GPR - project

[Geophyz]

Seeker,
These types of step frequency GPR systems have been around for a while. Georadar Inc produces a step frequency GPR system commercially called GeoRadar Model 1000B and it also uses spiral antennas.
http://www.georadar.com/

They also own the patent for such devices in the USA.
http://www.freepatentsonline.com/6225941.html

I don't think that your .9-2.4 GHz antenna will be of much use for anybody trying to look deep into the ground. It could be a nice through-wall imager.

Here is a nice article about a similar GPR system developed as a NDT tool.
http://www.ndt.net/article/ndtce03/papers/v090/v090.htm

[Seeker]

Seeker,
These types of step frequency GPR systems have been around for a while. Georadar Inc produces a step frequency GPR system commercially called GeoRadar Model 1000B and it also uses spiral antennas.
http://www.georadar.com/

They also own the patent for such devices in the USA.
http://www.freepatentsonline.com/6225941.html

I don't think that your .9-2.4 GHz antenna will be of much use for anybody trying to look deep into the ground. It could be a nice through-wall imager.

Here is a nice article about a similar GPR system developed as a NDT tool.
http://www.ndt.net/article/ndtce03/papers/v090/v090.htm

Geophiz,
I have not claims to found "hot water" , the princip of FM in radiounits is in use from long time. For example some radioaltitudemeters and low power radars work with FM continuous waves. Spiral antenna is more suitable then other types and this is close to mind.

About patens - everyone can patent what he desire, especially well-known things.
My wish was to show the way for unexpensive homebrew GPR . Too many guys wants to do that and I will help them. Ofcourse I don't publish end schematics.

In fact , 0.9-2.4 GHz is not the best band, but is enough for GPR for 4 m depth.

Best regards

[Geophyz]

Seeker,
You might be interested in this Master's Thesis on the development of a Stepped-Freq GPR transceiver.
http://www.rrsg.uct.ac.za/theses/msc...son_thesis.pdf

[Seeker]

Seeker,
You might be interested in this Master's Thesis on the development of a Stepped-Freq GPR transceiver.
http://www.rrsg.uct.ac.za/theses/msc...son_thesis.pdf

Geophyz,
thank you for link. It is interesting abstract work,but without practice benefit and ornate with theoretical deductions. This is not applicable for homebrew GPR. The diagram is unduly complicated with two sythesizers and IQ-transforming.
So, I think it is good work for Master's degree , but it's not for GPR-amateurs.

Regards

[Functional]

GPR - Project

Seeker,

I don't think that your .9-2.4 GHz antenna will be of much use for anybody trying to look deep into the ground. It could be a nice through-wall imager.

Here is a nice article about a similar GPR system developed as a NDT tool.
http://www.ndt.net/article/ndtce03/papers/v090/v090.htm

Just thought I'd mention a webpage, titled "How Deep Can GPR See?":
http://www.georentals.co.uk/gprsee.htm

A nice page of science and physics bookmarks, with some GPR links:
http://home.comcast.net/~scottxs/ScottsBkmrks.html

And an interesting article from the website of the Microwave Journal, (I'm not a registered member, so I couldn't read all of it):
http://www.mwjournal.com/Journal/art...?HH_ID=AR_1398

Back to the little discussion. I'm not quite certain what the reason is for wanting to see through walls, unless your trying to find treasure in your neighbors house.

As for the GPR topic, I wish I was enough of an electronics guru to build one, but if I was, I'd probably have torn my old cordless phones apart by now, so I could salvage the 900 mhz and 2.4 ghz antenna's and circuitry, in the hope of using it to build a GPR. Well, at least I know which end of the soldering iron is which, (hint: the pointy end it hot).

F.

[Gem Searcher]

"Well, at least I know which end of the soldering iron is which, (hint: the pointy end it hot)."

That is a really good thing!! Keep from burning your fingers that way.

Actually, my interest here has been more in developing a resonating signal by which to identify gems and minerals with. Some of the things presented here have been little tidbits of my puzzle. And I am working on putting them all together into a prototype to start working with. Still a few bugs on the drawing board to figure out yet.

Regards to all

[Functional]

GPR - project

"Well, at least I know which end of the soldering iron is which, (hint: the pointy end it hot)."

That is a really good thing!! Keep from burning your fingers that way.

Actually, my interest here has been more in developing a resonating signal by which to identify gems and minerals with. Some of the things presented here have been little tidbits of my puzzle. And I am working on putting them all together into a prototype to start working with. Still a few bugs on the drawing board to figure out yet.

Regards to all

Gotta protect them fingers.

I don't know if GPR can be modified, or built to allow for gem locating, but then I don't know of anything that can locate gems. Except for some women I've met, who seem drawn to them.

I was actually going to post here about another post I put on TNet about GPR, a DIY Magnetometer, electrical resistivity and several other links for imaging software, etc. The post can be found here:
http://forum.treasurenet.com/index.p...c,61057.0.html

F.

[ruarto]

Great project. Couple quick questions though.
1. What about using surplus or used marine radar for source TX?
2. What about simple version with just beep like normal metal detector, use it for the extra depth radar gives, for finding metal rocks meteorites etc.

[Gem Searcher]

The use of surplus equipment might well be the cheapest way to go to get a built, ready to run gpr unit. Metal detectors, even with the improvements to them in the last several years, aren't enough yet to do specific mineral identification.

For instance, steel, gold, silver, iron ore, nickel ore, hematite, magnetite, meteor fragments, and even aluminum, can all be found by a metal detector because of the resulting EM waves that set up around the metallic elements, which is what the metal detector looks for.

Minerals, such as gems, are non-magnetic in nature and therefore do not respond in the same way. Even to use a gpr to look for them, there has to be a mass large enough to cause a refraction of the em signal waves.

But sometimes, one must try it when there is not a better solution presented.

Good luck.

[Geophyz]

I'm not quite certain what the reason is for wanting to see through walls, unless your trying to find treasure in your neighbors house.

As for the GPR topic, I wish I was enough of an electronics guru to build one, but if I was, I'd probably have torn my old cordless phones apart by now, so I could salvage the 900 mhz and 2.4 ghz antenna's and circuitry, in the hope of using it to build a GPR. Well, at least I know which end of the soldering iron is which, (hint: the pointy end it hot).

F.

Thru wall GPR has many applications. Police and military currently use it to count or detect people behind walls or in adjacent rooms. Engineers use it to map structural problems, ducts, utilities etc.. in buildings. Here is one type:
http://www.ndt.net/article/ndtce03/papers/v090/v090.htm

Here is another military type:
http://www.radarvision.com/SoldierVision/sv.htm

[nader2000]

still waiting

I am following this GPR project for quit some time and I think that I have not seen any understandable schmatic for the project.Is there going to be a workable schmatic.

[Gem Searcher]

I am following this GPR project for quit some time and I think that I have not seen any understandable schmatic for the project.Is there going to be a workable schmatic.

I had been working on several schematics for a device, but other projects have taken priority lately and I have not been working this. My goal is to develop a device that is gem sensitive. So I am having to work towards other means than simple EM waves. I am also depending more on mechanical feedback since I don't know enough about writing code to develop an algorithm program for interpretation of response signals.

[Seeker]

I am following this GPR project for quit some time and I think that I have not seen any understandable schmatic for the project.Is there going to be a workable schmatic.

Of course I will not publish complete shematic.When I start discuss GPR project I declare that. I give only essential diagram , comment some modules or answer any questions you have.You mast yourself design the shematic and it is the goal of this thread.

So guys, if you have some specific technical questions I am online.

[schatzsucher]

can use this part for build an impulsradar?

The Magnetron CWM-50L is made by California Tube Lab.
Operating frequency: 896 / 915 MHz
Output: up to 50 kW, at 88% efficiency
Water-cooled anode, external electromagnet.
L-band industrial CW magnetrons are the predominant high-power tubes for use in commercial microwave cooking, other heating, drying and curing applications, and in plasma generation and linear accelerators.

Model number: CWM-50L
Power kW: 50
Anode kV: 15.0
Anode A: 4.0
Filament V: 12.6
Filament A: 112
Weight lbs/Kg: 15/6.8

Source: http://www.helmut-singer.de/stock/1851705075.html

[Seeker]

[quote=schatzsucher;60272]can use this part for build an impulsradar?


He he he , good joke! You can melt the treasure underground with this monster! Or bake worms and moles

It's cheaper , if you take magnetron from microwave oven. It work at 2,4GHz .
But magnetrons not applicable for GPR.
Any questions?