Optical sensor and method for measuring blood gas

An optical sensor for measuring blood gas, used to measure gas concentration in a liquid, comprising:

• a first container for storing the liquid;
• a conduit passing through said first container for filling with an indicator solution wherein the gas in the liquid can diffuse into said conduit by liquid pressure to react with said indicator solution so as to change the color of said indicator solution and the light absorbability of said reacted indicator solution decreases as the concentration of the gas diffusing in said conduit increases;
• a second container connected to said conduit for receiving said reacted indicator solution in said conduit;
• and
• a light emitter and a photodetector provided in opposition to each other at the two sides of said second container wherein said light emitter emits light towards said second container and said photodetector receives the light passing through said second container and said reacted indicator solution and thereby outputs a sensing signal depending on the received light intensity.

A method for measuring blood gas, used to measure gas concentration in a liquid, comprising:

• filling an indicator solution into a conduit wherein said conduit passes through the liquid;
• allowing the gas in the liquid diffusing into said conduit to react with said indicator solution so as to become a reacted indicator solution wherein the light absorbability of said reacted indicator solution decreases as the concentration of the gas diffusing into said conduit increases;
• using a light emitter for emitting light to let the light pass through said reacted indicator solution;
• and
• using a photodetector for receiving the light passing through said reacted indicator solution and thereby outputting a sensing signal depending on the received light intensity.

An optical sensor for measuring blood gas, used to measure gas concentration in a liquid, said optical sensor, comprising:

• a container with an opening for storing an indicator solution;
• a silica gel layer for sealing said opening;
• and
• a light emitter and a photodetector provided in opposition to each other at the two sides of said container wherein said photodetector receives the light emitted from said light emitter passing through said container and said indicator solution and thereby outputs a sensing signal depending on the received light intensity.