High-accuracy measurement system for rotor-stator axial clearance in narrow spaces based on all-fiber microwave photonic mixing

Yu, Zhenxin; Liu, Wenzheng; Duan, Fajie; Fu, Xiao; Bao, Ruijia; Guo, Guangsheng

doi:10.1364/oe.492391

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…The measurement environment inside the engine is full of high temperature airflow and the space is narrow. These factors all lead to difficulties in axial clearance measurement [1][2][3]. Distance measurement based on frequency scanning interferometry (FSI) is an optical measurement method that uses the frequency of interference signal to calculate the distance, which has the advantage of high precision.…”

Section: Introductionmentioning

confidence: 99%

An axial clearance measurement method based on time-frequency analysis for high speed target in narrow space

Zhang,

Ren,

Shao

et al. 2024

Preprint

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Frequency-Scanning interferometry (FSI) is often used for high-precision and large-scale static distance measurement. When FSI is applied to the measurement of high-speed moving targets in narrow space, the initial distance cannot be set large. The Doppler effect caused by target motion is serious. So, the interference signal will appear negative frequency component. Current frequency identification methods can only recognize positive frequencies, so the phase extraction can only extract monotonically increasing phase changes. This will result in the clearance demodulation error. A clearance measurement method based on FSI for high speed target in narrow space is proposed in this paper. By extracting the time-frequency information, utilizing the bidirectional threshold to determine the zero value of frequency, a sign judgement function is constructed to achieve the frequency and phase correction. The above procedure can avoid demodulation error in the initial clearance demodulation value. The experimental results show that the modified initial clearance demodulation error decreases from 36.5% to 0.4% at 12000 rpm.

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Section: Introductionmentioning

confidence: 99%

An axial clearance measurement method based on time-frequency analysis for high speed target in narrow space

Zhang,

Ren,

Shao

et al. 2024

Preprint

View full text Add to dashboard Cite

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High precision dynamic measurement method for axial clearance based on time division multiplexing with dispersive interferometry

Duan¹,

Li²,

Bao³

et al. 2023

Opt. Express

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Rotor-stator axial clearance is a crucial design parameter affecting rotating machines’ efficiency and safety. To accurately measure the dynamic axial clearance in high-speed machinery, a precise method based on time division multiplexing with frequency domain interferometry has been proposed. This method has proven robust and accurate through simulations and experiments. The inclusion of an optical switch enables the utilization of dispersive interferometry(DPI) and time division multiplexing for multiple channels of the light source. It achieves a static accuracy of 1.5 µm for a 15 mm range and a dynamic accuracy of 9 µm at 3000 rpm.

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Axial clearance measurement method based on wavelength division multiplexing with all-fiber microwave photonic mixing

Yu,

Duan,

et al. 2024

Opt. Express

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Rotor-stator axial clearance plays a pivotal role in ensuring the safety and efficiency of major rotating machinery. This paper introduces an innovative clearance measurement method based on wavelength division multiplexing (WDM) combined with all-fiber microwave photonic mixing. The method is distinguished by large measurement range, high accuracy and low drift. The WDM-based common optical path structure is established. A comprehensive theoretical model of axial clearance drift determined by wavelength and temperature is developed based on the thermo-optic effect of optical fiber material. To efficiently separate measurement and reference light at the probe, the optical design for a compact optical bandpass filter (OBPF) fiber sensor probe is proposed. The performance of the method is substantiated by simulations and experiments. The results demonstrate an accuracy of better than 2.8µm over a 23.5 mm range, surpassing existing methods. The method's capability to mitigate temperature-induced drift is further confirmed through high-temperature drift and comparative experiments.

show abstract

High-accuracy measurement system for rotor-stator axial clearance in narrow spaces based on all-fiber microwave photonic mixing

Cited by 5 publications

References 30 publications

An axial clearance measurement method based on time-frequency analysis for high speed target in narrow space

An axial clearance measurement method based on time-frequency analysis for high speed target in narrow space

High precision dynamic measurement method for axial clearance based on time division multiplexing with dispersive interferometry

Axial clearance measurement method based on wavelength division multiplexing with all-fiber microwave photonic mixing

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