implementing an envelope to a measured oscillated signal

Hello,

I need to implement an envelope on oscillating scans I'm doing but I run into difficulties doing it. (the purpose is to calculate the FWHM of the signal) Tried using the envelope function but it just provides me values with oscillations. Attaching file example of the scans. Would appreciate the help.

[Adam]

If your signal has oscillations that the envelope will also reflect this, though to a lesser extent as it will be either all positive for the split parts of the envelope. I've always calculated envelope myself from the hilbert transform, but the envelope function seems like it does the same job fine.

[elis02]

can you please give me an example code i can use? I tried it but maybe used it wrong since the envelope also gives me very high contrast oscillations. so I assume I'm doing something wrong.