Magnetometer to detect minute magnetic filed changes

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How to detect (open to friendly speculations) minute magnetic field changes
?

In application such as;
  * Detecting a crashed small aircraft in a very dense forest from another
small aircraft fliying at a hight of 1000-4000 feet  AGL.
  * Detecting  metal pipe 10-20m below in ground.
  * Detecting a small metal boat sinked to depth of 00-200m from  the
surface of the sea.
  * Detecting earth magnetic field variations from a low orbit atellite or
from a high altitude flying baloon.



Re: Magnetometer to detect minute magnetic filed changes


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Scientific american diy magnetometer project:

http://www.sciam.com/article.cfm?articleID00%0089B4-E29E-1C67-B882809EC588ED9F

follow-up:

http://www.sciam.com/article.cfm?articleID00%0E5AE2-4AAE-1C75-9B81809EC588EF21

It won't be sensitive enough for your applications (or portable),
somewhere to start though.

Re: Magnetometer to detect minute magnetic filed changes


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Do a search on "Proton magnetometer" for some ideas.  There was an
article in a very old Scientific American ( ~1960 ) which gave some
details.  Much more sensitive than the later force balance articles
already cited.   None are very easy to implement.

--
Regards,

Adrian Jansen           adrianjansen at internode dot on dot net
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