PROBLEM TO BE SOLVED: To provide a magnetic field distribution detector, a magnetocardiograph and a metal detector capable of improving sensitivity in magnetic detection by preventing interference between plural sensor heads.SOLUTION: A magnetic field distribution detector 70 includes: plural sensor heads 61 each including a core 62 providing a long slender magnetic path to a magnetic field to be measured and a detection coil 63 wound around the core 62 plural driving circuits 71 each connected to any of the plural sensor heads 61 and a signal generator 64 connected to the plural driving circuits 71 and configured to supply the same frequency to the plural driving circuits 71. Each sensor head 61 is configured as a fundamental wave type magnetic sensor that, with a DC current being passed so as not to generate magnetic noise due to displacement of a magnetic domain wall, passes an AC current having amplitude smaller than the DC current so that magnetic moment is inclined periodically in a circumferential direction.COPYRIGHT: (C)2014,JPO&INPIT【課題】複数のセンサヘッド間の干渉を防止して磁気検出の感度を向上することができる磁界分布検出装置、心磁計および金属検出装置を提供すること。【解決手段】磁界分布検出装置70は、計測する磁界に対して細長い磁路を提供するコア62とこのコア62に巻かれた検出コイル63とからなる複数のセンサヘッド61と、複数のセンサヘッド61の何れかにそれぞれ接続された複数の駆動回路71と、複数の駆動回路71に接続され、複数の駆動回路71に同一周波数を供給する1つの信号発生器64と、を備え、センサヘッド61が、磁壁の移動に起因する磁気雑音が生じないように直流電流を流した状態で、磁気モーメントが周期的に円周方向に傾くように、直流電流より小さな振幅を有する交流電流を通電する基本波型の磁気センサとして構成される。【選択図】図2
