High precision real-time non-contact measurement of rotor-stator axial gap in narrow space based on swept-wavelength interferometry with 1kHz speed

Xiuming Li; Fajie Duan; Xiao Fu; Zhibo Liu; Ruijia Bao; Jiajia Jiang

doi:10.1117/12.2611997

8 July 2022 High precision real-time non-contact measurement of rotor-stator axial gap in narrow space based on swept-wavelength interferometry with 1kHz speed

Xiuming Li, Fajie Duan, Xiao Fu, Zhibo Liu, Ruijia Bao, Jiajia Jiang

Author Affiliations +

Proceedings Volume 12282, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 122820U (2022) https://doi.org/10.1117/12.2611997
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

In our work, a rotor-stator axial gap non-contact real-time measurement system based on SWI with an auxiliary interferometer for nonlinearity correction is established. The measurement speed is 1kHz and the principle is given. The data of 6-10mm distance is collected, and the distance of each position is calculated by windowed FFT and Hilbert transform respectively. The simulation results indicate that the measurement error of Hilbert algorithm is on the order of a fraction of nanometers, while that of FFT is micrometer level. However, FFT takes 36μs in one measurement which is three times faster than Hilbert algorithm. Both of the two meet the precision requirement of axial gap measurement, it helps us to choose the more appropriate algorithm according to the actual situation.

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Xiuming Li, Fajie Duan, Xiao Fu, Zhibo Liu, Ruijia Bao, and Jiajia Jiang "High precision real-time non-contact measurement of rotor-stator axial gap in narrow space based on swept-wavelength interferometry with 1kHz speed", Proc. SPIE 12282, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 122820U (8 July 2022); https://doi.org/10.1117/12.2611997

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