Quote:
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Originally Posted by tdowns
Quote:
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Originally Posted by fullerplast
Inductance doesn't change due to the bridge material;
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That is not what data shows. Inductance DOES change with bridge material, its just not enough to matter. |
For a coil with no core, the magnetic field will have no effect. With a core, as we both mentioned earlier, the field will have an effect. Pickup polepieces are kind of a special case, it's not really a core and it's not really free space either. In addition to all this, you have some capacitive components between the insulated wire. Just looking at your data, you can see that there's more going on. Your voltage is not increasing in a linear fashion with frequency, as it would with pure inductance (X=2*pi*f*L). It's rising to a peak and then actually decreasing with frequency.
Accurately modeling the pickup inductance, capacitance, and pure resistive components, taking into account the pseudo-core properties of the polepieces in the presence of a magnetic field would make somebody a very interesting project! As you seem to have verified, the pickup seems to be acting
closer to a coil in free space than a coil with a core. I agree with you that any change in inductance due to the effect of the polepieces as a core is essentially negligible.