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Offline Ridge RunnerTopic starter
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« Reply #60 on: August 14, 2015, 09:56:33 am »
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Quote:Posted by homefire
   Sampling is one thing but sampling two coils at different times  one getting hit with Fly Back  at different times is not going to work.  Your better off doing Samples on One Coil at different times and averaging them.   If you really want to get fancy,  Sample the First Response from  large coil and Compare to Response from Small Coil.  Both samples taken at the same time.   This may be able to be Constapulated as to Depth or and Size. 


Although there are Deeper machines out there now, my TDI is they only one that can wipe out junk, I'd take that over depth any day.

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« Reply #61 on: August 14, 2015, 10:38:43 am »
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   I refuse to use Discrimination.  It's paid off more then not.  OK, I dig a pile of weird stuff. So What?


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« Reply #62 on: August 14, 2015, 10:42:23 am »
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Quote:Posted by homefire
   I refuse to use Discrimination.  It's paid off more then not.  OK, I dig a pile of weird stuff. So What?



Hunting with A PI you don't have much choice, over here with 5000 years of junk you cant detect a large area using A PI because you can hit 30 targets per sweep.

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« Reply #63 on: August 14, 2015, 10:47:47 am »
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   Then you Dig it all if you want to find it all.

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« Reply #64 on: August 14, 2015, 10:50:32 am »
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Quote:Posted by homefire
   Then you Dig it all if you want to find it all.


Yeah, I have done that too.

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« Reply #65 on: August 14, 2015, 04:02:49 pm »
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Quote:Posted by Lord Dracon
hey X, this is something I've been thinking about for a while now... just seen this post.. lol check out my post (today's) re Surf PI and pinpointed functions and second coil.. lol .. again my main concerns are loss of sensitivty and flyback voltages ... but I'm sure this has a work round 
also if. using 2 samples one on each coil the depth could be calculated ... theoretically... would just need a fast enough chipset/Microprocessor to perform the necessary calculations. as tx fires an initial pulse will register on the RX, then the flyback from the target will register (second pulse) the distance between the two will be your measure of depth....   again just an idea  Idea

The idea of having the second coil to ground(RX) when the TX is on and during the delay time is to eliminate any current from the coil, seeing that I want to have many more turns on the RX coil it will make it perform like a transformer so I cant see any other way of doing it.
Measuring the time that it takes from when you have turned off the TX coil for you to get a signal could be a way of doing it too then the size of the signal(volts) could be used to determine the size of the object.

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« Reply #66 on: August 14, 2015, 04:31:53 pm »
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I don't think that the size of the signal volts will tell you the size as different metals give various flyback voltages, iron being larger. hence the louder beep on the return signal, same with decay these vary too.. but I suppose to an extent, larger items give a louder signal too *shrugs* but I suppose depth is also a contributing factor as items near the surface give a stronger signal than those 10" down .. suppose it would have be a combination calculation based on depth of signal vs signal return voltage = estimated size of object/material ..

sorry, my mind races ahead thinking of a miriad of possibilities.... like if the PI frequency was high enough (which is not really gonna happen) theoretically you could also build up a 3D shape after several passes as long as you could map the ground surface also. but that would take quite a bit of processing power.

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Keep searching ... you might just find it.

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