GPR - project

[Jaxom]

If you're willing to go slowly, I am by no means an engineer, I barely know how to use my multimeter. But I must be very specific, as I've already done some research on GPR units, unless it can detect from surface level down to 12" without distorting, it would be basically useless to me.

Application would be on a small to medium robot that will automatically search a pre-programmed area. I mainly coin shoot in near my home, but also would like to take gold prospecting areas in the SW US.

Jaxx

[Seeker]

So, the GPR dimensions are antennas module 50x50x70cm , main unit 30x20x20cm and laptop.Laptop can be install away from GPR , using wireless connection.
But you mast have little EE experience to begin to make GPR.

[Jaxom]

I've some experience with building things, nothing very complicated though. And i am working with an EE online as co-partner in the robot design as well.
I am having to learn alot, since that I will be building that actual robot along with all the electronic componants that will be installed onto it.

Problem though is, that antenna is a bit large for my application. Must be smaller. Say 11cm x 11cm x 45cm. For two reasons, a large antenna won't be able to go into tighter spaces and weight, a heavy antenna will be a drain on the motors propelling the unit.

I'd really like to see a schematic of what you've got or some pictures of what you've built and tested.

Thanks,

Jaxom

[Seeker]

Hi, the antenas can’t be smaller for this frequency. The weight of antenas is 1,5kg. There are 5 antenas in one body.

About schematic – you may be know what is the price of common GPR – more then US$15000.
When I start to develop this GPR , I invitate anybody in this forum to join in this project, but no one want. I promise I never give schematic or some specific information.Too many guys looking for a finished schematics of new units for mercantile purpose .
If you want build GPR, I will help if you have problem or discuss something, but schematic will be yours. I give enough information in this thread to begin design.

Best regards

[stepegold]

Lets say you get the gpr built, What about the software?

[Seeker]

Lets say you get the gpr built, What about the software?

Hi , I am EE, not programer. I develop two types of GPR , first without software, only RGB LED's to indicate passing conditions; second with software on laptop, GPS, wheel , geodetic level and compas .
The first is for low level skills EE or amateurs, the second is profesional unit for underground work.
If you read all thread , you can understand principle of work .

[Seeker]

Lets say you get the gpr built, What about the software?

So, what you think about the hardware interfaces between GPR and laptop?

[Unregistered]

Glad to find this forum

I am really glad to find this thread on GPR research. I have been trying to do research to find a way to make a GPR unit that can detect gems and other elementals. I too have reasoned that resonant frequencies should be used so as to be able to customize the unit to individual elements and stones such as quartz, peridote, garnet, and others.

My search parameters for such elements only require that I search down to about 2m for any of them. Also require that the unit be more or less handheld like a common metal detector. And that it will only home in on one element at a time and show depth by the use of a comparitor circuit. Perhaps with some more research and eventual experimentation, a unit that would identify 2-5 different elements in the same scan could be developed. I would like to hone the sensitivity to the point where it would register on gems of 1/4 carat size and larger, at least to a depth of 1m.

Any help, suggestions and cooperative analysis is greatly appreciated. You will find me later, as soon as I get approval, under the name Gem Searcher.

[Seeker]

Hi Gem Searcher, it is very big challenge to develop gem detector, I don't know about similar detectors.
In this thread I consider one type of GPR, where sweeping frequency is used to define distace to target.But target can be metal,stone or something reflected RF-waves.
In your sugestion have some new ideas to search.
So ,to develop this unit I need to make many investigations in gems and theirs properties.

[Gem Searcher]

I've been looking into the molecular magnetic resonance freq. of various minerals and elements. I have found a reference of these based on 100MHz testing. But I think it was with a contact probe. Can't seem to find any units premade for this though. At least not one that doesn't take a small house to hold it.

For gpr purposes, I am wondering if these resonant freqs. can be found using 900Mhz. Or perhaps 3Ghz.

[Gem Searcher]

Just bouncing ideas here. Wondering how uwb might work? Directed? Pulsed with a variable receiver circuit. Low watt so as to prevent interference with local rf receivers.

For molecular resonance, would probably need a high gain helical receiver(x4) into an amplifier circuit. Use a center target pattern on a 2.5 x 2.5 cm display.

For software purposes, use a flash bios chip, so that the software could be changed as necessary.

[Seeker]

For UWB-based unit I have not equipment. Somewhere I found that molecular resonance can be reach at terahertz waves, between 500 to 10 micron.
This theme is very interesting, I have some books writen in early XX century;but after '50 years ,these books had stamp TOP SECRET and there are no more information about distant anlysis.
In our days some frauds produce and sell LRL or GPL , but there are nothing theoretically substantiated or working units.

[Valchev]

May be will be interesting: European Patent EP0512345 "Method and apparatus for one sided magnetic resonance imaging"

Accordingly, it is an object of the present invention to provide a method and apparatus for performing nuclear magnetic resonance imaging of a volume of observation from one side of the sample volume.

It is another object of the present invention to provide a method and apparatus for performing nuclear magnetic resonance imaging in geological applications.

It is a further object of the present invention to provide a method and apparatus for performing nuclear magnetic resonance imaging of the earth removed to one side of the apparatus.

It is a further object of the present invention to provide a nuclear magnetic resonance imaging technique which can detect nuclear magnetic resonances over 20 meters from the receiver coils.

It is another object of the present invention to provide a high speed method and apparatus for nuclear magnetic resonance imaging from one side of the volume under observation.

[Seeker]

The NMR technology require very strong magnetic field , for 20m range the intensity of magnetic field will be so strong ,that will destroy NMR unit I think at this patent only the name is NMR

[Gem Searcher]

I agree with Seeker. Your pics show that you have constructed a very good portable GPR. But the magnetic current that would be required for it to be an effective MRI with the images you show, would yank anything with the slightest bit of iron or nickel right off of you.