northwest Another coil question for Aziz
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Another coil question for Aziz 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Another coil question for Aziz  (Read 726 times)
6666
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« on: Tuesday March 10 2015 14:28:46 AEDT PM »

Hi Aziz

With all your coil testing over the years have you noticed this result?

Take any round mono PI coil, test it, then bend it into an oval shape,
does the oval shape then loose a bit of depth compared to being round
BUT being oval does it increase sightly in sensitivity to small objects ?

Thanks Aziz. 
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Aziz
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« Reply #1 on: Tuesday March 10 2015 17:27:53 AEDT PM »

  
Hi Aziz

With all your coil testing over the years have you noticed this result?

Take any round mono PI coil, test it, then bend it into an oval shape,
does the oval shape then loose a bit of depth compared to being round
BUT being oval does it increase sightly in sensitivity to small objects ?

Thanks Aziz. 


Hi 6666,

yes, if you bend a round mono coil into an elliptical (oval) shape coil, the bent coil must loose some depth and on the other hand, will increase its magnetic field strength at the shorter dimension.
The bent coil is just acting like an equivalent mono coil with the following diameter:
D = sqrt(W*H), where
W = width of the bent coil
H = height of the bent coil
D = diameter of the equivalent round coil

Cheers,
Aziz
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6666
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« Reply #2 on: Wednesday March 11 2015 16:11:47 AEDT PM »

Hi Aziz thanks for the reply much appreciated  smile
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