northwest Interesting video, how ferrites can mask gold signals.
Welcome, Guest. Please login or register.
Tuesday January 17 2017 17:47:19 AEDT PM
Home Help Login Register
News: forum firewall bad behaviour Cloudflare Bot scout
Welcome to the Australianelectronicgoldprospectingforum founded in July 2010, an add free totally independent forum with over 70 boards and paid for and managed by the Admin.Total forum Topics:8,578 Total forum Posts:40,000 Members: 612 Total page views:7,258,084 Admin and  forum and domain name owner :marjen at optusnet.com.au. Guests can only see a limited number of boards at present and cannot see any links. Guest cannot post and never will be permitted too!Registration of new members must be approved by admin.Anyone known to have any past or present association with Codan/ML or acting on their behalf as a proxy or intermediary  will not have their registration approved. All  original Photos and posts and  original materials displayed on this site are COPYRIGHTED and remain the property of the poster and the australianelectronicgoldprospectingforum.com. All messages on this forum express the personal views of the author and should not be interpreted as necessarily being in accord with those of the forum owner and neither the owner of this forum and its domain name nor SMF or the forum software developers or the forum host shall be held responsible for the content of any message. Admin reserves the right to remove any offensive or objectionable posts. No defamatory material or politics/religion or issues of race will be permitted.
QED coming soon!
Goldsearch Australia has been appointed the Australian Distributor for the QED.Check their website after  Wed 7th Dec 2016.
Global temperature goes from heat record to heat record, yet the sun is at its dimmest for half a century.
What is empirical  evidence?
Empirical evidence is information acquired by observation or experimentation. This data is recorded and analyzed by scientists and is a central process as part of the scientific method. Why is everything posted on climate by Inhere always horseshit?
Poor old  Inhere on finders still does not know the difference between weather and climate!The silly old goat seems to think because some places have recently had very cold weather that this brings into question  AGW!  Only right wing rabble rubbish climate deniers like horseshit Inhere don't  seem to understand  that AGW will mean that some regions of the earth will become colder!

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 »
Pages: [1] Go Down Print
Author Topic: Interesting video, how ferrites can mask gold signals.  (Read 400 times)
Doug
Administrator
Revered Supreme Hero Member
*******
Online Online

Posts: 14903



« on: Sunday December 6 2015 08:58:47 AEDT AM »

  
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
Doug
Administrator
Revered Supreme Hero Member
*******
Online Online

Posts: 14903



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

  
  
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
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
Prospector_Al
invited members
Hero Member
****
Offline Offline

Posts: 690


Turkish Technology Rocks


« 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

Logged

Süper Altin Dedektör: Exclusive rights for Australia and the U.S.A.
kazza
Newbie

Offline Offline

Posts: 115


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

Posted in wrong place....
Logged
kazza
Newbie

Offline Offline

Posts: 115


« Reply #4 on: Wednesday December 9 2015 07:01:00 AEDT AM »

This has been discussed before:

    
Logged
authere
invited members
Junior Member
****
Offline Offline

Posts: 330


« 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
Logged
Pages: [1] Go Up Print 
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 »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2006-2009, Simple Machines
Simple Audio Video Embedder

BisdakworldClassic design by JV PACO-IN
Valid XHTML 1.0! Valid CSS!