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Related Experiment Videos

Low-coherence interferometric tip-clearance probe.

Andreas Kempe1, Stefan Schlamp, Thomas Rösgen

  • 1ETH Zürich, Institute of Fluid Dynamics, Sonneggstrasse 3, Zurich 8092, Switzerland. kempe@ifd.mavt.ethz.ch

Optics Letters
|August 9, 2003
PubMed
Summary
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We developed a cost-effective, all-fiber probe for precise gas turbine blade tip-clearance measurements. This technology enables near-real-time, single-port monitoring with submillimeter accuracy, enhancing operational efficiency.

Area of Science:

  • Mechanical Engineering
  • Optical Metrology
  • Aerospace Engineering

Background:

  • Gas turbine performance relies on maintaining optimal blade tip clearance.
  • Accurate, real-time monitoring of blade tip clearance is crucial for efficiency and safety.
  • Existing methods for tip-clearance measurement can be complex or lack precision.

Purpose of the Study:

  • To introduce a novel, economical, all-fiber probe for gas turbine blade tip-clearance measurement.
  • To achieve near-real-time, single-port, simultaneous blade-to-blade measurements.
  • To attain submillimeter accuracy in tip-clearance determination.

Main Methods:

  • Utilizing low-coherence interferometry with a frequency-shifted reference beam.
  • Employing a single optical fiber for probe connection, allowing flexible installation.

Related Experiment Videos

  • Leveraging the interference pattern of backreflected light from blade tips during passage.

    • Main Results:

    • Demonstrated submillimeter accuracy (typically < 100 microm, absolute) in measurements.
    • Achieved near-real-time data acquisition during blade passage events (1 micros).
    • Validated the probe's capability for simultaneous, single-port, blade-to-blade measurements.

    Conclusions:

    • The proposed all-fiber probe offers a self-calibrating and economical solution for critical gas turbine monitoring.
    • This technology enables precise, real-time assessment of blade tip clearance in the initial stages of turbines.
    • The system's design facilitates straightforward integration and reliable performance in demanding environments.