The Optical Sensors Laboratory (OSL) at Dublin City University is a multi-disciplinary team of more than 30 researchers who develop optical solutions to real world measurement problems in areas such as environmental monitoring, biomedical sensing and food safety. Projects range from fundamental investigations of anisotropic emission in optical waveguides to the development and testing of a prototype instrument for human breath monitoring of athletes in training. OSL is a node of the National Centre for Sensor Research (NCSR).