calculation for coil distance

[ksrctpravin]

hai guys i am doing a project on induction balance metal detector for conveyed application in industry

i am confused with the two receiver coil distance from the single transmitter coil

can any one help me for calculating the distance between transmitter and two receiver coils

[Tinkerer]

hai guys i am doing a project on induction balance metal detector for conveyed application in industry

i am confused with the two receiver coil distance from the single transmitter coil

can any one help me for calculating the distance between transmitter and two receiver coils

We need a little bit more information to be able to help you.

Type of detector - VLF or PI

Size of coils

Size of conveyor belt

What is the target that you want to detect

What is the matrix that contains the target

[porkluvr]

hai guys i am doing a project on induction balance metal detector for conveyed application in industry

i am confused with the two receiver coil distance from the single transmitter coil

can any one help me for calculating the distance between transmitter and two receiver coils

Assuming you are interested in a coplanar coil...

You might benefit from reading the article "Construction of Coplanar Search Coil". Click here and scroll down to the Misc section.

You should also read the 1981 patent US4,293,816 from Whites.

Supposedly, either of these papers should provide you all the information you need, but to be honest I have never sat down and worked either of them.

You mentioned a topology using two rx coils and one tx coil but from my experience the majority of commercial IB detectors with a coplanar coils would have a two tx coil and one rx coil topology. Either topology should work but that does not mean that they will work the same.

Usually the outer coil is tx and a smaller diameter inner coil is rx (with the tx bucking coil wound in proximity) but it could go the other way so long as you apply the principles in those two papers.

You might also be interested in a DD or OO configuration. That is also IB, without a bucking coil. And then there is the co-axial (stacked) coil, and there's more... .

See "Coil Basics", here.

[Carl-NC]

hai guys i am doing a project on induction balance metal detector for conveyed application in industry

i am confused with the two receiver coil distance from the single transmitter coil

can any one help me for calculating the distance between transmitter and two receiver coils

There really isn't any calculation, you use an iterative design. Distance is generally set by the conveyer, so you have to design for that, namely the ampere-turns of the TX and the RX turns. If it doesn't work, crank it up some more & try again!

I'm not entirely sure, but I expect most conveyor detectors are PI; single TX on one side and differential RX on the other. Probably should use bipolar pulsing as well, to further reduce LF interferers. I designed a walk-through using these techniques and it works quite well.

- Carl

[ksrctpravin]

Regar Induction balance metal detector

guys,i am telling about industrial metal detector ,it is a tunnel type or flat type metal detector ,it may be used in food processing or packaging industries,to detect the smallest metal objects


the coil arrangement are RX,TX,RX

i need a formula to find the distance between the transmitter coil and receiver coils

whats is the frequency required in induction balance application with three coil arrangement?

i need to detect a ferrous balls,non ferrous balls and stainless steel as metal objects using metal detector,

i used this metal detector for detecting metals in cotton industry

so guys please help me in this project