Patent ID: 8896834

Claim:
An optical gas sensor, comprising: a substrate; a light source, disposed in the substrate; at least one light detector, disposed in the substrate; and at least one reaction chamber structure, disposed in the substrate and connected between the light source and the light detector, wherein the distance from the light source to the light detector is d, and a shortest travel path of a light from the light source to the light detector through the reaction chamber structure is greater than d, wherein the at least one reaction chamber structure is composed of a first sub-substrate and a second sub-substrate, the first sub-substrate has a plurality of convex portions and concave portions disposed alternately, the second sub-substrate has a plurality of convex portions and concave portions disposed alternately, and wherein the convex portions of the first sub-substrate correspond to the concave portions of the second sub-substrate, and the concave portions of the first sub-substrate correspond to the convex portions of the second sub-substrate.