FGM 3 sensor

[Krzysztof]

Hi Teknoloji.
Typical carcass with a 3 mm, length 25 mm lens, 2000 turns.
Best regards Chris.

[teknoloji]

Have pictures of different coil.? winding shape is not obvious.

Regards

[Krzysztof]

Hi Orbit!
So.
U me above 100kHz frequency was already low compared with changes in the frequency of 40kHz. Assuming the same object changes.
Together with the increase in the frequency decreases preambility (u), nearly linear relationship.
This means a reduction of sensitivity!
Best regards Chris.

[Orbit]

Whether they increase or decrease in frequency from the from the vitrovac ,FGM sensor 3 can achieve better sensitivity?

[Orbit]

I thought the difference between the original fgm3 -and reconstructed !!!

[Orbit]

With the new coil ,


and the second inductancethe and on the same material I rolled up -I got three times better sensitivity !!!

[Orbit]

L1 and L2 inductance 763mh!

Happy new year !!!!

[Orbit]

fgm3 original sensor resin removed - and vitrovac !!

[Krzysztof]

Hi Geo!
Coil 1000 turns around, 5mH, frequency 35-110kHz. The core of metglas bar.
Not the same FGM3, I took various oscilators.
The frequency varies, depending on the type of oscillator and a core. Heavily dependent on the type of material, size, volume, core temperature. Very much depends on the position in space.
A lot of patience and you can do this!
Best regards Chris

[Geo]

Hello Geo & Orbit,

The experiment with the ferrite coils I made last week, the tests with the vitrovac I made some 4-5 years ago ( how time flies..) If I remember well I used some 0.10 and 0.14 mm isolated copperwire, 2 coilwindings ,some 150 - 200 windings, bifilar wound Never made inductance measurements.. so do not now. Look at the schematic for the start/finish from the coils. The coils I wound on a papertube that I had fixed with some waterbased glue on a metal strip, after winding easy to remove.. look at the photo's. The vitrovac strip can then placed in the paper tube.
The most difficult was to make 2 the same..
If you look at Internet ...sears for the Armstrong oscillator, as Ivica told me this is the oscillator used ..

Best regards.

Ap

Thanks Ap

Regards

[Orbit]

http://www.youtube.com/watch?v=dP84i...eature=related _ oscillator with 555 !

[Orbit]

1l. paint can at some 3 meters..! I mean .. It's just fine? percent and I think I fgm3 ,but the paint box of 1l I have the impression that the better! Maybe I mistaken? thank you for quite precise answers. Greeting !

[ApBerg]

Hello Geo & Orbit,

The experiment with the ferrite coils I made last week, the tests with the vitrovac I made some 4-5 years ago ( how time flies..) If I remember well I used some 0.10 and 0.14 mm isolated copperwire, 2 coilwindings ,some 150 - 200 windings, bifilar wound Never made inductance measurements.. so do not now. Look at the schematic for the start/finish from the coils. The coils I wound on a papertube that I had fixed with some waterbased glue on a metal strip, after winding easy to remove.. look at the photo's. The vitrovac strip can then placed in the paper tube.
The most difficult was to make 2 the same..
If you look at Internet ...sears for the Armstrong oscillator, as Ivica told me this is the oscillator used ..

Best regards.

Ap

[Geo]

Hello GEo,


Ha... just last week I made a test with ferrite rods... it does not work ! Used 20 cm feritte rods, this gave a very very low sensetive
What works.. the metal you can find in transformators, is some Mu metal (not so good).
Best is some vitrovac metal. You can find this metal in protection strips used in shops and books. I have found some good Vitrovac Mu metal in a toroid .It is not so easy to recover it from the toroid, the metal is very hard so it breaks fast. After heating it (red glow) it is better to handle. http://www.vacuumschmelze.com/index.php?id=292
I made a 15 cm coil that gave a good freq. change when moving a 1l. paint can at some 3 meters..! But the problem is that the coil is also very North South sensitive...

I made this FGM copy's just to see how it works.. If you want to make a magnetometer ..think it is easyer and cheaper to bay them from Speake and Co. http://www.speakesensors.com/

Best regards.

Ap

Btw... who is the inductance of every coil???

Regards

[Geo]

Hello GEo,


Ha... just last week I made a test with ferrite rods... it does not work ! Used 20 cm feritte rods, this gave a very very low sensetive
What works.. the metal you can find in transformators, is some Mu metal (not so good).
Best is some vitrovac metal. You can find this metal in protection strips used in shops and books. I have found some good Vitrovac Mu metal in a toroid .It is not so easy to recover it from the toroid, the metal is very hard so it breaks fast. After heating it (red glow) it is better to handle. http://www.vacuumschmelze.com/index.php?id=292
I made a 15 cm coil that gave a good freq. change when moving a 1l. paint can at some 3 meters..! But the problem is that the coil is also very North South sensitive...

I made this FGM copy's just to see how it works.. If you want to make a magnetometer ..think it is easyer and cheaper to bay them from Speake and Co. http://www.speakesensors.com/

Best regards.

Ap

Hi Ap.
Thanks for info.
I have 2 magnetometers and some sensors, but i ask only from technological interesting....

Regards