Metal Densities And Conductivity

[Geotech]

OK, I have a Nox 800 so I'll do some testing. Musical instruments rely on mechanical vibrations, completely different scenario.

[IBMe]

36 minutes ago, Geotech said:

OK, I have a Nox 800 so I'll do some testing. Musical instruments rely on mechanical vibrations, completely different scenario.

“mechanical vibrations” as in wave? What effect does mass have on the wave. Is there a “mass wavelength and velocity formula?”

 

Easy test. Put two aluminum caps on top of each other. Take swing and note sound width. Put gold ring inside caps. Note tonal difference and sound width difference. The tone changed and got real tight due to the mass.

[IBMe]

If we change the terminology and call this “bump” instead of density. I've heard some use that term. You swing and you hear a tight bump in the sound, you zero in on that bump. That’s all we’re talking about here. A tight bump in the audio.

[kac]

New chart using iacs conductivity. Wonder why there are so many using log7 and log5? Thats a load of crap aint it? So fall off has to do more with density of target and has little to do with phase angle relation to it.

Thanks!

For those that are curious just take your machine and wiggle off a target if you have a dd coil and you should hear and see how they fade.

[IBMe]

There is some information in the tone. There are mass wavelength and velocity formulas. What can be done with that? I don’t know.

Let’s pretend you can pull it out of the signal.

That puts gold on top of the scale. Then lead and then silver. Puts aluminum at the bottom of the scale.

How sweet would that be? Might dig a little junk lead instead of a mountain of aluminum. And it has value. Don’t have to dig zinc.

Forget the conductivity scale, give me a density scale.

[goldenoldie]

On 11/5/2024 at 5:01 AM, Geotech said:

 

 Here's an experiment: obtain a bunch of targets that are all round discs but of different metals: gold, silver, copper, nickel, aluminum, brass, lead, zinc, & tin.  Preferably all similar sizes. 

 

Several years ago, I made up round discs of different metals with similar diameters and thickness to a US Nickel coin. I also included a 9ct Gold ring of similar diameter. I then performed some air tests using a PI detector and two coils a 11DD and 18DD.

 

Also, below this chart on Conductivity may be of some interest.