I've conducted a measurement of underwater noise in a laboratory experiment. Therefore i am using a sweep signal.
Sometimes -I guess when the signal is much more louder- I get this fascinating repeating and kind of symmetric pattern when I analyse the signal. Can someone name the physical phenomena involved which are causing this?
The picture below shows the response without Pattern:
Response with repeating Pattern:
The only difference I can find is that the recorded response is much louder. I am still clueless and fascinated which physical phenomena might be the cause of the