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日本工业科学和技术局电子技术实验室研制成世界上第一台高灵敏度超导磁场自动检测装置,能成功地检测到人脑对听觉刺激的反应。当离子流经激活细胞内外时,便产生瞬间电流,这种电流使人脑产生磁场,其强度通常只是地球磁场强度的十亿分之一,见图1。显而易见,要检测出如此微弱的磁场,就必须具有效能极高的检测装置。人脑产生的磁场强度极其微弱,大约为11毫微微特斯拉(1毫微微=10~(-15)),新装置完全能测出这一磁场。这一装置由直流超导系统(DC-Squid),操作DC-Squid和读出磁场强度用的电子系统、数字转换器、计算机、声刺激器以及使
Japan’s Industrial Science and Technology Bureau of Electronic Technology Laboratory developed the world’s first high-sensitivity superconducting magnetic field automatic detection device, can successfully detect the human brain to auditory response. As the ions flow through the inside and outside of the activated cells, an instantaneous current is generated, which produces a magnetic field in the brain that is usually one billionth of the Earth’s magnetic field strength (see Figure 1). Obviously, to detect such a weak magnetic field, it must have a highly efficient detection device. The magnetic field generated by the human brain is extremely weak, at about 11 femtoseconds (1 femtocell = 10 - (-15)). The new device can detect this field completely. This device consists of a DC-Squid, an electronic system for operating the DC-Squid and reading magnetic field strength, a digitizer, a computer, an acoustic stimulator,