Title :
High-Speed, capacitance-based tip clearance sensing
Author :
Haase, W.C. ; Haase, Z.S.
Author_Institution :
Aerogage Corp., Sterling, MA, USA
Abstract :
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.
Keywords :
blades; calibration; capacitance measurement; capacitive sensors; digital signal processing chips; engines; probes; pulse measurement; signal processing; time measurement; turbines; bandwidth 5 MHz; blade pulse measurement; blade-to-blade time interval; calibration technique; capacitive probe; gain 3 dB; high-speed capacitance-based tip clearance sensor; subsequent mixed-signal processing circuitry; tip clearance measurement system; turbine engine; wideband signal processing; Blades; Cable insulation; Probes; Pulse measurements; Rotation measurement; Thickness measurement; Vibration measurement; blade-by-blade tip clearance; capacitance; vibration measurement;
Conference_Titel :
Aerospace Conference, 2013 IEEE
Conference_Location :
Big Sky, MT
Print_ISBN :
978-1-4673-1812-9
DOI :
10.1109/AERO.2013.6496903
