Manufacture of device for absorbing residual gases in vessel under vacuum, where device is activated by heating by joule effect when electrical current is passed through it

摘要

The material (2) is deposited on a structure (5) combining an insulating layer (6, 9) with a resistive electrical conductor (5), ensuring that the electrical current reaches the adsorption device. The structure is made by co-frittage or by baking together the different elements. The device is used in an electromagnetic wave detector, in particular working in the infra-red. After the material forming the absorption device is deposited, the structure undergoes a second stage of frittage. The insulating layers are made of alumina ceramic and the conductor is made of an electrically conducting refractive material, particularly tungsten or molybdenum. Alternatively, the conductor is made of an electrically resistive conductor. An intermediate insulating layer (9) is placed between the absorbent and the resistive conducting layer of the structure, or the absorbent is deposited directly on the conducting layer. An Independent claim is also included for an electromagnetic wave detector, in particular infra-red, integrating a vessel under vacuum with at least one detection circuit for the waves or rays and containing such a device for absorbing residual gases.