northwest Coil Depth Potiential..?
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Coil Depth Potiential..? 0 Members and 1 Guest are viewing this topic. « previous next »
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mylab
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« on: Wednesday June 8 2016 15:18:55 AEST PM »

I have been following a thread on another forum in regards to the DOD type coil.
There is a difference of opinion as to what determines the depth potential of that coil. 

Therefore I am seeking input from those here in regards to a coil's Tx (transmit) and Rx (receive) windings.

Is it the size(dimension or diameter etc) of the Tx windings or the Rx windings that determines the depth potential of a coil?

Or is there to many variables to give a definite answer comparing a Mono to a DOD?
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Doug
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« Reply #1 on: Wednesday June 8 2016 15:36:07 AEST PM »

  
I have been following a thread on another forum in regards to the DOD type coil.
There is a difference of opinion as to what determines the depth potential of that coil.  

Therefore I am seeking input from those here in regards to a coil's Tx (transmit) and Rx (receive) windings.

Is it the size(dimension or diameter etc) of the Tx windings or the Rx windings that determines the depth potential of a coil?

Or is there to many variables to give a definite answer comparing a Mono to a DOD?

The Tx field in my opinion is the most important.To detect large deep objects you need a "big" Tx field.The bigger the diameter of the coil (other factors being equal) the bigger the field. On the RX side  S/N is also important. A good example of the importance of the TX coil diam is to look at those used for Geophysical prospecting for ore bodies.You will see very large diam Tx coils but the Rx coils nearly always have a much smaller diameter.
eg see :   
doug smile
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mylab
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« Reply #2 on: Wednesday June 8 2016 17:27:42 AEST PM »

Would those geophysical type coils be a concentric design?

I wonder if the same applies to the DOD design in regards to the Tx coil still having to be larger, since the area covered by both DD type coils used to receive in the DOD design could have more influence on the depth potential than its Tx coil size?
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Doug
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« Reply #3 on: Wednesday June 8 2016 21:53:30 AEST PM »

  
Would those geophysical type coils be a concentric design?
Yes many are but some also have  bucking coils and Rx coils to receive orthagonal signal components.
here is the link to a picture of the skytem TX and 2 RX coils    
doug smile
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mylab
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« Reply #4 on: Thursday June 9 2016 09:58:44 AEST AM »

Thanks Doug for the link. 

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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Coil Depth Potiential..? « previous next »
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