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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • 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)
http://dx.doi.org/10.1364/OL.28.001323


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Abstract

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

Citation
Andreas Kempe, Stefan Schlamp, Thomas Rösgen, and Ken Haffner, "Low-coherence interferometric tip-clearance probe," Opt. Lett. 28, 1323-1325 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-15-1323

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