EMU sensitivity unit for SQUID magnetometers

[TheDestroyer]

In many, many articles about the SQUID magnetometer, I see people referring to the sensitivity of the magnetometer in units of EMU, as in this article:

http://iopscience.iop.org/0268-1242/26/6/064006

or this

http://link.springer.com/article/10.1007/BF02570388

Could someone please explain what this unit means in the context of sensitivity?

Thank you.

 

[davenn]

hi there

Google is a wonderful thing

http://www.qdusa.com/sitedocs/UnitsChart.pdf

make sure you read the footnotes


cheers
Dave

 

[TheDestroyer]

hi there

Google is a wonderful thing

http://www.qdusa.com/sitedocs/UnitsChart.pdf

make sure you read the footnotes cheers
Dave

Thank you for your response, though I would like to tell you that definitely googling it is the first thing I have done, but it doesn't help, because apparently EMU has many different conventions and I'm looking for something specific used for magnetometer sensitivity.

Magnetometer sensitivity is either measured in Tesla or in Tesla per root Hz $\left(\frac{T}{\sqrt{Hz}}\right)$. I cannot relate EMU to that at all.

Best regards.

 

[davenn]

well its definitions are given pretty clearly in this table with its relationship to Tesla
if that doesn't help, then I cannot help you further

http://users.ox.ac.uk/~sjb/magnetism/units.pdfedit: ... that was the first site that actually told me what emu stood for

cheers
Dave

 

[sardar]

EMU stands for Electromagnetic Unit, which is a unit commonly used in the field of electromagnetism. It is a unit of magnetic moment and is defined as the amount of magnetic moment produced by a current of one ampere flowing in a loop of one square centimeter. In the context of sensitivity, the EMU unit is used to measure the smallest detectable magnetic field that a SQUID magnetometer can pick up. This is known as the noise level or sensitivity of the magnetometer. The lower the noise level, the more sensitive the magnetometer is to small changes in magnetic fields. Therefore, a SQUID magnetometer with a sensitivity of 1 EMU is more sensitive than one with a sensitivity of 10 EMU. The EMU unit is commonly used in SQUID magnetometer research because it is a convenient unit for describing the sensitivity of these instruments.