An atto-Farad resolution closed loop impedance measurement bridge for capacitive sensors

This thesis discusses the theory, circuit design, software design and measurements of an atto-Farad resolution closed-loop impedance measurement bridge circuit for capacitive sensors implemented using commercial off the shelf components.<br/>A lock-in amplifier (LIA) method is used here. The capacitive sensor embedded in an impedance bridge is...

Heartbeat Detection using Infrared Thermometry in the Ear

Heart rate is a key factor in cardiovascular system monitoring and sports science. Some recent commercial applications use sensors in the ear but are faced with motion artifacts which corrupts the signal. In this report, a comprehensive review of heart rate detection methodologies was completed in order to find possible solutions with better...