title: Optical oxygen sensor based on phosphorescence lifetime quenching and employing a polymer immobilised metalloporphyrin probe. Part 2. Sensor membranes and results.
abstract: A gaseous oxygen sensor is described based on the measurement of phosphorescence lifetime of the dye palladium coproporphyrin, immobilised in a range of membrane materials including polyvinyl chloride, polymethylmethacrylate, polystyrene and silicone rubber. The lifetime of the dye in these materials is described, measured using a simple system consisting of a pulsed xenon flash lamp light source and a PC-based data acquisition system. The linearity of the sensing membranes over the 0-100 per cent oxygen range is presented together with data on temperature sensitivity, the effects of CO2, N2O, H2O and halothane, and the effects of ageing over a 90 day period. The sensors based upon polystyrene immobilised dye appear to provide the optimum characteristics for a gaseous oxygen sensor.
authors.affiliation: Department of Medical Physics & Bioengineering, University College London, UK.
authors.forename: P M
authors.initials: PM
authors.lastname: Gewehr
authors.forename: D T
authors.initials: DT
authors.lastname: Delpy
mesh_terms: D006801:Humans; D008163:Luminescent Measurements; D008567:Membranes, Artificial; D008665:Metalloporphyrins; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000379:methods; D010100:Oxygen / Q000032:analysis*; D010313:Partial Pressure; D013997:Time Factors
chemical_list: D008567:Membranes, Artificial; D008665:Metalloporphyrins; D010100:Oxygen