Method and apparatus for oxygen determination

Details Method and apparatus for oxygen determination Method and apparatus for oxygen determination

G - Physics

01

N

150/19, 150/7

G01N 33/52 (2006.01) G01N 21/64 (2006.01) G01N 21/76 (2006.01)

Patent

CA 1261717

METHOD AND APPARATUS FOR OXYGEN DETERMINATION ABSTRACT An oxygen sensor has an inorganic complex, usually a complex of platinum group metals, with ?-diimine ligands immobilized in a polymer support. The metal com- plex is a luminescent material quenchable by oxygen. The polymer is permeable to oxygen and impermeable to interfering quenchers. Oxygen concentration in a gase- ous or liquid environment is determined by exposing the sensor to the environment and measuring the quenching- related decrease in intensity or lifetime of luminescence. In one version, a reference device has areas of differing size or concentration of luminescent material immobilized in a support which is relatively impermeable to oxygen. Matching the luminescence of the sensor with the luminescence of an area of the reference device determines the extent of quenching and the concentration of oxygen. An alterna- tive sensor has a mixture of luminescent materials having differing sensitivities to oxygen quenching and differing colors of emission.

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