Discrimination for PI's

[Anonymous]

I just had a thought about PI discrimination. Would it be possible to piggyback a vlf type circuit and signal with iron discrimination on the transmit coil of a pi then filter from the pi receiver and then have a seperate circuit for the vlf with all the discrimination circuits. Possibly turning off the vlf during transmit and receive for the PI portion then skip a pi pulse and turn on the vlf. Then use the discrimination to tell you it is iron up to a point that is. Just a thought and way beyond what I could do but I thought I would throw that out there since the forum has kind of slowed down lately. Maybe it is not possible and shows my lack of understanding about all this.
Ray <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt="">

 

[Anonymous]

[No message]

 

[Anonymous]

Hi Ray,
Yes, it might be possible if a balanced coil was used. i.e. a DD or concentric. There are two alternatives - switch between the two modes, or, slot the VLF mode in between P.I. pulses, as you suggest. The latter is probably the more difficult. However, some researchers, myself included, are looking at iron discrimination, using just the P.I. mode by using balanced coil techniques and looking what happens when the TX pulse is on, as well as off.
Don't worry about the previous answer; it's good to have ideas and think about what may be possible.
Eric.

 

[Anonymous]

Thanks Eric,
Just needed verification that my idea was not totally
off the mark. Not sure that I could accomplish it but thought I would put it out there. I dont mind the other comment. Kind of thought the same thing myself in that it would be rather hard to do. Now I will have to do some research on vlf circuits to understand how it could be done.
Ray