Method and dilution refrigerator for cooling at temperatures below
1.degree. K.
    1.
    发明授权
    Method and dilution refrigerator for cooling at temperatures below 1.degree. K. 失效
    方法和稀释冰箱冷却温度低于1°K

    公开(公告)号:US4499737A

    公开(公告)日:1985-02-19

    申请号:US472707

    申请日:1983-03-07

    CPC分类号: F04B45/02 F16K31/007 F25B9/12

    摘要: The dilution refrigerator operates by sucking a .sup.4 He-rich mixture from a tank and returning it to the tank through a superleak. Thereby the .sup.3 He is separated and returned to the .sup.3 He-rich content of the tank. By this cycling process, a drop in temperature is obtained at the exit of the superleak and through re-mixing of the .sup.3 He with the .sup.4 He. Cycling of the liquid .sup.3 He-.sup.4 He mixture is performed by a bellows pump maintained in a container 16 at a temperature below 2.degree. K. and by specially designed valves comprising a steel ball as a plug and a gold ring as the valve seat.

    摘要翻译: 稀释冰箱通过从罐中吸取富含四氢呋喃的混合物并通过超滤将其返回到罐中来操作。 因此,3He被分离并返回到容器的3He丰富的含量。 通过该循环过程,在超滤出口处和通过3He与4He的再混合获得温度降低。 液体3He-4He混合物的循环通过在低于2°K的温度下保持在容器16中的波纹管进行,并且通过专门设计的阀,包括作为塞子的钢球和作为阀座的金环。

    Coarse approach positioning device
    2.
    发明授权
    Coarse approach positioning device 失效
    粗略定位装置

    公开(公告)号:US4762996A

    公开(公告)日:1988-08-09

    申请号:US40659

    申请日:1987-04-20

    摘要: This die-shaped coarse-approach positioning device is particularly suited for the sample holder of a scanning tunneling microscope or the like. It comprises two blocks (21, 23), one (21) stationary, the other tiltable with respect to the stationary one. The blocks (21, 23) are connected on one side by a spring-like sheet metal (20). The tiltable block (23) can be moved, and with it the sample (33), by turning a screw (28) which presses down onto an elastic pad (30). The tilting of the tiltable block (23) occurs against the effect of the sheet metal (20) until the block (23) touches down onto a wedge (39) insertable in the gap (24) between the blocks (21, 23), and consisting of an elastic material, however, having a spring constant much higher than the effective spring constant of the sheet metal (20). In the application shown, the sample can be lowered onto a tunnel tip (34) attached to a fine-approach positioning device (35).

    摘要翻译: 该模形粗略定位装置特别适用于扫描隧道显微镜等的样品架。 它包括两个块(21,23),一个(21)固定,另一个可相对于静止的倾斜。 块体(21,23)在一侧由弹簧状的金属片(20)连接起来。 可倾斜块(23)可以通过转动按压到弹性垫(30)上的螺钉(28)而移动样品(33)。 倾斜块(23)的倾斜发生在金属板(20)的作用下,直到块(23)接触到可插入块(21,23)之间的间隙(24)内的楔(39) 然而由弹性材料组成,其弹簧常数远高于金属板(20)的有效弹簧常数。 在所示的应用中,样品可以下降到连接到精细定位装置(35)上的隧道末端(34)上。