Matt to Glen....Calling Captain Kirk....

[MattR]

[quote Captain Kirk]Matt

I have respect for you opinion, but I need some clarification

You posted "Ferrite IS Ferrite. REGARDLESS OF THE VARIOUS SIZES, SHAPES AND VALUES OF PERMEABILITY.".

Your statement suggests that any piece of ferrite will cause the metal detector to behave the same regardless of its size, shape and permeability. Am I interpreting that correctly?

I spent many years designing magnetics for switch mode power supplies. There are many many different ferrites. They come in a whole range of permeability (as you suggested)and hysteresis loss values not to mention different shapes. I believe that for a given size and shape of a peice of ferrite, that the permeability will have a significant effect on the imposed magnetic field by metal detector and the response of the metal detector. Do you disagree with that?

HH,
Glenn[/quote]

Hi Glen!

My reply is in two parts.

Glen. You

 

[Captain Kirk]

Matt,

I greatly appreciate your response and the preciseness thereof. I also agree that general statements can give rise to some confusion and sometimes lead to more questions than they answer.

I stated:
I believe that for a given size and shape of a piece of ferrite, that the permeability will have a significant effect on the imposed magnetic field by metal detector and the response of the metal detector.

I should have qualified the "significant effect" part. It would have probably been better to state that the greater the permeability of the ferrite, then the greater the distortion (concentration) of the magnetic field in the ferrite.

Thanks Matt,
Glenn