Compressor/turbine gap, revolutions

When parts are rotating, their speed can always be measured. Speed sensors which are directly attached to the shaft are usually suitable for this. If this is not possible, other measuring principles must be used where, e.g. the rotating part is measured on the front side. In order to reliably measure the speed in this arrangement, defined points per revolution must be measured. Eddy current sensors, capacitive and laser sensors are used for this.