| 摘要 |
PURPOSE:To prevent a noise signal from being generated owing to the movement of a detection coil by providing a conductor which has a small resistance value in an intense magnetic field and holding the detection coil at a fixed position with a force which operates on the conductor with an eddy current. CONSTITUTION:A supporter 18 is arranged fixedly in the intense magnetic field and ring-shaped detection coils 14 and 15 are fitted and fixed to the lower part. Further, a sample holder 16 where a sample 17 is set at the tip is inserted into the internal hole in a freely forward/backward movable state, and conductor rings 19 and 20 are embedded in the supporter 18. When vibration of the detection coils caused by the position shift of the sample 17 is transmitted to the fixed conductor rings 19 and 20, the eddy current is generated by the effect of the magnetic field, and consequently the strong stationary force operates on those rings 19 and 20. This force operates so as to fix the supporter 18, so the detection coils 14 and 15 united with the supporter 18 are held at constant positions.
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