Magnetomodulation superconducting sensor for biomedical applications
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1
Moscow Institute of Electronic Technology (Technical University), BMS, Russia
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2
Moscow University of Printing Arts, Russia
High-temperature superconducting ceramic materials (HTSC) as a rule are granular superconductors, represent "josephson medium" with a high nonlinear magnetic susceptibility in a weak magnetic fields B £ 1 mT. This property is used in magnetomodulation magnetometers (MMM), using as a magnetosensitive elements moderate cylindrical sample (with a diameter 1-8 mm and a length 5-20 mm) made of ceramic HTSC material. MMM principles of operation are analogous those of a flux-gate magnetometer. Using MMM based on the ceramic HTSC permits to measure magnetic field absolute value (both constant and slow changing), they are easy for manufacturing and servicing and have a cost much less then that of HTSC SQUID magnetometers. Pilot MMM models based on ceramic HTSC material of Y-123 system are operating at liquid nitrogen temperature (T ~ 77 К) with sensibility dB ~ 10-11 T and dynamic range D ~ 110 dB [1-2]. MMM characteristics greatly improve on using ceramic HTSC material Bi-2223 system as a magnetosensitive element [3]. Indeed HTSC materials with composition Bi-2223 have higher critical temperature Tc, then that of Y-123 materials. Difference between the critical temperature and the temperature at operations DT = Tc - T in liquid nitrogen is equal DT ~ 30 K for Bi-2223 materials and DT ~ 14 K for Y-123 materials, and this leads to the spectrum noise density decreasing in Bi-2223 in comparison with Y-123, and hence lower dB value in Bi-2223. Furthermore, josephson current density between granules in Bi-2223 materials by T ~ 77 K much higher as in Y-123. Therefore, quadratic component response in it must be presented until far greater external magnetic field values (B* ~ 1 mT) then those in Y-123 materials (B* ~ 0.3 mT). Thus, lower assessed value of sensitivity dB < 10-12 T and higher limiting value of measuring field B* ~ 1 mT in HTSC ceramic Bi-2223 in comparison with those in ceramic Y-123 permit to create on basis of they the MMM with the parameters values dB £ 10-12 T and D ³ 140 dB which are closely related to corresponding HTSC SQUID parameters. Proposed MMM parameters make their attractive for using their in biomedicine applications, in particular for liver, lungs, heart, brain, other internal and tissues and other biomedicine objects in noinvasive diagnostics. Also they can be demanded in various areas of a science and technics, including in not destroyed control of materials and over a magnetic location.
Conference:
Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010.
Presentation Type:
Poster Presentation
Topic:
Instrumentation and Multi-modal Integrations: MEG, Low-field MRI,EEG, fMRI,TMS,NIRS
Citation:
Ichkitidze
L and
Belodedov
M
(2010). Magnetomodulation superconducting sensor for biomedical applications.
Front. Neurosci.
Conference Abstract:
Biomag 2010 - 17th International Conference on Biomagnetism .
doi: 10.3389/conf.fnins.2010.06.00010
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Received:
18 Mar 2010;
Published Online:
18 Mar 2010.
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Correspondence:
L.P. Ichkitidze, Moscow Institute of Electronic Technology (Technical University), BMS, Moscow, Russia, leo852@inbox.ru