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2" to 3" open center coil?

A

Anonymous

Guest
Hello, folks!
I have a question for the distinguished group of engineers and electronics wizards that inhabit this forum. <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)">
With the understanding that the answer will vary with the machine used, and the assumption that the head will be used exclusively under water, what depth range could one expect from a small coil? (2" to 3" in diameter, open center a necessity: assume that it is wound around a piece of plastic pipe).
Louis
 
Depends on a lot of variables, but the depth range would probably be on the order of 60% of what the same machine would get using an 8 - 9 inch diameter searchcoil. Sensitivity to the tiniest targets would actually be improved.
Depth doesn't decrease in proportion to coil size, because the target itself doesn't shrink at the same time. To a small coil, a given target looks relatively larger in diameter. That makes the response difference less than what one would intuitively expect.
--Dave J.
 
60%? That's probably more than enough for the application at hand...
Thanks, Dave! <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)">
 
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