| 摘要 |
A gas turbine engine includes an arrangement for measuring shaft rotation speed, including a laser source (10) for directing a laser beam (11) onto portions of rotor blades to either be reflected from or interrupted by the rotor blades to create light impulses as a function of the rotor rotation rate. A receiver diode (12) receives the light impulses and generates voltage impulses corresponding to the rotor or shaft rotation rate. An evaluation unit associated with the receiver diode measures the number of the voltage impulses generated per unit of time and calculates therefrom the rotation speed of the engine shaft connected to the rotor. The measurement arrangement is arranged in the engine housing to be easily accessible for mounting, maintenance and adjustment, is functionally reliable under robust engine operation and can detect the rotation of a low pressure shaft and connected fan.
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