| 摘要 |
PROBLEM TO BE SOLVED: To maintain a thermal expansion coefficient of conventional Invar (R) and suppress martensitic transformation during cooling, because covar and Invar used for the tip end of an inner cylinder as a Dewar heat conductor causes martensitic transformation partially or in total, and volume expansion at a cryogenic temperature of about 80 K and resultantly large stress is possibly generated in an infrared detector mount of the Dewar. SOLUTION: The infrared detector of this invention comprises a Dewar having a vacuum thermal insulation structure composed of an outer cylinder having a window transmitting incident infrared rays and of an inner cylinder integrated with the outer cylinder and forming a space for inserting a cooling means; and an infrared detector arranged in the Dewar heat conduction part at the tip end of the inner cylinder of the Dewar, and cooled by the cooling means. The Dewar heat conductive part is made of an Invar alloy (36% Ni-Fe) with the carbon content being 0.06 to 0.1%. COPYRIGHT: (C)2005,JPO&NCIPI
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