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    • 16. 发明授权
    • Low-noise SQUID
    • 低噪声SQUID
    • US6023161A
    • 2000-02-08
    • US32171
    • 1998-02-27
    • Eugene DantskerJohn Clarke
    • Eugene DantskerJohn Clarke
    • G01R33/035G01R33/02
    • G01R33/0354Y10S505/846
    • The present invention comprises a high-transition-temperature superconducting device having low-magnitude low-frequency noise-characteristics in magnetic fields comprising superconducting films wherein the films have a width that is less than or equal to a critical width, w.sub.C, which depends on an ambient magnetic field. For operation in the Earth's magnetic field, the critical width is about 6 micrometers (.mu.m). When made with film widths of about 4 .mu.m an inventive high transition-temperature, superconducting quantum interference device (SQUID) excluded magnetic flux vortices up to a threshold ambient magnetic field of about 100 microTesla (.mu.T). SQUIDs were fabricated having several different film strip patterns. When the film strip width was kept at about 4 .mu.m, the SQUIDs exhibited essentially no increase in low-frequency noise, even when cooled in static magnetic fields of magnitude up to 100 .mu.T. Furthermore, the mutual inductance between the inventive devices and a seven-turn spiral coil was at least 85% of that for inductive coupling to a conventional SQUID.
    • 本发明包括一种高转变温度超导器件,其在包括超导膜的磁场中具有低幅度低频噪声特性,其中膜具有小于或等于临界宽度wC的宽度,其取决于 环境磁场。 对于在地球磁场中操作,临界宽度约为6微米(μm)。 当以约4μm的膜宽度制造时,本发明的高转变温度超导量子干涉装置(SQUID)排除高达大约100微特斯拉(μT)的阈值环境磁场的磁通涡旋。 制造具有几种不同胶片条形图案的SQUID。 当膜条宽度保持在约4μm时,SQUIDs在低频噪声基本上没有增加,即使在静态磁场的温度高达100μT的情况下被冷却。此外,本发明的装置和 与常规SQUID的电感耦合相比,七圈螺旋线圈至少为85圈。