Absorbent dome for a radiating collector tube

Device for thermal monitoring for a piece of equipment, whereby said piece of equipment is integrated on a craft placed in a forced vacuum environment, an outside part (7) of the equipment projecting outside of a wall (3) of the craft and being subjected to a radiation flux by an external source (15),

• characterized in that the device comprises:
• First collection means of at least a portion of the radiation emitted by the external radiation source (15), whereby said collection means comprise an absorbent screen (13) that is suitable for being placed between the outside part (7) of the equipment and the wall (3) of the craft, whereby this screen (13) has—on at least one portion of its front face, designed to be placed on the side removed from the wall of the craft—an absorbent surface with the largest possible absorptivity αSOLAR in the field of solar radiation, linked to a low emissivity εIR in the infrared spectrum,
• At least a second emission surface with a high emissivity εIR in the infrared spectrum, radiating toward the outside of the craft but not toward the outside part of the equipment,
• Means for heat transport between the absorbent surface and the emission surfaces.