S H Liao et al 2003 Supercond. Sci. Technol. 16 1426 doi:10.1088/0953-2048/16/12/023
S H Liao1, S C Hsu2, C C Lin2, H E Horng1,2, J C Chen3, M J Chen3, C H Wu3 and H C Yang2,3
Show affiliationsWe 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.
85.25.Dq Superconducting quantum interference devices (SQUIDs)
Issue 12 (December 2003)
Received 4 August 2003
Published 5 November 2003
S H Liao et al 2003 Supercond. Sci. Technol. 16 1426
Gh Adam and S Adam 2007 J. Phys. A: Math. Theor. 40 11205
Michel Vittot 2004 J. Phys. A: Math. Gen. 37 6337
Sune F Nielsen et al 1999 J. Phys. A: Math. Gen. 32 6757
Jan Naudts and Maciej Kuna 2001 J. Phys. A: Math. Gen. 34 9265
William B Handler et al 2006 Phys. Med. Biol. 51 2479
A I Abramovich et al 2000 J. Phys.: Condens. Matter 12 L627
C S Xiong et al 2007 J. Phys. D: Appl. Phys. 40 3531
R. Hank Donnelly et al. 2001 ApJ 562 254
S Peysson and K Schoutens 2002 J. Phys. A: Math. Gen. 35 6471