Device for emitting and controlling infrared light and gas sensor using such a device

A device for emitting infrared light, comprising:

• a substrate, comprising a bottom surface and a top surface, the substrate extending between the bottom surface and the top surface, a first cavity being formed in the substrate, the first cavity opening onto the top surface;
• a light source extending over the first cavity, the light source being configured to heat up when passed through by an electric current, so as to emit infrared light;
• a cover, covering the substrate, the cover and the substrate forming a first component enclosing the light source, the first component comprising a first bottom end and a first top end, the first component extending between the first bottom end and the first top end;
• the light source lying in a plane delineating:
• ⋅ a first half-space, comprising the cover and the first top end of the first component;
• ⋅ and a second half-space, comprising the first cavity and the first bottom end of the first component;
• wherein the device further comprises:
• an infrared-light sensor, confined in a second component, the second component comprising a second bottom end and a second top end, the second component extending between the second bottom end and the second top end;
• and wherein:
• the infrared-light sensor comprises a detecting membrane, the infrared-light sensor forming a thermal radiation detector;
• the detecting membrane lies in a second cavity that is placed under vacuum, and that forms part of the second component,
• the second component is securely fastened to the first component;
• the second top end of the second component is placed facing the first bottom end of the first component;
• such that the light source is arranged to emit:
• ⋅ a first portion of the light into the first half-space, and through the cover;
• ⋅ and a second portion of the light into the second space, and through the substrate, toward the infrared-light sensor, the latter being configured to control an intensity of the light emitted by the light source.