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Metal Detectors
General Metal Detector Discussion
Metal detector testing
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<blockquote data-quote="gef12" data-source="post: 309850" data-attributes="member: 926"><p>Air tests and in ground tests... </p><p>Air tests are pretty much a bench mark as where a machine sits in comparison to others whilst in air .. nothing more.</p><p></p><p>In ground tests would be a more proven testing method if comparing apples to apples. And yes greater depths can be achieved on certain targets within ground.</p><p>This is mainly due to what is termed Halo Effect.</p><p>The Halo Effect is a kin to an increase in a targets size on the returning signal to a detector. This is achieved via the differening ground types that consist of minerals, sulfides, salts and acids that lie within the ground. So an oxidising metalic target will create a "Halo" around itself due to acids and the multitude of minerals and salts reacting to it. So you say Gold doesnt oxidise .. correct 100% per gold doesn't.. but we rarely find nuggets that are pure .. they also contain silver, copper and other alloys and also may contain iron stone. </p><p>You may find also that damp ground may increase your detection range due to an increase in the ground conductance. Also as explained previously a target in undisturbed ground will be detected deeper than if the same target were to be placed in the ground at same depth.</p></blockquote><p></p>
[QUOTE="gef12, post: 309850, member: 926"] Air tests and in ground tests... Air tests are pretty much a bench mark as where a machine sits in comparison to others whilst in air .. nothing more. In ground tests would be a more proven testing method if comparing apples to apples. And yes greater depths can be achieved on certain targets within ground. This is mainly due to what is termed Halo Effect. The Halo Effect is a kin to an increase in a targets size on the returning signal to a detector. This is achieved via the differening ground types that consist of minerals, sulfides, salts and acids that lie within the ground. So an oxidising metalic target will create a "Halo" around itself due to acids and the multitude of minerals and salts reacting to it. So you say Gold doesnt oxidise .. correct 100% per gold doesn't.. but we rarely find nuggets that are pure .. they also contain silver, copper and other alloys and also may contain iron stone. You may find also that damp ground may increase your detection range due to an increase in the ground conductance. Also as explained previously a target in undisturbed ground will be detected deeper than if the same target were to be placed in the ground at same depth. [/QUOTE]
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Metal Detectors
General Metal Detector Discussion
Metal detector testing
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