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A new fiber-optic sensing method enables strain measurement in fast-rotating structures without central optical access. This technique successfully measured rotation-induced strain up to 5000 rpm, showing high accuracy.

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Area of Science:

  • Engineering
  • Optics
  • Materials Science

Background:

  • Fiber-optic sensing offers advantages for structural monitoring.
  • Sensing in rotating structures presents unique challenges, particularly regarding optical signal transmission.
  • Existing methods often require complex optical setups or are limited by rotation speed.

Purpose of the Study:

  • To present a novel, generic fiber-optic sensing approach for rapidly rotating structures.
  • To demonstrate strain measurement without needing optical ingress through the central rotation axis.
  • To validate the method's performance at high rotation speeds.

Main Methods:

  • Development of a generic fiber-optic sensing system adaptable to rotating components.
  • Implementation of strain measurement techniques on a rotating test structure.
  • Experimental validation across a range of rotation speeds (500-5000 rpm).

Main Results:

  • Successful strain sensing in a rotating body at speeds up to 5000 revolutions per minute (rpm).
  • Demonstrated measurement of rotation-induced strain at 500 rpm intervals.
  • Experimental results showed excellent agreement with theoretical predictions.

Conclusions:

  • The presented fiber-optic sensing approach is effective for monitoring strain in rotating structures.
  • The method's independence from central optical access simplifies implementation.
  • The technique shows potential for even higher rotation speeds and broader applications.