Phosphorescent optical light emitting diodes

Figure 27-5 The optical system for measurement of PO The optica system for PO2 is based on the ability of O2 to reduce the intensity and lifetime of phosphorescence from a phosphorescent dye that is in contact with the sample. The optica system comprises a green (519-nm peak) light-emitting diode (LED, that emits light, which is reflected by a dichroic mirror onto the PO2 sensor. Because of the phosphorescence, red light (672-nm peak) is emitted back through the dichroic mirror and onto a photodetector. (From Boaith N,Wandrup J, Larsson L, et al. Blood gases and oximetry calibration-free new dry chemistry and optical technology for near-patient testing. Clin Chim Acta 2001 307 225-33.)...

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