Metal Detector Signal Processing Attn: Engineers and inventors
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  1. #1

    Apr 2008
    Rio Seco
    Minelab Excalibur II
    69
    1 times

    Metal Detector Signal Processing Attn: Engineers and inventors

    My question is has anyone ever tried to process the signal from a metal detector to gain an advantage while hunting? By this I mean looking at the signal from the headphones in the frequency domain or doing time/freq. domain analysis. I have been working on gathering some data from test samples and processing them in MatLab. As soon as I get some results I will post them. What I hope to see is some real difference in the signal when various objects are scanned. If anyone has done anything like this please let me know. I'm using a Minelab Excalibur II.

  2. #2
    mx
    Nov 2004
    Alamos,Sonora,Mexico
    14,603
    11822 times
    All Types Of Treasure Hunting

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    HI don't forget to include the infinite no of alloys.

    Don Jose de La Mancha
    "I exist to live, not live to exist"

  3. #3

    Apr 2008
    Rio Seco
    Minelab Excalibur II
    69
    1 times

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    I don't think that the detectors can tell the difference between say 6061-T6 Al & 5086-H32. I just doubt that they are that sensitive. So the "infinite no of alloys" will not be the main obstacle. Let me know if you know different.

  4. #4
    us
    Feb 2008
    Central MA
    Minelab Sovereign GT
    477
    9 times
    Banner Finds (1)

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    Absolutely. Just had my GT hooked up to a National Instruments ADC yesterday.
    You will be surprised to "see" the differences in signals a Minelab will produce.
    I've made a 0-180 Pic controlled meter for my GT and am developing a "audio cross check" function to try to better my design.
    Good Luck

  5. #5
    us
    Feb 2008
    NE Louisiana
    Whites Eagle Spectrum, XLT Fisher's CZ5 Garretts GTA 1000
    571
    10 times

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    Tag
    La défaut du mien! La Beep

  6. #6
    us
    Dr.

    Nov 2006
    Vicksburg, MS
    Geonics EM61-MK2, Geophex GEM-3, GapEOD UltraTEM III, Minelabs F3, Foerster MINEX 2FD 4.500
    78
    10 times
    All Types Of Treasure Hunting

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    This is a very important research area for landmine detection and unexploded ordnance detection and discrimination. Look at the papers from the SPIE meeting in Orlando every year. DoD is currently funding lots of universities for the modeling and signal processing work (Duke, University of British Columbia, Colorado School of Mines, Dartmouth, MIT). I use Matlab as well as National Instruments hardware and labview for this type of research at work and for my PhD. This was pone of the main topics of discussion at the magnetoc soils workshop I was at in Cranfield, UK a few weeks ago. The main problem is that consumer metal detectors don't provide enough information to do this effectively. Geophysical sensors such as the Geophex GEM-3, in the frequency domain, or the Geonics EM63, in the time domain, are approaching what is necessary. If you are interested in this subject let me know and I can give you a reading list to get started.
    Ryan E. North
    Research Geophysicist

  7. #7
    mx
    Nov 2004
    Alamos,Sonora,Mexico
    14,603
    11822 times
    All Types Of Treasure Hunting

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    Good morning 99: Waiting for the data Interesting subject.
    "I exist to live, not live to exist"

  8. #8
    AUCTIONEER

    Jul 2006
    Charlotte
    Primary detector is a Garrett AT Pro Also have a Garrett Ace 250
    679
    19 times
    All Types Of Treasure Hunting

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    Yeah, them danged ol' signals and when you're a' processing them and a coming up with figgers and a running them through them things that make 'um do that thing, ta what ya call "inhance" the ding - ping - pong sounds, and then you got something............

    eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeyep.

    You 'uns is right smart folks....

    HH,
    Ramapirate
    Ramapirate...
    Madcap

  9. #9
    us
    Feb 2008
    Central MA
    Minelab Sovereign GT
    477
    9 times
    Banner Finds (1)

    Re: Metal Detector Signal Processing Attn: Engineers and inventors


    Hey Ramapirate
    I don't if I should laugh or if I should be P/Oed.

  10. #10
    AUCTIONEER

    Jul 2006
    Charlotte
    Primary detector is a Garrett AT Pro Also have a Garrett Ace 250
    679
    19 times
    All Types Of Treasure Hunting

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    I hope you are laughing!!! Everytime I have people telling me how much I know about computers and radio equipment and freqs and mods and stuff(which I don't really know that much, just enough to be dangerous) I read something like this that buries me and makes me feel like I need to get out my blocks and footy pajamas. No chance of me ever getting the big head with you guys around.

    HH,
    Ramapirate
    Ramapirate...
    Madcap

  11. #11
    AUCTIONEER

    Jul 2006
    Charlotte
    Primary detector is a Garrett AT Pro Also have a Garrett Ace 250
    679
    19 times
    All Types Of Treasure Hunting

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    And trust me Radarwill, I was talking in first person. I'm the dummy in this equation...

    HH,
    Ramapirate
    Ramapirate...
    Madcap

  12. #12
    BIG61AL

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    You'll have to take in the fact that many targets will send a signal to the detector that is false. A large copper coin laying flat will be read as a good target but so can a chunk of aluminum. Jewelry is another issue. While silver and gold will generally give a consistant signal the wide range of alloys used in jewelry production and the overall various shapes they come in will also cause false signals. This is certainly a very difficult undertaking and I wish you much success.

  13. #13

    Apr 2008
    Rio Seco
    Minelab Excalibur II
    69
    1 times

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    Quote Originally Posted by Dell Winders
    Quote Originally Posted by SFLOcenEng
    My question is has anyone ever tried to process the signal from a metal detector to gain an advantage while hunting? By this I mean looking at the signal from the headphones in the frequency domain or doing time/freq. domain analysis. I have been working on gathering some data from test samples and processing them in MatLab. As soon as I get some results I will post them. What I hope to see is some real difference in the signal when various objects are scanned. If anyone has done anything like this please let me know. I'm using a Minelab Excalibur II.
    Here's a possible start. It's commonly used and conventional. Converting audio frequency to numerical data. Enter the numerical data into Geophysical software to obtain a computerized graphic image. Dell

    LINK to Arc-Geo Metal detector imaging systems: http://www.lrlman.com
    Dell your confused and this is beyond the scope of your understand!

  14. #14
    NGE
    NGE is offline
    us
    May 2008
    S.E. Michigan
    Etrac, Explorer XS II, Fisher 1266-X
    3,503
    115 times
    metal detecting, fishing, photography

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    I think I somewhat unnerstan' what ya all is talking about. When I was working at a Ford dealership back in 1984, there was this guy who was a former Radio/TV tech. And he shared with me something he was working on. He had an old metal detector with an oscilloscope hooked up to it, and he showed me how different metals had different wave lengths, but he hadn't figured out how to power it in the field. In the 60' and 70's I was into CB and Ham big time, and knew all about wavelengths pertaining to frequencies, but, my brain is fried and all I can remember is that 9 feet make one wavelength, and a full wavelength worked better for transmitting. I could wrap 18 feet of wire on a 9ft. antenna and have 3 full waves, therefore allowing me to talk further than the standard 9ft. stainless whip antenna. (wrapped at bottom) into a coil.............NGE
    Exposure to the Son prevents burning

  15. #15
    us
    Oct 2009
    Northern VA
    Whites Blue Gray & Tesoro Cibola
    2,737
    15 times

    Re: Metal Detector Signal Processing Attn: Engineers and inventors

    Quote Originally Posted by Ramapirate
    I hope you are laughing!!! Everytime I have people telling me how much I know about computers and radio equipment and freqs and mods and stuff(which I don't really know that much, just enough to be dangerous) I read something like this that buries me and makes me feel like I need to get out my blocks and footy pajamas. No chance of me ever getting the big head with you guys around.

    HH,
    Ramapirate
    Don't worry Ramapirate you aren't alone

 

 
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