Bently Nevada Vibration Probe

I am reading one of the article regarding bently Nevada vibration probe and I have doubt regarding proximitor output.

Suppose my probe is situated in front of rotating shaft in normal operation then it will give DC voltage or AC voltage?

If probe is sense vibration in shaft then what is change in output signal? In that case output will be AC or DC voltage and if it is AC voltage then what is frequency of that output signal?

So kindly clear my doubts. Thank You.



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DC voltage with a gap voltage of -7 or -10 depending on the application. vibration will be sensed and the DC Volts will change accordingly.