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For truly non-contacting methods of operating sensors on board a piece of rotating machinery, such as a turbine, several specialised forms of wireless telemetry have been developed.

These special systems are usually required to deliver electrical power across the telemetry gap, for the purposes of operating the various sensors that may present, typically torque and/or thrust (both employing strain gauge bridges), acceleration and temperature.

The power transfer requirements can be met by using a separate LF coil and pickup arrangement, with a separate HF transceiver, or can be met by using a HF coupling that also proviides a two-way communications channel of useful bandwidth.