Patent ID: 8574921

Claim:
An optical sensing membrane for simultaneous detection of three parameters of dissolved oxygen concentration, pH and temperature, comprising a support, and a homogeneous solution immobilized on the support, wherein the homogeneous solution comprises three fluorescent dyes and is made from a homogeneous mixture solution containing: tris(4,7-dipenyl-1,10-phenanthroline) ruthenium (II) complex (Rudpp); 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS); either Quantum dots (Qds) or rhodamine B, and wherein a weight ratio of Rudpp:HPTS:Quantum dots is 0.5˜1.5:0.5˜1.5:15˜25, or a weight ratio of Rudpp:HPTS:rhodamine B is 0.5˜1.5:0.5˜1.5:0.0001˜0.001; and wherein the homogenous solution immobilized on the support constitutes a single sensor, and the three parameters of dissolved oxygen, pH and temperature are simultaneously measured by means of intensities of a single spectrum from the single sensor.