WT metal detector model

[Carl-NC]

so is it possible that I use the current design such as surf or HH to achieve this system and why should I connect the different analog circuit to each Rx? Is it due to the different received signals? Should I set a different threshold value for them? If I want to use this circuit to detect different zones, how can I know if the object is in the left or right?

You can use multiple PI boards, you just sync all the receivers off one transmitter. Each RX coil is a detection zone and has to be processed separately if you want zone information. You could wire them all in series but you won't get zone info and may as well use one big RX coil. Left/right zoning requires a cross-fired system.

Finally, WT RX coils are usually designed as "figure-8" or "butterfly" coils. This is to cancel far-field interference. Here is what a panel might look like:



In a cross-fired system you have 2 panels like this. One side transmits while the other side receives. You then have 6 RX channels to monitor.

[DJSUOL]

Thank you sir. Can you recommend any suitable circuit designs?

[kt315]

[DJSUOL]

Could you please tell me what does 'interpolate' mean? Is it to overlapping some small RX coils to achieve multiple detection zone? In addition, does the current product put TX and small RX in one panel to achieve inductively balance for detection?

[Carl-NC]

Interpolation in a walk-thru is the same as in mathematics. You take 2 adjacent zone and create a fake zone in between them. All in DSP.