Bob,
Researchers are trying to use them to 3 dimensionally map the activity
(current flowing) in the brain. It is my understanding that the work is
going very slowly because this puts them right at the noise floor of SQUIDs.
Human beings barely affect the earth's field, plus in an outside environment
the earth's magnetic field is too energetic in comparison to the human body
to be able to see the body.
- Robert -
PS Last comment ON the newsgroup to this unrelated topic.
However there may come a day when we'll have to meet "Quiet Room" specs to
be used for mapping electrical brain activity. And those specs are going to
make a chamber look like a sieve.
-----Original Message-----
From: Robert Tims (EMX) <emxrt...@am1.ericsson.se>
To: 'Robert Macy' <m...@california.com>
List-Post: emc-pstc@listserv.ieee.org
Date: Tuesday, January 25, 2000 9:40 AM
Subject: RE: Magnetic field immunity in the Arctic regions
>Hey,
>can those things detect a human's effect on the magnetic field (or even a
>human's own magnetic field)? Would make a nice Search and Rescue tool if it
>did, for avalanches or earthquakes or whatnot, or even a good weapon!
>BR,
>Bob Tims
>Compliance Engineer
>
>> -----Original Message-----
>> From: Robert Macy [SMTP:m...@california.com]
>> Sent: Tuesday, January 25, 2000 11:42 AM
>> To: Tom Cokenias; Peter Poulos; emc-p...@ieee.org
>> Subject: Re: Magnetic field immunity in the Arctic regions
>>
>>
>> Don't need SQUIDs to read earth's field. Fluxgates have enough accuracy.
>> And the earth's natural noise floor is well above the SQUID so you don't
>> need to pay for all that extra. Remember, SQUIDs can observe the current
>> flow as metal rusts.
>>
>> Check out Geometrics. They use the decay of the electron orbits in a
>> Cesium
>> atom (I think) to read magnetic field to 12 digits, yes that's 12 decimal
>> digits. I watched the readings shift as a greyhound bus drove by
>> deflecting
>> the earth's magnetic field over a city block away.
>>
>> - Robert -
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