This circuit uses an Eddy Probe, to represent it I use the symbol of the inductance with 2 lines in front ():
- We need a carrier amplifier, a synchronous demodulator, and a logarithmic amplifier.
- In this case, there is another probe (), which is not exposed to the target, it’s not facing the target, and it’s in an enclosed situation.
It is used only to compensate the temperature effect on the actual sensor, since the coil and also the resistance are sensitive to temperature.
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