I'm not sure. I wanted general materials properties/design information for my experiments.
I wanted more of a lay of the land of inductor stability rather then a specific design. Kind of like the information found in keithleys low measurement handbook. There does not appear to be much information about inductors... for instance this forum is crazed about stable resistors and there is quite a bit of information available about capacitors already..
there just seems to be some hatred of the inductor passive in the precision community, everyone would rather avoid its use with creative ways then explore it because it seems to be the most nonlinear, unstable and generally unwieldy device in electronics.. just look at how much effort was put into gyrators and switched capacitor filters. It seems to be relegated to either coarse measurements which leave people satisfied with some small amount of dB drift (which is large in ppm) for radio purposes, where signal strength does not matter so much, so long the information is conveyed, or for power electronics purposes, or for HF rejection/EMI applications where its basically used to give someone confidence in passing a standard or to keep something kinda working in case there is a problem to prevent catastrophic operation modes.
I would like to make a playbook that gives you options in using the inductor in passive filters for measurements that voltnuts would find interesting. If you read the literature about resistor stability, you get a good idea of what the 'theoretical limits' for stability are for resistive dividers, etc. But nothing of the sort really exists for inductors. I thought that there might be some areas where they are the superior choice, i.e. in circuit LCR measurement at high frequencies with other high level signals present for active impedance analysis, so that a device does not get swamped by dynamic range violations in an ADC or clipping a fast active filter. Not to mention they provide very robust protection for band limited AC measurements.
The idea for using low TCR wire to wind the inductors is a good idea, they would limit the dimensional changes and stresses imposed by the wire, however it is lossy right?
I am interested in mu core materials because of the large size of air coiled inductors, I would like to focus on at least somewhat methods practical for regular circuit use. It would be hard to justify using something the size of a shoe box to make a front end for a LCR meter or something, in most cases...
I guess its mostly because in the region where inductors are wanted, dB measurement starts being used, which is typically far coarser. No one measures 0.001dB.
Also, the use of passive filters would remove intermodulation distortion products in the semiconductor ADC, preamp, active filters, though I am not sure how measurable they are at lower frequencies.