Slide 1

Low temperature electronic for
Fetal MagnetoCardioGraphy:
FMCG
Wieslaw JASZCZUK & Juergen BUEDDEFELD
Niederrhein University, Krefeld, Germany

Project supported by:
www.aif.de

24.02.03


Slide 2

What is FMCG?

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Slide 3

Magnetic sensors

3


Slide 4

Magnetic sensors & biomagnetic signals
C om p a r is oi n o f e n v iro nm e n ta l d is tu rb a n c e s ,b oi m a g n e t ic f ei dl s
a n d s e n s it iv ity o f s om e m a g n e t ic s e n s o rs
B T[ e s al ]

10

-4

10

-5

10

-6

10

10

B G[ au s s ]

1

10

µT

-7

E a r th m a g n e t ic f ei dl
H a l l sen so r

-2

10
10

-8

-1

10

U rban no ise
-3

-4

C a@
r 50m
10

10

-9

nT

10

-5

L u n g p a r t ic el s
S c rew d r ive r
@ 5m

H um a n h e a r t

-1 0

10

-6

M a g n e to re s is ta n c e
F e ta l h e a r t

10

-1 1

10

-1 2

10

-1 3

10

-1 4

10

-1 5

10

pT

10

10

10
Tf

10

-7

F ul x g a te
AM R -s e n s o r (e x p )
CI ch pi @ 2m

-8

H um a n b ra ni (a pl h a )
-9

-1 0

-1 1

G M R -s e n s o r (e x p e c te d )
H T c-SQ U D
I (e xp )

T ran s is to r
d ei@ 1m

L T c-SQ U D
I (e xp )
C :a\ -w ei \ry s 0\ p ro 1j .s k d

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Slide 5

Bio-magnetic signals
1T= 10 000 Gauss

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Slide 6

What is a SQUID?

Is this the Squid
we want to use?

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Slide 7

What is a SQUID?
The SQUID we want to use !
•Superconducting QUantum
Interference Device
•at 77K (LN2)
• superconductivity

-196°C

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Slide 8

Features of Superconductivity
•Zero Electrical Resistance

•Meissner Effect

•Magnetic Flux Quantization

•Josephson Effect
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Slide 9

SQUID

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Slide 10

SQUID electronic

10


Slide 11

FMCG-future (the Netherlands)

Adopted from BMGC- Uni. Twente, Enschede, NL

11


Slide 12

What is our Goal?

????
12


Slide 13

SQUIDS’ applications?

13