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Signal-to-noise improvement of bio-magnetic signals using a flux-gate probe and real time signal processing

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4 Author(s)
Dolabdjian, C. ; GREYC-CNRS, UPRES-A 6072, ISMRA et Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France ; Saez, S. ; Reyes Toledo, A. ; Robbes, D.

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We have recorded the magnetic signal generated by the human cardiac muscle with the help of a very sensitive flux-gate sensor. First, we have verified the feasibility of such detection inside a magnetically shielded room, then repeated this same experiment within our laboratory and in a low shielded environment. Results have shown the easy operation of a flux-gate sensor for this purpose and the efficiency of fast numerical processing in a low shielded environment. This leads in both cases to a voltage signal-to-noise ratio of about 5 within a 100 Hz bandwidth, which corresponds to the actual limit of the flux-gate probe.© 1998 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:69 ,  Issue: 10 )