Overhauser Magnetometer?

[Boattow]

Hello all,
I have built a pretty nice proton precession mag. I would really like to build an overhauser mag. I've been collecting and reading all the info I can find on the subject. As near as I can tell, I can use my proton mag as the basic platform for an overhauser mag. It would seem that the difference primarily will be the sensors. I'm thinking you could find something suitable for a 60mhz RF transmitter off the shelf. A coil of wire would still be used for signal pickup of the proton signal. I can't find any details on what the load would be for the transmitter. I've read 4 to 5 watts of RF power would be required. I'm guessing some sort of an antenna in the sensor and a transmitter in the main box with coax connecting the signal source to the sensor's antenna. And of course the final question is what is the fluid. I'm guessing there isn't anything off the shelf for this. If so, how to make it? It all sounds quite possible, but there isn't much detail I can find to do this without a lot of trial and error. I'd rather find a successful implementation to gain knowledge. Jim's and Willy's papers were a big help in cutting the time on developing the proton mag but nothing like that seems to exist for an overhauser implementation.

Anyone have more info?
Thanks,
Boattow

[Boattow]

Well, it's been a couple of weeks now without a single reply. I didn't realize how dead this forum is. I've continued to read and re-read everything I can find on the subject. I've ordered an RF signal generator and a 5 watt RF amplifier. I've found a couple of sources for the free radical. I'm still very uncertain about an antenna for the RF transmitter, what solvent to use, and what the ratio of free radical to solvent will be. Once I have a suitable antenna and a sensor housing machined (the ones I have for my proton mag isn't going to work), then I'll start experimenting. I have started mapping out an approach to the experiments based on the material I've found. Everything is scholarly and theoretical, nothing practical. It makes this more difficult than it otherwise would be. As near as I can tell, Gem Systems is the only company making a commercial system.
See ya,
Boattow

[Davor]

Well, I gave it a thought some time ago, but when you seek free radicals that you need to make it tick, you realise that there are none to be found on free market. Tempone is the common kind, but I couldn't find a way to obtain any at that time. So it was a flop.
Perhaps this magnetometer would be more widespread if you could only obtain materials as an amateur.
Therefore you'll find proton precession solutions as water is still easily obtained.

[Boattow]

Wonder why the material's would be hard to find on the free market? Did you not find a source for it or did you find a source and they wouldn't sell it to you? Did you actually try to order it?

[Davor]

This tempone substance is something you don't get in a shop. Where I live you have to import it, and chemical stuff... you are immediately on top of a terrorist list. There is a company that sells it, at https://www.caymanchem.com and you may try your luck with them. The nearest place to buy the stuff for me is Estonia, and minimum quantity is 1g, which should be enough, but I never went through trouble to ask about price, as it is not announced.
Given the complication behind it I simply gave up. When obtaining the single critical substance is a complication, I think it was a good call.