Download e-book for iPad: Advances in Biomagnetism by John P. Wikswo (auth.), Samuel J. Williamson, Manfried Hoke,

By John P. Wikswo (auth.), Samuel J. Williamson, Manfried Hoke, Gerhard Stroink, Makoto Kotani (eds.)

ISBN-10: 1461278767

ISBN-13: 9781461278764

ISBN-10: 1461305810

ISBN-13: 9781461305811

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We can now shift our attention to the harder problem of obtaining a description of the biological sources given measurements of their fields. THE INVERSE PROBLEM AND MODELLING Early in our discussion, we described how to calculate a magnetic field from a knowledge of the currents that produced it. We start with a detailed description of both the geometry and the electrical conductivity of the region that has current flowing in it. Given the source distribution J'( r'), where r' specifies the locus of points that spans the conducting region, we can use Laplace's equation and Ohm's law to calculate V( Ti) and J(Ti) everywhere in the conductor.

This part also presents the symbols used in the following. Parts B) and C) of Fig. 4 depict two 22 CD SUPERCOND. v . "i:, li::/::: i SUPERCOND. --' OXIDE LAYER A) B) C) Fig. 4. A) An oxide weak link; B) a point contact, and C) a constriction type weak link in an rf-SQUID. constructions of rf-SQUIDs both having one weak link in the superconducting ring, a point contact screw type weak link (B) or a constriction type weak link (C). Josephson predicted that the super current I. 8 = 82 - 81 : (7) where Ie is the critical current of the weak link.

However, to determine the sensitivity of the system in magnetic measurements, we have also to consider the noise. DC-SQUID. In the dc-SQUID, there are two weak links in a superconducting ring (Fig. 7A). ), as shown in Fig. 7B. A constant current I from an external supply is driven through the dc-SQUID. The average of the voltage < V > across the SQUID is measured. We next calculate < V > as a function of the external magnetic flux introduced into the dc-SQUID through the signal coil L. g of the flux transformer.

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Advances in Biomagnetism by John P. Wikswo (auth.), Samuel J. Williamson, Manfried Hoke, Gerhard Stroink, Makoto Kotani (eds.)


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