title: Absorbance Based Light Emitting Diode Optical Sensors and Sensing Devices.
abstract: The ever increasing demand for in situ monitoring of health, environment and security has created a need for reliable, miniaturised sensing devices. To achieve this, appropriate analytical devices are required that possess operating characteristics of reliability, low power consumption, low cost, autonomous operation capability and compatibility with wireless communications systems. The use of light emitting diodes (LEDs) as light sources is one strategy, which has been successfully applied in chemical sensing. This paper summarises the development and advancement of LED based chemical sensors and sensing devices in terms of their configuration and application, with the focus on transmittance and reflectance absorptiometric measurements.
authors.affiliation: Adaptive Sensors Group, National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland. martina.otoole@dcu.ie.
authors.forename: Martina
authors.initials: M
authors.lastname: O'Toole
authors.affiliation: Adaptive Sensors Group, National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland. dermot.diamond@dcu.ie.
authors.forename: Dermot
authors.initials: D
authors.lastname: Diamond
keywords: Light emitting diodes; chemical sensors; microfluidics; optical detectors