through the earth...
scale model tests
The purpose of tests with scale models (in a small wash basin) is to confirm some basic principles. By using scale models configurations can be changed rapidly. Also tests can be made with good repeatability as there is more control over the test conditions.
To avoid confusion the term "probe spacing" refers to the spacing between the two individual rods of a probe pair, while "distance" or "range" refers to the distance between probe pairs (i.e., the communication path).
The Scale Model Results
The tests will be added below as they are completed and have a link to the PDF file (left-click to preview; right-click to save):-
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Investigate Assertion that Apparent Resistance remains Constant with Probe Spacing (tap water medium) [PDF - 24Kbytes]
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Second Investigation into Apparent Resistance versus Probe Spacing (tap water medium and putty knives) [PDF - 182Kbytes]
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Investigate Probe Array Configurations (tap water medium and putty knives) [PDF - 111Kbytes]
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Preliminary Field Probe Array Configuration Measurements (backyard soil medium) [PDF - 325Kbytes]
field tests
The purpose of field tests is to confirm some basic principles and earth probe configurations in real earth conditions at longer distances (>20m).
The Field Test Results
The tests will be added below as they are completed and have a link to the PDF file (left-click to preview; right-click to save):-