| 摘要 |
1,202,764. Superconductive elements. T.R.W. Inc. 10 July, 1968 [10 July, 1967], No. 32947/68. Heading H1K. [Also in Division G1] In a magnetometer comprising a superconductive film which is repetitively switched from the normal state (in which it is permeable to magnetic flux) to the superconductive state (in which, due to the Meissner effect, it is impermeable to magnetic flux) and back whereby a detector coil is alternately exposed to and shielded from the magnetic field to be measured, the superconductive film is constituted by a plurality of separate superconductive film areas of approximately the size of a natural superconductive domain and each separate area is surrounded by a respective detector coil connected in series adding with all the other detector coils. As shown in Fig. 2, the superconductive areas 110 are of tin deposited on a heat sink 130 of copper coated on its upper surface with aluminium dioxide. The detector coils are formed by enamelled copper wires 118. A superconductive sheet of niobium or niobium tin alloy 114 is connected to an alternating current source 116 for switching the area 110. Electrostatic shielding is provided by enamelled copper wires 125 connected together at one end.
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