northwest Interesting video, how ferrites can mask gold signals.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Interesting video, how ferrites can mask gold signals. 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Interesting video, how ferrites can mask gold signals.  (Read 683 times)
Doug
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« on: Sunday December 6 2015 08:58:47 AEDT AM »

  
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« Reply #1 on: Sunday December 6 2015 12:28:57 AEDT PM »

  
  
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"Kon61" explanation of whats going on is at best only partially  right. Hopefully someone there will provide a technically more correct explanation eg like discussing nugget time constants and the other factors other than conductivity that influence the time constants and the fact that some nuggets do have higher conductivities than iron!!
  
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Prospector_Al
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« Reply #2 on: Monday December 7 2015 03:36:23 AEDT AM »

  
  
  
doug smile

"Kon61" explanation of whats going on is at best only partially  right. Hopefully someone there will provide a technically more correct explanation eg like discussing nugget time constants and the other factors other than conductivity that influence the time constants and the fact that some nuggets do have higher conductivities than iron!!
  
doug smile

The explanation is actually quite simple:  Ferrite has a high permeability.  It "sucks" any magnetic field into it (the least resistance path) and rarefies the field around it and especially inside a space enclosed by ferrite.  The magnetic field inside the ferrite tube is very weak, because all the flux is concentrated in the walls of the tube.  Any target inside the tube is thereby bypassed by the flux and practically no eddy currents are generated.

In contrast, if you were to put a nugget on top of a SOLID ferrite rod, the response would actually increase.  In the ground, the response could vary.  If you had a depression in bedrock
filled with magnetite, the response would be enhanced, since dispersed ferrite does not shunt the flux around the target.  If, on the other hand, you had a void in mineralised soii, a target in the void would generate less signal owing to the shunting effect.  All this is easy to explore...

Allan

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kazza
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« Reply #3 on: Wednesday December 9 2015 06:59:28 AEDT AM »

Posted in wrong place....
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kazza
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« Reply #4 on: Wednesday December 9 2015 07:01:00 AEDT AM »

This has been discussed before:

    
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authere
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« Reply #5 on: Wednesday December 9 2015 13:07:25 AEDT PM »

Hi All,

What if a coil was to work within a magnetic field given off by a large ferrite surely it would shield out a lot of changing ground noises

Ron
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Interesting video, how ferrites can mask gold signals. « previous next »
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