IB-PI DISCRIMINATING PICTURES

[Tinkerer]

I am showing here one method of discriminating FE.

picture # 1 shows no target
# 2 shows the response of a lead Minie ball
#3 shows the response of the steel lug of somewhat similar size.

Note how the signal goes negative on the left side as well as on the right side for the lead target, and how it goes positive on the left side and negative on the right side for the FE target.

What will happen if we feed a sample from each side into a summing amplifier?

Tinkerer

[hobbes_lives]

Tinkerer, I'm assuming the left side is "on" and the right side is "off"?

[ZED]

Tinkerer whats with the oscillations at the start of the transmit ?

Zed

[Tinkerer]

Tinkerer, I'm assuming the left side is "on" and the right side is "off"?

Right

Tinkerer

[Tinkerer]

Tinkerer whats with the oscillations at the start of the transmit ?

Zed

Loose cable, I dropped a cannon ball on the coil.

Tinkerer

[ZED]

Loose cable, I dropped a cannon ball on the coil.

Tinkerer

Ouch !!!

Zed

[nick_f]

I am showing here one method of discriminating FE.
What will happen if we feed a sample from each side into a summing amplifier?
Tinkerer

Hi Tinkerer,

That's an interesting idea, for the lead (and hopefully for other non-ferrous metals) the signal will add up while for iron, it will decrease, unfortunately the target may not remain "invisible". I think for the example you provided, it may be better to disregard the second part of the signal alltogether.
Maybe the left signal and right signal could be used together for corellation (if both are slightly negative, it is a stronger hint of a non-ferrous target).

Regards,
Nicolae

[Tinkerer]

Hi Tinkerer,

That's an interesting idea, for the lead (and hopefully for other non-ferrous metals) the signal will add up while for iron, it will decrease, unfortunately the target may not remain "invisible". I think for the example you provided, it may be better to disregard the second part of the signal alltogether.
Maybe the left signal and right signal could be used together for corellation (if both are slightly negative, it is a stronger hint of a non-ferrous target).

Regards,
Nicolae

Hi Nicolae,

This picture is from a while back. The discrimination on these thick targets is easy. However, with thin rusty steel sheet targets, the discrimination is more difficult.

By using separate samples for short TC targets, and long TC targets, separate for FE and gold, the differentiation is much better.

I suggest you build the last version of the TINKERERS_V1. You will be surprised by it's discriminating capability and sensitivity.

Tinkerer