We set up an electronic gradiometer for magnetocardiography (MCG) in an unshielded environment. The electronically balanced gradiometer consists of high-temperature radio-frequency superconducting quantum interference device (rf SQUID) magnetometers. The rf SQUID magnetometers are arranged to form the electronic first-order, four-vector gradiometer, or second-order gradiometer. The output of the MCG signal was filtered by a band pass (1-30 Hz) and power line filters. We can reduce the noise to ∼1 pT Hz-1/2 at 1 Hz for second-order or four-vector gradiometers. Two-dimensional MCG imaging is demonstrated. The results are discussed with data measured in the moderate magnetically shielded environment.
|頁（從 - 到）||1426-1429|
|期刊||Superconductor Science and Technology|
|出版狀態||已發佈 - 2003 十二月|
|事件||ISEC 2003, International Superconducting Electronics Conference - Sydney,NSW, 澳大利亚|
持續時間: 2003 七月 7 → 2003 七月 11
ASJC Scopus subject areas