Abstract
When performing biomagnetic measurements, experimentalists are faced with a two-fold problems very weak signals must be measured in an experimental area where there are disturbing fields which are orders of magnitude stronger than those to be detected. Hence, it is necessary not only to use a sufficiently sensitive detector — and SQUIDs are adequate for most tasks — but also to reduce the detected ambient noise below that of the sensor. This goal can be achieved with heavy magnetic shielding: a well-shielded chamber can reduce ambient noise by more than five orders of magnitude at low frequencies (see Chapter 16). On the other hand, a quite satisfactory rejection of disturbing fields can be obtained for many applications by the use of appropriate geometries for the detection coil. In effect, this approach provides what can be called “spatial discrimination,” since it relies on the coil being sensitive to the field from a nearby biomagnetic source and insensitive to the field from distant noise sources.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1983 Springer Science+Business Media New York
About this chapter
Cite this chapter
Carelli, P., Modena, I., Romani, G.L. (1983). Detection Coils. In: Williamson, S.J., Romani, GL., Kaufman, L., Modena, I. (eds) Biomagnetism. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1785-3_5
Download citation
DOI: https://doi.org/10.1007/978-1-4757-1785-3_5
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-1787-7
Online ISBN: 978-1-4757-1785-3
eBook Packages: Springer Book Archive