This paper discusses recent advances in tip clearance measurement systems for turbine engines using capacitive probes. Real time measurements of individual blade pulses are generated using wideband signal processing providing 3 dB bandwidths of typically 5 MHz. Subsequent mixed-signal processing circuitry provide real-time measurements of maximum, minimum, and average clearance with latencies of one blade-to-blade time interval. Both guarded and unguarded probe configurations are possible with the system. Calibration techniques provide high accuracy measurements.
High-Speed, capacitance-based tip clearance sensing
2013-03-01
2500288 byte
Conference paper
Electronic Resource
English
Capacitance Type Clearance Probes for Turbomachinery
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