Temperature-insensitive strain measurement using a microwave photonic filter based on chirped fiber Bragg gratings

Jing Zhang; Yuanfen Zhou; Yunxin Wang; Dayong Wang

doi:10.1117/12.2692226

27 September 2023 Temperature-insensitive strain measurement using a microwave photonic filter based on chirped fiber Bragg gratings

Jing Zhang, Yuanfen Zhou, Yunxin Wang, Dayong Wang

Author Affiliations +

Proceedings Volume 12813, Asia-Pacific Optical Sensors Conference (APOS 2023); 128130F (2023) https://doi.org/10.1117/12.2692226
Event: Asia Pacific Optical Sensors Conference 2023, 2023, Tianjin, China

Abstract

A temperature-insensitive strain sensor based on a microwave photonic filter (MPF) is proposed. A Mickelson interferometer, formed by two identical chirped fiber Bragg gratings (FBGs), together with a broadband optical source, a phase modulator, a dispersion compensation fiber, and a photodetector, forms the MPF. Due to the dispersion effect of chirped FBG, the wavelength shift caused by strain will result in changes in signal transmission latency, which will then cause a drift on the central frequency of the MPF. An experiment was conducted to validate the proposed scheme. Experimental results show that frequency shift of MPF in response to strain with a sensitivity of 2.0 GHz is obtained for a measurement range of 0~1.8 mε. Besides, the system keeps stable within a temperature range from 30 °C to 100 °C.

Citation Download Citation

Jing Zhang, Yuanfen Zhou, Yunxin Wang, and Dayong Wang "Temperature-insensitive strain measurement using a microwave photonic filter based on chirped fiber Bragg gratings", Proc. SPIE 12813, Asia-Pacific Optical Sensors Conference (APOS 2023), 128130F (27 September 2023); https://doi.org/10.1117/12.2692226

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