| 摘要 |
A biomagnetic measuring installation has a chamber formed by a number of spaced layers of mumetal within which a measuring cryostat and a patient support table are disposed. The chamber is contained within a room. The installation is supported on a foundation base, which is in turn seated on a sand bed. The layers of the base of the chamber have recesses therein through which a first set of posts extend from the foundation into the chamber, to which a frame which supports the measuring cryostat is secured. A second set of posts extends from the foundation into the chamber to which the patient support is secured. Mechanical vibrations emanating from the patient, or from an attendant walking on the base of the chamber are transmitted to the measuring cryostat only through the very large and thus inert mass of the foundation base. The same is true for external mechanical jolts. As a result, the measured results have a low sensitivity to mechanical influences.
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