Patent ID: 7862770

Claim:
An Oxygen sensing patch using fluorescence quenching for sensing Oxygen in liquids or gases that can be used inside an enclosed area or container such as product packaging comprising: a flexible patch with adhesive on one side such that said flexible patch can be placed and held on a surface inside an enclosed area or container containing a gas or liquid to be measured for Oxygen content wherein said flexible patch is a poly acrylate consisting of 3.0 mil (76 micron) self-adhesive poly acrylate with 20 micron high track acrylic adhesive and 38 micron polyester liner; a sol gel matrix of organically modified silica that is made from a mixture comprising sol gel precursors, that is doped with a ruthenium or porphyrin complex and coated on the side of said flexible patch without the adhesive and then cured; and, said enclosed area or container having a clear area or window such that blue light can be shown through said clear area or window onto said flexible patch and fluorescence from said ruthenium or porphyrin complex contained in said sol gel matrix can be detected through said clear area or window to measure the partial pressure of dissolved or gaseous Oxygen.