To John in Florida, and all the happy lemonade drinkers. Despite squeezing the lemon, it will never produce Champagne, but you may get a lot of pips i

[MattR]

QUOTES:-

Posted by: John, in Florida <Send a PM> (IP Logged)
Posts: 1830
Date: September 09, 12:10PM

'MattR'
"The moment you expect to detect and analyze a one inch diameter coin, at a depth greater than the coil's diameter (in inches), then you are in denial of both common sense and the laws of physics, as related to balanced induction principles, and the real world environment of noise and soil."

'John'

The Explorer I had could detect a coin at a depth greater than the diameter of its coil. The detector I use now can do the same. There is no law of physics which says a detector can't do it.



John, in Florida

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Thanks John for your input re. detecting 'a coin' at a depth greater than the diameter of the EXP's head.

I accept the generality of your statement, but as an accurate example of 'an exception to the rule', I must protest that it does not clearly prove your point.

your reply lacks details, to my reasonably defined assertions,

What was the coin?
What was its diameter?
What was it's DUAL VDI at that depth.
What is the coin's VDI in air?

For an Explorer's find to qualify as being detected AND ANALYZED (reasonably accurately), then I would expect such detail to be provided.

I agree, you can DETECT a coin in excess of the head's diameter, ( as in ALL METAL mode), but to analyze it reasonably well, is a far more demanding property.

The 'laws of physics' to which I refer, are those APPLIED to the proposals stated, not their definition. They are universally applicable to many situations in the science of electro-magnetic induction.

As an example:- The BIOT SAVART law may be used to find the field strength at any point on the axis of a coil.

With that as a starter, you must then consider the current induced in a target for the frequencies involved.

You then extrapolate the 'reflected' re-action, using transformer principles.

Back at the search-head, you then standardize the detector's set-up.

Sensitivity, etc., for an output level containing only the detector

 

[John in Florida]

Matt, thanks for the reply.

How much analysis do you need before you dig something?

Any experienced ML XS user with a 5" coil can tell you that they have found many coins deeper than 5" and it gave a good coin signal. That's my only point.

Personally, using my 5", I have found US Dimes at about 7" deep. They are a tad under .75" in diameter so that blows your theory to pieces. No, my before digging analysis did not tell me the date or type of Dime. It did indicate it was a high conductive and round target, though, which is all that is really needed.

It's been my experience that it's very hard to explain why the ML XS does so well. Few can match its ability to pull silver out of old areas.