The quenching of phosphorescence lifetime by oxygen can be used as an effective method for monitoring oxygen concentratton and hence oxygen partial pressure. This technique presents many advantages over the measurement of fluorescence intensity quenching used oy many workers. These advantages are however accompanied by an increase in the measurement system complexity. The development of measurement instrumentation based on the pulsed excitation technique is described, its difficulties and limitations discussed and preliminary results presented.

The quenching of phosphorescence lifetime by oxygen can be used as an effective method for monitoring oxygen concentratton and hence oxygen partial pressure. This technique presents many advantages over the measurement of fluorescence intensity quenching used oy many workers. These advantages are however accompanied by an increase in the measurement system complexity. The development of measurement instrumentation based on the pulsed excitation technique is described, its difficulties and limitations discussed and preliminary results presented.