tamp down on the wax and cool down, ending the scent. ...
See the full story here: https://www.technologyreview.com/2023/05/09/1072731/vr-smell/https://www.technologyreview.com/2023/05/09/1072731/vr-smell/