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Multi-Parameter Measurement of Rotors Using the Doppler Effect of Frequency-Swept Interferometry
Bin Shao1, Wei Zhang1,2, Peng Zhang1
1Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China.
Sensors (Basel, Switzerland)
|December 18, 2020
Summary
Frequency-swept interferometry (FSI) can now measure rotor parameters. This method uses the rotational Doppler effect to determine angular velocity, axial clearance, and tilt angle with high accuracy.
Area of Science:
- Optics and Photonics
- Mechanical Engineering
- Rotational Dynamics
Background:
- Frequency-swept interferometry (FSI) traditionally faces challenges with dynamic ranging accuracy due to the Doppler effect.
- The rotational Doppler effect's potential for multi-parameter measurement in rotors has been largely unexplored.
Purpose of the Study:
- To propose a novel FSI-based method for multi-parameter measurement of rotors.
- To leverage the rotational Doppler effect for enhanced rotor diagnostics.
Main Methods:
- Developed a rotational Doppler formula specific to FSI.
- Utilized frequency, direct component, and amplitude of dynamic distance for parameter estimation.
- Constructed a rotor platform and a fiber-optic FSI system for experimental validation.
Main Results:
- Successfully estimated rotor angular velocity, axial clearance, and tilt angle.
- Achieved relative errors below 3.5% for all measured parameters.
- Demonstrated the feasibility of in-situ, multi-parameter measurement within confined spaces.
Conclusions:
- The proposed FSI method effectively overcomes traditional Doppler effect limitations.
- This technique enables direct, simultaneous measurement of multiple rotor parameters using a single probe.
- Offers a new perspective for diagnostics in space-confined rotating machinery.
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