Engineers from Tufts University (USA) have developed a compact and wireless sensor that attaches to the tooth and collects information on the concentration of glucose, salt, alcohol and other substances in food and beverages consumed by humans. The data is transmitted by a passive antenna.
The sensor represents several prototypes in the form of a frame with sides of 2 or 3 mm. It consists of three layers: two gold open ring resonators, between them a layer of hydrogel or silk, tells N + 1. When solutions of different substances pass through the middle layer, it increases its thickness. Because of this, the resonance frequency and the amplitude of the outgoing signal from the sensor change.
Researchers conducted tests on volunteers: the sensor demonstrated its efficiency. In addition, it turned out that when using a hydrogel, it is possible to record changes in the hydrogen index and temperature.