Optical sensor device

A sensor device for measuring at least one first analyte and a second analyte, the sensor device comprising:

• a cavity;
• a buffer contained in the cavity;
• a membrane, limiting the cavity at least on one side of the cavity, wherein the membrane includes at least one first dye within the membrane, each of the at least one first dye exhibiting a first optical behaviour which depends on a respective first analyte;
• a second dye mixed with the buffer, the second dye exhibiting a second optical behaviour which depends on a pH-value in the buffer, wherein the pH-value in the buffer depends on the second analyte;
• a reservoir of the buffer and the second dye, wherein the reservoir is in diffusive contact with the cavity;
• an optics section, the optics section including a dichroic mirror and an associated photodetector for each of the at least one first dye and also including a dichroic mirror and an associated photodetector for the second dye;
• a control and evaluation section for controlling the optics section and processing signals received from the photodetectors of the optics section;
• and,
• a housing, closed on one side by the membrane, wherein the control and evaluation section, the optics section, and the cavity are contained in the housing.

A sensor device for measuring at least one first analyte and a second analyte, the sensor device comprising:

• a cavity;
• a buffer contained in the cavity;
• a membrane, limiting the cavity at least on one side of the cavity, wherein the membrane includes at least one first dye within the membrane, each of the at least one first dye exhibiting a first optical behaviour which depends on a respective first analyte;
• a second dye mixed with the buffer, the second dye exhibiting a second optical behaviour which depends on a pH-value in the buffer, wherein the pH-value in the buffer depends on the second analyte;
• a reservoir of the buffer and the second dye, wherein the reservoir is in diffusive contact with the cavity;
• an optics section, the optics section including a dichroic mirror and an associated photodetector for each of the at least one first dye and also including a dichroic mirror and an associated photodetector for the second dye;
• and,
• a control and evaluation section for controlling the optics section and processing signals received from the photodetectors of the optics section;
• wherein the cavity with the membrane is detachable from the optics section.