Accurate measurement of strain parameters for spacecraft structure based on optical fiber sensing

Ning Yang; Jiande Zhang; Peng Zheng; Bo Zhao; Hualiang Sun; Qiang Liu

doi:10.1117/12.2623086

27 March 2022 Accurate measurement of strain parameters for spacecraft structure based on optical fiber sensing

Ning Yang, Jiande Zhang, Peng Zheng, Bo Zhao, Hualiang Sun, Qiang Liu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121692S (2022) https://doi.org/10.1117/12.2623086
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

In order to achieve the high accuracy measurement of strain parameters of spacecraft structure with optical fiber sensors, a demodulation approach based on the composite wavelength reference of Fabry-Perot(F-P) etalon and acetylene(C₂H₂) gas cell is presented. In the approach, an adaptive threshold method is used to resolve the difficulty of peaks searching of F-P etalon waveform, which is caused by poor flatness of light source. Meanwhile, the strain sensitivity coefficient of optical fiber sensors is accurately obtained by a two-step method, so as to eliminate the influences of the sensor substrate and the bonding layer on the measurement. Finally, the measuring results of strain sensors are compensated with the temperature sensor to improve the measurement precision of strain parameters. The experiments results show that when the temperature variation range is 85°C(-25°C~60°C), the FBG wavelength demodulation deviation of the approach in this paper is within 3pm, while the relative measuring error of strain parameters is within 4%, which can realize the stable and high-precision measurement of the strain parameters of spacecraft structure.

Citation Download Citation

Ning Yang, Jiande Zhang, Peng Zheng, Bo Zhao, Hualiang Sun, and Qiang Liu "Accurate measurement of strain parameters for spacecraft structure based on optical fiber sensing", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121692S (27 March 2022); https://doi.org/10.1117/12.2623086

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