Patent ID: 7456971

Claim:
An optical gas sensing apparatus for sensing gas, comprising: a tubular housing member that has a light-reflecting inner surface; a column light source member that is provided to a first end portion of the housing member, wherein the light source member has a light source, which emits light; a column light sensing element member that is provided to a second end portion of the housing member, wherein the light sensing element member has a light sensing element, which senses the light emitted by the light source; an adhesive that connects the housing member to at least one of the light source member and the light sensing element member; and at least one collecting member, which is provided in at least one of the following positions: in a first connection located between the housing member and the light source member; and in a second connection located between the housing member and the light sensing element member, wherein the at least one collecting member defines a recess, the recess includes a space that extends in a direction perpendicular to an axis of the tubular housing member, and the adhesive collects in the space.