There will be a log on the ships command and control system of the activity around the incident but having sensors primed and recording for such a pulse is highly unlikely.
There may be an easily explainable reason why two crew members suffered injuries that appeared to be from a Chinese ships sonar pulses but no explanation seems to have been suggested.
As for evidence China did emit sonar pulses I don't think we will get to see the log on the Chinese ship which would be the best place to start. Unfortunately this will be played out in the courtrooms of public opinion and one side looks like it will loose. Not a thing to be celebrated.