Optical Sensors: Principles and Applications

This lecture covers the principles and applications of optical sensors, including optical heart rate monitors, image sensors, distance sensors, and gas sensors. It explains the functioning of various sensors such as proximity sensors, optical mouse sensors, and photoluminescence-based sensors. The lecture also delves into the working mechanisms of different optical sensors like optical fingerprint sensors and photoluminescence-based oxygen sensors. Additionally, it discusses the use of infrared sensors for gas detection, detailing the operation of IR transparent windows, IR sources, and gas concentration measurement. The lecture concludes with an overview of IR photoacoustic gas sensors, highlighting their principle of operation, gas selectivity, and detection limits.