Device for emitting and controlling infrared light, comprising: - a substrate, extending between a bottom surface (11 i) and a top surface (11 s), a cavity (11 c) being formed in the substrate, the cavity opening onto the top surface; - a light source (12 m) extending over the cavity (11 c), able 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 (12 m), the first component extending between a bottom end (10 i) and a top end (10 s); - the light source (12 m) lying in a plane delineating a first half-space (E 1), comprising the cover and the top end (10 s) of the first component, and a second half-space (E 2), comprising the cavity (11 c) and the bottom end (10 i) of the first component; the device being such that it comprises: - an infrared-light sensor (22 m) confined in a second component, the second component extending between a bottom end (20 i) and a top end (20 s); the device being such that: - the second component is securely fastened to the first component; - the top end (20 s) of the second component is placed facing the bottom end (10 i) of the first component; such that the light source (12 m) is arranged to emit a first portion of the light into the first half-space (E 1), and through the cover, and a second portion of the light into the second space (E 2), and through the substrate, toward the infrared-light sensor (22 m), the latter being able to control an intensity of the light emitted by the light source; the device being characterized in that: - the infrared-light sensor comprises a detecting membrane (22 m), the infrared-light sensor forming a thermal radiation detector; - the detecting membrane lies in a cavity (21 c) that is placed under vacuum via removal of air, and that forms part of the second component. - a substrate, extending between a bottom surface (11 i) and a top surface (11 s), a cavity (11 c) being formed in the substrate, the cavity opening onto the top surface; - a light source (12 m) extending over the cavity (11 c), able 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 (12 m), the first component extending between a bottom end (10 i) and a top end (10 s); - the light source (12 m) lying in a plane delineating a first half-space (E 1), comprising the cover and the top end (10 s) of the first component, and a second half-space (E 2), comprising the cavity (11 c) and the bottom end (10 i) of the first component; the device being such that it comprises: - an infrared-light sensor (22 m) confined in a second component, the second component extending between a bottom end (20 i) and a top end (20 s); - an infrared-light sensor (22 m) confined in a second component, the second component extending between a bottom end (20 i) and a top end (20 s); the device being such that: - the second component is securely fastened to the first component; - the top end (20 s) of the second component is placed facing the bottom end (10 i) of the first component; - the second component is securely fastened to the first component; - the top end (20 s) of the second component is placed facing the bottom end (10 i) of the first component; such that the light source (12 m) is arranged to emit a first portion of the light into the first half-space (E 1), and through the cover, and a second portion of the light into the second space (E 2), and through the substrate, toward the infrared-light sensor (22 m), the latter being able to control an intensity of the light emitted by the light source; the device being characterized in that: - the infrared-light sensor comprises a detecting membrane (22 m), the infrared-light sensor forming a thermal radiation detector; - the detecting membrane lies in a cavity (21 c) that is placed under vacuum via removal of air, and that forms part of the second component. - the infrared-light sensor comprises a detecting membrane (22 m), the infrared-light sensor forming a thermal radiation detector; - the detecting membrane lies in a cavity (21 c) that is placed under vacuum via removal of air, and that forms part of the second component.