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德国于利希研究中心的专家,利用液氮冷却Squid(超导量子干涉器)技术,在用高温超导体制成的超灵敏度磁传感器项目上向前迈进了一大步。 因为有了这种新型传感器,“就有可能在世界范围内首次用氮冷却Squid传感器来记录人脑机能的磁信号。”于利希研究中心发言人西格弗里德·魏因霍尔德说:“开发该项目会大大地促进这种传感器用于医疗诊断”。 通过极大地减小固有噪声信号,于利希研制的器件变得极其灵敏,甚至可以测量出小于0.2皮特斯拉的磁感应值。这个值是地磁场的亿分之一,大约是人心脏磁场峰值的1/200。 诚然,目前测量脑电流的通用仪器也能够测量出0.2皮特斯拉的磁感应值。但是,这些仪器采用的Squid是用常规的低温超导体制成的,所以必须使用氦进行冷却,从而造成造价高、控制困难、设施
Experts at the Yuelich Research Center in Germany use liquid nitrogen-cooled Squid (superconducting quantum interference) technology to make a big leap forward in the project of super-sensitivity magnetic sensors made of high-temperature superconductors. Because of this new sensor, “it is possible for the first time in the world to record a Squid sensor with nitrogen to record magnetic signals of human brain function.” Siegfried Weinhold, a spokesman for the URS Center, Said: “The development of the project will greatly facilitate the use of such sensors for medical diagnosis.” By greatly reducing the inherent noise signal, the device developed by Licht becomes extremely sensitive and can even measure magnetic induction values of less than 0.2 Tesla. This value is one hundred millionth of the earth’s magnetic field, which is about 1/200 of the peak of the human heart’s magnetic field. True, the current general purpose instrument for measuring brain currents can also measure a magnetic induction of 0.2 Tesla. However, the Squids used in these instruments are made of conventional cryogenic superconductors and therefore must be cooled using helium, resulting in high cost and difficult control. Facilities