The first signs of change in the operating condition of an asset are usually indicated in the ultrasound frequencies.
Only after the asset has progressed to a more severe stage of deterioration do other asset condition monitoring technologies begin to play a role.
For planners and schedulers, having the largest window of opportunity possible to order parts, plan downtime, and allocate labour represents a tremendous advantage.
Besides Infrasound and Audible sound, Ultrasound refers to any sound pressure wave with a repetition frequency greater than 20 kHz. The characteristics of ultrasound, especially around 40 kHz are particularly interesting for inspectors listening for symptoms of assets failure.