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In order to improve the safety, the lifetime and the energy efficiency of turbo machines, the dynamic behaviour of the rotor has to be analysed and optimized. Thus, rotor unbalances, dynamic deformations and blade vibrations as well as blade tip clearance changes have to be monitored during operation to optimize the rotor design and to validate numerical models. However, these are big challenges for metrology, since small, robust and non-contact measurement techniques are required offering both micron accuracy and microsecond temporal resolution. We will give a thorough description of a robust, non-incremental fiber-optic distance sensor, which is only 20 mm in diameter and less than 100 mm in length. Simulative results of its numerical optimization using the software tool ZEMAX are presented. In addition, simulated data is compared with laboratory measurements to confirm the reliability of the simulation.

2.2 - Robust and Miniaturized Non-Incremental Fiber-Optic Distance Sensor for Turbo Machine Rotor Deformation and Vibration Monitoring