A calibrated piston source of light, which simulates a cylindrical-volume luminosity source, has been used to
measure the absolute concentration of O2(a1Δ). It is proved that this piston source method is one of the
simplest and most convenient ways to measure the O2(a1Δ) concentration in a singlet oxygen generator,
especially in real time measurements. Discussions about the method and the results are also given.
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