Abstract
Lifelogging plays an important role in health management in daily life especially for elderly people. Measurement of biological signals could be done by some sensors, such as sphygmomanometer and electroencephalograph. However, to obtain secure signals, some sensors have to be firmly and securely fixed on the human body. For long time lifelogging in daily life, we should measure the biological signals casually with high precision. We call such human friendly measurement as “casual sensing”. For casual sensing of heartbeat and body motion, we developed a miniaturized load sensor using quartz crystal resonator(QCR). The fabricated sensor had superior measurement range of more than 5 x 10e5 (from 6 x 10e-5 to 30 [N]). Using this sensor put on the chair, we succeeded in simultaneous sensing of heartbeat (≈ 100 [mN]) and body motion (≈ 25 [N]). Casual sensing is quite important for lifelogging, and it will be applied for sensitive support of human especially elderly person. We expect to measure other biological signals in future for various applications to support elderly people.
