Optimized infrared light source for a gas sensor, and manufacturing method thereof

A method for producing a light source, comprising:

• i) obtaining a basic light source, the basic light source comprising an emitting membrane that extends, parallel to a radial plane, about a center of the emitting membrane, and that is placed in a cavity bounded by a basic cover, the basic cover extending between an internal face, placed facing the emitting membrane, and a first face, the first face of the basic cover lying parallel to the radial plane;
• ii) obtaining an auxiliary cover, extending between a second face and an external face, a distance between the second face and the first face defining a thickness of the auxiliary cover, the external face comprising at least one center of the external face;
• iii) machining the external face of the auxiliary cover, so as to form, in the external face, at least one peripheral portion, adjacent to a planar central portion, the central portion passing through the center of the external face, and being parallel to the second face, the peripheral portion being inclined with respect to the central portion such that, in the peripheral portion, the thickness of the auxiliary cover decreases as a function of a distance from the center of the external face;
• and
• iv) assembling the auxiliary cover against the basic cover, the second face making contact with the first face, the assembly being carried out in such a way that the center of the external face is aligned with the center of the emitting membrane, parallel to a transverse axis perpendicular to the radial plane.