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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 9 — Sep. 1, 2007
  • pp: 2357–2362

Cesium coherent population trapping magnetometer for cardiosignal detection in an unshielded environment

J. Belfi, G. Bevilacqua, V. Biancalana, S. Cartaleva, Y. Dancheva, and L. Moi  »View Author Affiliations

JOSA B, Vol. 24, Issue 9, pp. 2357-2362 (2007)

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We present encouraging results obtained with an experimental apparatus based on coherent population trapping and aimed at detecting a biological (cardiac) magnetic field in a magnetically compensated but unshielded volume. The work includes magnetic-field and magnetic-field-gradient compensation and uses differential detection to cancel common mode magnetic noise. Synchronous data acquisition with a reference (electrocardiographic or pulse-oximetric) signal makes possible improvement of the signal-to-noise ratio in off-line averaging. The setup has the significant advantages of working at room temperature with a small-size head, and the possibility of fast adjustments of the dc bias magnetic field, which makes the sensor suitable for detecting a biomagnetic signal at any orientation with respect to the axis of the head and in any position on the patient’s chest, which is not the case with other kinds of magnetometers.

© 2007 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(230.1150) Optical devices : All-optical devices

ToC Category:
Optical Devices

Original Manuscript: March 30, 2007
Revised Manuscript: June 20, 2007
Manuscript Accepted: June 22, 2007
Published: August 23, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

J. Belfi, G. Bevilacqua, V. Biancalana, S. Cartaleva, Y. Dancheva, and L. Moi, "Cesium coherent population trapping magnetometer for cardiosignal detection in an unshielded environment," J. Opt. Soc. Am. B 24, 2357-2362 (2007)

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