In a message dated 01/03/2006, ivey@.......... writes:

The  thermal noise produced by the resistance of the coil would go to zero, 
but  it's unlikely that this is the primary source of noise in most  
seismometers.



Hi there,
 
    Where do you get a room temperature superconductor?  And what is it? Last 
time I looked they had critical temperatures just  above liquid O2, 90 K.
 
    Coil / amplifier low noise combinations are  designed on the coil 
resistance, so if this did go to zero, you would need to  develop a different 
amplifier circuit - not use the same one.
 
    Regards,
 
    Chris Chapman






In a message dated 01/03/2006, ivey@.......... writes:
<=
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  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>The=20
  thermal noise produced by the resistance of the coil would go to zero, but=
=20
  it's unlikely that this is the primary source of noise in most=20
  seismometers.


Hi there,
 
    Where do you get a room temperature superconduc=
tor?=20
And what is it? Last time I looked they had critical temperatures just=20
above liquid O2, 90 K.
 
    Coil / amplifier low noise combinations are=20
designed on the coil resistance, so if this did go to zero, you would need t=
o=20
develop a different amplifier circuit - not use the same one.
 
    Regards,
 
    Chris Chapman