High-Speed, capacitance-based tip clearance sensing

Author

Haase, W.C. ; Haase, Z.S.

Author_Institution

Aerogage Corp., Sterling, MA, USA

fYear

2013

fDate

2-9 March 2013

Firstpage

1

Lastpage

8

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Aerospace Conference, 2013 IEEE

Conference_Location

Big Sky, MT

ISSN

1095-323X

Print_ISBN

978-1-4673-1812-9

Type

conf

DOI

10.1109/AERO.2013.6496903

Filename

6496903