Dr. Keat Ghee Ong’s Biosensors Lab focuses on the development of wireless, passive implantable biosensors for human physiological measurements. Ongoing projects include the design and fabrication of implantable strain sensors for real-time monitoring of compressive forces in knee implants, implantable micro pressure sensors for detecting arterial in-stent stenosis, and implantable chemical sensors for measuring body electrolytes. The wireless, passive sensors developed in this lab are based on two adjacently placed ferromagnetic strips: one magnetically soft and the other magnetically hard. When the separation distance between these two strips varies, the magnetic signature changes within soft magnetic strip.   This change allows for wireless detection of the sensor response by measuring the change in induced magnetic field.