I'm very new to signal processing and have been struggling this far. I have a device that measures the signal due to the magnetization of iron particles. In order to calculate the response of the particles, I did 2 measurements:
- Background measurement, so without particles, so the signal should be 0, but as the figure shows, it is not.
- Measurement with particles.
The problem is that even at the background measurement I get a sort of signal, because of many complex reasons like field through, in the device, there is iron because of the production process and so on... It is true that the magnitude of the signal of the base measurement is 2 orders lower than the one with the particles but the shape of the signal and the peaks are already to be seen at the base measurement. So one should say, that the signal I got while having the particles in the device, does not only come from the particles.
- Question: now my question is how to extract the signal that only comes from the particles? A simple subtraction is not the answer, as the magnitude is not alike. Filtering in the frequency domain did not help as the particles are simulated with a frequency f0 and in the signal, we just collect the harmonics. Can please anyone help?
- take out the peaks at 44 and 65 because they are certainly not from the particles, as one can definitely see them in the base measurement without the particles.