Metal Detector Discrimination
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- čas přidán 9. 09. 2024
- This video is about Metal Detector Discrimination first principles. It shows how ferrous metals alter the phase relationship between the transmit coil and a receive coil. This change is what discriminating metal detectors use to reject iron finds which are usually low value.
I am thinking of that difference due to the shape of the metal. Box is not the same as cylinderical shape under magnetic field
Extremely useful bit of info thanks for sharing!
The "surprise" part was very interesting.
great video. i would like to see the same demo but with pulse induction
Try 2 rx coils in a balanced bridge circuit and 1 tx coil. B field is proportional to the number of turns, holding current constant. So, for max sensitivity/depth, use lots of turns.
Use a Wide BPF (so it won’t ‘ring’) around F1 (10 kc?) to max the S/N and amp.
Now, balance out the coils in a bridge circuit detector (very sensitive). Any perturbation will be detected.
Now - Peak detect and phase compare, putting the phase delta into a clocked memory triggered by the peak detect.
Each phase relates to a particular metal.
A lookup table could type any unknown sample against known looked up.
Use a constant current drive source to ‘normalize’ all readings for a constant B field and make it big for a big field (max depth).
Set it for gold and send me my finders fee!
How about if you design something and I'll use your detector and give you a good amount of $$$ ?
@@samk.9972 I read what you said and... I've invented a better technology to replace copper wiring in coil search disks. Would you be interested in a partnership?
Why?
I am no one in this world and have nothing that anyone would care about (including family and friends). The only reason I've learned of this "technology" is because of my interest in Metal Detecting and learning about precious metals here on CZcams. With each topic I found something very interesting and I found when you combine these 2 concepts, you don't need copper wiring. To be honest I can't believe someone didn't already think of it. So as to the "Why"? I need help. I know I've come up with something very unique, versatile, patent-able, and perform-able vs copper wiring, but I don't know what to do with it. Take the reigns for me and lets form a partnership.
Good morning
Thank you for your videos,
Can you suggest needed equipment and tools for DiY metal detector
Hello! how are you?. Excellent images of the video. It's a pity that I can not understand English very well. Would there be any chance that you could activate subtitles in other languages? Thank you.
I know this is an old video, but could you elaborate on the physical setup you use here? I'm guessing it is just a sine wave applied to the transmitter coil?
@@RikTheMix thank you for the information!
Happy hunting
sir, how to set up the experiment?
Hi, i want to know if you succeded in finding anything important about this topic. because i'm working on a project in which i try to create a beat frequency oscillator. i succeded in detecting metals thanks to this method but i'm working on improving it by adding the discrimination factor. But i don't know how to make a system that will do the job of discrimination. If you have any thoughts on this or anything related i'm all ears .
hey Friends i am also working same project, can i get your project detail. thanks
@@kazmabi728 Merhaba. Coillerin nasıl bağlandığını anladıysan benimle de paylaşabilirmisin :)
What type of detector is this? BFO?
Looks like a VLF setup, using a signal generator that transmit through the large coil and a smaller receiver coil connected to an oscilloscope. It works by detecting the signal reflection from the target metals. It also discriminates by detecting a phase shift on the received signal.
BFO, as far as I know only detects a change of inductance and cannot discriminate.
as a layperson trying to understand how metal detectors work, your presentation was a bit beyond my comprehension. i don't know the meaning of what i'm seeing on the screen.