response
The phase and gain response of the device versus position. I had to excite this at 100kHz to keep the current draw down - this is way higher than commercial ones (few kHz).
"Output gain" means the output amplitude as a % of the input amplitude.
Reasonable linearity, although not symmetrical. Hardly surprising, since I didn't keep count of the turns and didn't take care to wind them uniformly!
Note that the null voltage is not zero - this will never really be the case because of the effects of leakage inductance and winding capacitance. However, on the linear slope, it's a pretty good indicator of position.
For a first attempt, I'm pretty happy with this. Next I'll maybe make another coil with many more turns, and use a lower excitation frequency.
response
The phase and gain response of the device versus position. I had to excite this at 100kHz to keep the current draw down - this is way higher than commercial ones (few kHz).
"Output gain" means the output amplitude as a % of the input amplitude.
Reasonable linearity, although not symmetrical. Hardly surprising, since I didn't keep count of the turns and didn't take care to wind them uniformly!
Note that the null voltage is not zero - this will never really be the case because of the effects of leakage inductance and winding capacitance. However, on the linear slope, it's a pretty good indicator of position.
For a first attempt, I'm pretty happy with this. Next I'll maybe make another coil with many more turns, and use a lower excitation frequency.