Title :
Applying high-TC superconducting quantum interference devices with a room-temperature pickup coil in the measurement of impedance magnetocardiograms
Author :
Kandori, A. ; Tsukamoto, A. ; Suzuki, D. ; Ogata, K. ; Soutome, Y. ; Miyashita, T. ; Seki, Y. ; Yokosawa, K. ; Tsukada, K. ; Takagi, K.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
6/1/2003 12:00:00 AM
Abstract :
A high-TC superconducting quantum interference device (SQUID) magnetometer - in which a room-temperature pickup coil is used to detect an impedance magnetocardiogram (I-MCG) signal - has been developed. The pickup coil (30-mm diameter) is installed outside the cryostat and is connected to the input coil of the high-TC SQUID. The magnetometer´s noise level is 150 fTHz-12/ (>10 kHz). The magnetometer was used to measure I-MCG signals (about 12 pT), which were obtained by applying an ac current (15 kHz) of constant amplitude (7 mA, peak-to-peak) to a healthy male subject.
Keywords :
SQUID magnetometers; high-temperature superconductors; magnetocardiography; high-TC SQUID magnetometer; impedance magnetocardiogram measurement; room-temperature pickup coil; Impedance measurement; Inductance; Interference; Magnetic devices; Magnetic noise; SQUID magnetometers; Superconducting coils; Superconducting device noise; Superconducting devices; Superconducting magnets;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.813866
