GPR - project

[Seeker]

Happy New Year For All Forum Members!

[Gem Searcher]

Peltier modules are good as heat removers for electronics. Would probably work well for a lab based device, but how about a portable handheld device? Wouldn't they use up a lot of battery power?

I've been working specifically on a solid state timing device that can handle 3500vdc for an EV Gray motor. This is to control the rpm's for generation of household electricity.

[Seeker]

Peltier modules are good as heat removers for electronics. Would probably work well for a lab based device, but how about a portable handheld device? Wouldn't they use up a lot of battery power?

Yes, it have big consumption of power, but nothing better device is invented yet.
I use 20W two stages TEM to remove heat from sensor, temperature of sensor is -30C , it is enough to my unit. I have good temperature insulation and noncontact cooling system ; when I stop TEM , temperature decrease from -30 to -25C for 50 minutes.

[Gem Searcher]

What size wire would you use for the receiving antennae for a Thz receiver? I am thinking about a pc mounted spiral that is .01-.05mm wide trace. Copper(CU) or gold(AU)?

[Seeker]

It is not a wire, antenna is chemical substratum with physical effect when absorb THz waves.

[Unregistered]

GPR-project

For gpr best freqency range is from 100Mhz to aprox. 2,4ghz.Lower f has the depth,but a poor resolution.For 100Mhz range resolution is 1/4 to 1/2 of wave ,aprox. 0,8 to 1,5 meters.The 2,4Ghz range has the best resolution 6cm,at these ranges soil absortion is becoming to high for practiclal use.Bigest problem is the water content of the soil,ower 20-30% whil reduce signal to under 10%.For general purpose 1Ghz sems best.Mineral content is olmost the crucial,clay as wid MD.Military sistems are a good exampl for a begining.A nother good tehnic is a passive microwave radiometric reciver.

[Morgan]

Two Box ?

For gpr best freqency range is from 100Mhz to aprox. 2,4ghz.Lower f has the depth,but a poor resolution.For 100Mhz range resolution is 1/4 to 1/2 of wave ,aprox. 0,8 to 1,5 meters.The 2,4Ghz range has the best resolution 6cm,at these ranges soil absortion is becoming to high for practiclal use.Bigest problem is the water content of the soil,ower 20-30% whil reduce signal to under 10%.For general purpose 1Ghz sems best.Mineral content is olmost the crucial,clay as wid MD.Military sistems are a good exampl for a begining.A nother good tehnic is a passive microwave radiometric reciver.

Hello

I would like to know if someone here as schematic of this coin locator.

Regards

[Gem Searcher]

Interesting use of pvc. The ends are 2"x1" tees on about 3' of pipe leading to what looks to be threaded adapters on a 2" pipe mounted on top of a 3" pipe. The really funny part is that she is listening thru a stethoscope that seems to be coming out of the handle. Potential scam? Never have seen one like this. Could be a home made prototype.

[Seeker]

This is not coin locator, one coin is too small to be find with this unit.

[Unregistered]

gpr-project

Funky aparatus in the picture is most likley a gradiometer.A diferential proton precesion magnetometer.The black cilinders on the ends are the coils,since it has a big span betwen them,plus the waterproof housing and the girl is wearing a bikiney its for shipwrec hunting.

[Morgan]

Not magnetometer

Funky aparatus in the picture is most likley a gradiometer.A diferential proton precesion magnetometer.The black cilinders on the ends are the coils,since it has a big span betwen them,plus the waterproof housing and the girl is wearing a bikiney its for shipwrec hunting.

Hello
This photo is from old book "Buried & Sunken Treasure"1974.
This girl was hunting for coins along the tide line...And coins are not in iron.
Unfortunly i can see nobody have shematic of this device.Its a powerful two box for coin hunting,i think...

Regards

[Unregistered]

GPR-project

For a GPR it coud be usefull 2,4 Ghz video transmiter,in puls transmiting,and for a reciver a simple shotky diode+shf fet low noise,for a signal mesurment (distance from a target) a modifed circuit of a laser distance meter.

[Gem Searcher]

Seeker - Detection of covalent bonds

Would it be possible to use a vapor deposit detector chip, something similar to a ccd chip, that would detect the natural emanation of energy from covalent bonds between similar atoms? Looking more towards the detection of energy emitted by such bonds in a crystalline structure such as diamond. Would one have to supply an excitation force to do this?

[yeraltici]

Bunların alayı uyduruk şeyler, neyin görüntüsünü veriyorlar? Toprak altının sadece grafiği çıkartılabilir. sonuçta o işte bir analiz cihazı ile mümkün olabilir. Nasılmı. Gönderilen ses dalgalarının ve titreşimlerin yansıyarak geri dönen enerjisiyle çıkarılan sonuç, yer altı grafiğidir. Yer altı görüntü cihazı uyduruk bir arayış.

[Seeker]

Would it be possible to use a vapor deposit detector chip, something similar to a ccd chip, that would detect the natural emanation of energy from covalent bonds between similar atoms? Looking more towards the detection of energy emitted by such bonds in a crystalline structure such as diamond. Would one have to supply an excitation force to do this?

Hi,
What do you mean by "natural emanation of energy" ? CCD chip consist ~380000 photoelements. Nipkov's disc can reduce numbers of photoelements to only 1 , but it needs mechanical system.
Some crystalline structures has piezoeffect, nonlinear VA characteristic or something else.