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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 9 — May. 1, 2006
  • pp: 1217–1219

Fiber-optic laser Doppler turbine tip clearance probe

Lars Büttner, Thorsten Pfister, and Jürgen Czarske  »View Author Affiliations

Optics Letters, Vol. 31, Issue 9, pp. 1217-1219 (2006)

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A laser Doppler based method for in situ single blade tip clearance measurements of turbomachines with high precision is presented for what we believe is the first time. The sensor is based on two superposed fanlike interference fringe systems generated by two laser wavelengths from a fiber-coupled, passive, and therefore compact measurement head employing diffractive optics. Tip clearance measurements at a transonic centrifugal compressor performed during operation at 50,000 rpm ( 833 Hz , 586 m s tip speed) are reported. At these speeds the measured uncertainty of the tip position was less than 20 μ m , a factor of 2 more accurate than that of capacitive probes. The sensor offers great potential for in situ and online high-precision tip clearance measurements of metallic and nonmetallic turbine blades.

© 2006 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(150.3040) Machine vision : Industrial inspection
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: December 14, 2005
Revised Manuscript: January 23, 2006
Manuscript Accepted: January 24, 2006

Lars Büttner, Thorsten Pfister, and Jürgen Czarske, "Fiber-optic laser Doppler turbine tip clearance probe," Opt. Lett. 31, 1217-1219 (2006)

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