PPG chewing sensor Sample Clauses

PPG chewing sensor. The PPG sensor uses an optical technique for the detection of eating. This PPG sensor is embedded into an earhook of an earphone (Figure 5, A); a LED light is attached near the inside of the ear and covered by a soft foam cushion, and a photodiode is attached near the back of the ear. The LED light transmits light into tissue of the ear. On the other side of that tissue a photodiode is placed to detect how much light has been able to pass the tissue (for an example see Figure 5, B). This amount reflects the blood volume in the microvascular bed of the tissue of the ear, but indirectly also the blood volume in the tissue that is involved in oral processing. The blood volume in these tissues will increase during eating, as the increased activity in these tissues will require additional blood supply. As a result measuring these changes in blood volume should allow for detection of eating. In order to automate this, we plan to develop detection algorithms using the dataset produced during this study.