Filtering background noise

I am looking for a way to filter background noise from laser vibrometry traces. I can see a background sinusoidal wave on which the vibration data rests, but I’d like to know how to flatten that background wave into a straight line. Or, at least, correct for that wave. This way, I would measuring true amplitudes within my vibration data. Thanks!

A high-pass filter at twice the sine wave frequency …

high-pass filter

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