FIO 24(3-4) #52245 Fiber and Integrated Optics, 24:201–225, 2005 Copyright © Taylor & Francis Inc. ISSN: 0146-8030 print/1096-4681 online DOI: 10.1080/01468030590922731 Luminescence-Based Optical Fiber Chemical Sensors P. A. S. JORGE Unidade de Optoelectrónica e Sistemas Electrónicos Porto, Portugal, and Faculdade de Ciências da Universidade do Porto Porto, Portugal P. CALDAS Unidade de Optoelectrónica e Sistemas Electrónicos Porto, Portugal, and Instituto Politécnico de Viana do Castelo Viana do Castelo, Portugal J. C. G. ESTEVES DA SILVA Faculdade de Ciências da Universidade do Porto Porto, Portugal C. C. ROSA Unidade de Optoelectrónica e Sistemas Electrónicos Porto, Portugal, and Faculdade de Ciências da Universidade do Porto Porto, Portugal A. G. OLIVA Universidade Nova de Lisboa Oeiras, Portugal J. L. SANTOS Unidade de Optoelectrónica e Sistemas Electrónicos Porto, Portugal, and Faculdade de Ciências da Universidade do Porto Porto, Portugal F. FARAHI University of North Carolina at Charlotte Charlotte, North Carolina, USA A scheme for the simultaneous determination of temperature and analyte concentra- tion for application in luminescence-based chemical sensors is proposed. This scheme is applied to an optical oxygen sensor, which is based on the quenching of the flu- orescence of a ruthenium complex. Temperature measurement is performed using the excitation radiation and an absorption long-pass filter. Preliminary results are presented that show the viability of an oxygen measurement that is independent of temperature and optical power level. The possibility of self-referenced temperature measurements with semiconductor nanoparticles is also investigated. In order to op- timize the sensor design, several different optical fiber probe geometries for oxygen sensing are tested and compared, including different methods of coupling radiation Received 30 October 2004. Address correspondence to P. A. S. Jorge, Unidade de Optoelectrónica e Sistemas Electrónicos, INESC Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal. E-mail: pjorge@inescporto.pt 201