| 摘要 |
PURPOSE:To prevent the occurrence of clogging caused by ambient air flowed into a Dewar vessel, by sealing up the discharge side of a gas liquefier with a drier enclosed with a drying agent and sealing material. CONSTITUTION:A Dewar vessel 5, in which an infrared rays detector 4 is built in, is stuck to a Dewar vessel holder 8 and is held on the holder 8 and also, a drier 9 is provided at one end of the holder 8. A sealing material 11 performs duties to keep airtightness between a mandrel 7 fitted to the holder 8 and the holder 8. Discharged gas from the vessel 5 and ambient air flowing into the vessel 5 are flowed through the drier 9. Accordingly, humidity is removed by the action of the drier 9 even when the air current flowing into the vessel 5 contains moisture in a high humidity, and the inner part of the vessel 5 is kept under dry condition. |
