Absorbent dome for a radiating collector tube

A 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 of the equipment projecting outside of a wall of the craft and being subjected to a radiation flux by an external source,

• characterized in that the device comprises:
• first collection means of at least a portion of the radiation emitted by the external radiation source, whereby said collection means comprise an absorbent screen that is suitable for being placed between the outside part of the equipment and the wall of the craft, whereby this screen
• 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 an absorptivity αSOLAR in the field of solar radiation that is greater than or equal to 0.7, linked to an emissivity εIR in the infrared spectrum that is less than or equal to 0.2,
• at least one emission surface with an emissivity εIR in the infrared spectrum that is greater than or equal to 0.7, 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.