Oxygen percentage measurements, through analysis of light emitted by phosphorescence

The measurement of Oxygen percentage included in fluids is an interesting and important value. This value can not be obtained in an easy way, so this is the reason why this article is presented. A way to measure this value through the lifetime of phosphorescence is shown. In order to get the lifetime, is necessary to process the signal in a digital way, so it has been used a DSP. The phosphorescent material has to be excited if we want to get light emitted by phosphorescence, this is the reason for using a Xenon lamp and a chemical sensor which emits phosphorescent light. Another important part is the transduction of phosphorescent light to an electrical signal. This is done with a photomultiplier tube (PMT). The signal produced by the PMT is sampled in order to be processed with the DSP. In this way, the lifetime is obtained and through it, the percentage of Oxygen.