Real-time monitoring for composites forming process based on superstructure fiber grating sensing and linear demodulation

Zhan, Yage, Zhang Wenzhuo, Xu Long, Han Min, Wang Ziting

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Zhan Ya., Zhang W., Xu L., Han M., Wang Z. Real-time monitoring for composites forming process based on superstructure fiber grating sensing and linear demodulation [in English] // Opticheskii Zhurnal. 2023. V. 90. № 9. P. 91–101. http://doi.org/10.17586/1023-5086-2023-90-09-91-101

Zhan Ya., Zhang W., Xu L., Han M., Wang Z. Real-time monitoring for composites forming process based on superstructure fiber grating sensing and linear demodulation (Мониторинг процесса формования композитов с помощью сенсора на основе оптоволоконных брэгговских решeток при использовании линейной демодуляции в реальном времени) [на англ. яз.] // Оптический журнал. 2023. Т. 90. № 9. С. 91–101. http://doi.org/10.17586/1023-5086-2023-90-09-91-101

For citation (Journal of Optical Technology):

Yage Zhan, Wenzhuo Zhang, Long Xu, Min Han, and Ziting Wang, "Real-time monitoring for the composite forming process based on superstructure fiber grating sensing and linear demodulation," Journal of Optical Technology. 90(9), 545-552 (2023). https://doi.org/10.1364/JOT.90.000545

Abstract:

Subject of study. An all-fiber grating sensor system has been applied to composites forming monitoring for real-time monitoring of the changes of temperature and strain in the forming process. The purpose of the work is optimization of sensor parameters based on fiber-optic Bragg gratings by reducing the effect of photoelectric conversion errors during signal demodulation. Method. Two kinds of fiber gratings, including polarization maintaining fiber grating have been used as sensing elements and demodulation elements respectively. The all-fiber sensing system for real-time monitoring of composites forming process has been built. The system acquires the optical signals related to the parameters to be measured, records the optical power of the signal and converts it to the wavelength shift in real time. The temperature and strain can be calculated real-time according to the wavelength. The fiber grating with linear spectrum used as a linear demodulator is designed and developed by ourselves. Main results. The demodulator has the linear demodulation in 1544–1556 nm with a linearity of 2.21 dB/nm and the sensor has a dynamic range of 1200 °C and 11000 µe. The experimental results show that the all-fiber grating sensor system we designed can clearly reflect the changes of temperature and strain of the composites during the forming process. In the steady state, the maximum temperature difference is less than 10 °C, the maximum temperature difference is less than 100 µe, which is consistent with the actual situation. Practical significance. The demonstrated feasibility of the sensor system provides a new thought of demodulation and monitoring for composites forming process. Through the further optimization, it can realize more rapid and accurate real-time monitoring for composites forming process.

Keywords:

real-time monitoring, superstructure fiber grating, linear demodulation, temperature, strain

Acknowledgements:

Supported by Natural Science Foundation of Shanghai (Grant № 21ZR1402400) and Nonlinear Science Institute of Donghua University

OCIS codes: 060.2370

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