Proton Mag signal level?

[Boattow]

I'm curious, what kind of signal level is typical from a proton mag sensor? Then after it is tuned to resonance with capacitors, what is a typical signal level? How can it be calculated what the signal level will be by resonating the sensor?
Thanks,
Boattow

[ToyMaker]

this paper has all the math to answer your questions:

www.ip-sl.org/procs/2008/ipsl0812.pdf

The author says that their raw sensor output is ~0.5uV.





robotic regards,

Tom

[Boattow]

Thanks, but...

I still don't see it. If the sensor outputs a signal of .5uV, I get that he has math which is giving this signal level. I also see math for calculating the capacitor needed to resonate the sensor for the expected frequency of use. However, I don't see anything and can't find anything that says with this sensor signal level, with this resonance capacitor value, here is what the increased signal level from resonance should be. If it's there, I don't see it.
Thanks,
Boattow

[msolc]

You have to be far from any metal, ac power line, houses etc...go to the medow far from town and use battery powered instruments at least 3-4 m away from sensor...use two coils sensor to cancel out interferences...it took me over 1 month before I obtained first signall.

[Willy Bayot]

I'm curious, what kind of signal level is typical from a proton mag sensor? Then after it is tuned to resonance with capacitors, what is a typical signal level? How can it be calculated what the signal level will be by resonating the sensor?
Thanks,
Boattow

Hi,
The start amplitude of the decaying sine wave generated by the proton precession depends on the size of the sensor coil(s) whether tuned or not.
It also depends on the proton-rich fluid and the orientation of the sensor (if solenoid) and is maximal if the main axis of the coils is at 90° from the global earth field vector at the current location.
On our PPM-MarkII instrument, we are using tuned noise-cancelling solenoid coils which give us a raw signal with a start amplitude of at least 1µV.
The tuning of the sensor gives a good free of charge gain and we know by experience that it is not too sensitive (i.e. the Q of the sensor is rather low). We have designed a 6-caps tuning system controlled with a 6-position DIP switch in order to cope with setting for any worldwide location.
Willy

[Boattow]

Thanks

Thanks for the answer but no one has been able to answer the question. If you start with 1uV, then add the correct capacitance (found by a formula) to get resonance, how do you know how much signal level is gained by this? Is there a formula? I have searched extensively and cannot find one.
So if I take a coil connected to the electronics without resonance, induce a signal from another coil, and measure the output, then resonate it, and again measure the output, is this the gain that can be expected across the frequency spectrum caused by resonance? Seems like there should be a way to predict, with a known signal level from the sensor, what the output will be with resonance added. In Jim Koehler's paper he states he is a physicist and wants to know every little detail and shows all kinds of incredible math, but he glossed right over this. I've seen what you are doing in your mag, but do you actually know what you are gaining by resonating the sensor...could you have predicted it?
Good luck,
Boattow

[Willy Bayot]

Thanks for the answer but no one has been able to answer the question. If you start with 1uV, then add the correct capacitance (found by a formula) to get resonance, how do you know how much signal level is gained by this? Is there a formula? I have searched extensively and cannot find one.
So if I take a coil connected to the electronics without resonance, induce a signal from another coil, and measure the output, then resonate it, and again measure the output, is this the gain that can be expected across the frequency spectrum caused by resonance? Seems like there should be a way to predict, with a known signal level from the sensor, what the output will be with resonance added. In Jim Koehler's paper he states he is a physicist and wants to know every little detail and shows all kinds of incredible math, but he glossed right over this. I've seen what you are doing in your mag, but do you actually know what you are gaining by resonating the sensor...could you have predicted it?
Good luck,
Boattow

Hi,

This is the calculator my PPM project partner Jim Koehler has designed to evaluate the results to be expected from a solenoid sensor of given specs:
http://perso.infonie.be/j.g.delannoy...moptimizer.xls
The signal in µV given in column L is the expected peak-to-peak voltage generated from an untuned sensor. In order to get the voltage from a tuned sensor, multiply this by Q (column I).
All the math is embedded in the Excel sheets and you can easily extract it from there.

Willy

[Boattow]

Thanks again

Awesome, I'll give it a look, thanks again.