Luminescence oxygen measurement is based on the ability of molecular oxygen to quench the emissive excited states of compounds leading to reductions in their luminescent intensity and lifetime. During collisional quenching, energy from the photo-excited indicator molecule is transferred to the ground state oxygen molecule which then relaxes from its excited single state by vibrationally releasing the acquired energy. Increases in the oxygen level increases the degree of oxygen quenching yielding lower emissive signals and shorter luminescence lifetimes. As a result, the observed lifetime is inversely proportional to the oxygen partial pressure present.
Available ranges of operation
O2 Low – 0 to 5% O2 (1 ATM)
O2 High – 0 to 100% O2 (1 ATM)
O2 Extreme – 0 to 100% O2 (3 ATM)