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Optics Letters

Optics Letters


  • Vol. 28, Iss. 15 — Aug. 1, 2003
  • pp: 1323–1325

Low-coherence interferometric tip-clearance probe

Andreas Kempe, Stefan Schlamp, Thomas Rösgen, and Ken Haffner  »View Author Affiliations

Optics Letters, Vol. 28, Issue 15, pp. 1323-1325 (2003)

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We propose an all-fiber, self-calibrating, economical probe that is capable of near-real-time, single-port, simultaneous blade-to-blade tip-clearance measurements with submillimeter accuracy (typically <100 μm , absolute) in the first stages of a gas turbine. Our probe relies on the interference between backreflected light from the blade tips during the 1-μs blade passage time and a frequency-shifted reference with variable time delay, making use of a low-coherence light source. A single optical fiber of arbitrary length connects the self-contained optics and electronics to the turbine.

© 2003 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(040.2840) Detectors : Heterodyne
(060.2310) Fiber optics and optical communications : Fiber optics
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(280.3400) Remote sensing and sensors : Laser range finder
(290.1350) Scattering : Backscattering

Andreas Kempe, Stefan Schlamp, Thomas Rösgen, and Ken Haffner, "Low-coherence interferometric tip-clearance probe," Opt. Lett. 28, 1323-1325 (2003)

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  1. C. Sieverding, Tip-Clearance Effects in Axial Turbomachines, Lecture series 1985–5 (Von Karman Institute, Rhode-St-Genese, Belgium, 1989).
  2. A. Steiner, Meas. Sci. Technol. 11, 865 (2000).
  3. A. G. Sheard, S. G. O'Donnell, and F. F. Stringfellow, J. Eng. Gas Turbines Power 121, 167 (1999).
  4. H. S. Dhadwal and A. P. Kurkov, J. Turbomach. 121, 481 (1999).
  5. J. P. Barranger and M. J. Ford, J. Eng. Power 103, 457 (1981).

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