Abstract
This study presents a simple Mach–Zehnder interferometer (MZI) to obtain the bimodal characteristics that realize simultaneous measurement of strain and temperature through cascading an ultra-long-period fiber grating and a knob-shaped taper. We obtain the multi-dip feature from the MZI, and the Dips 2 and 5 are selected from 11 interference dips. Experimental results indicated that the wavelength sensitivities of Dips 2 and 5 are − 0.54 nm mε−1 and 0.058 nm °C−1, and − 0.53 nm mε−1 and 0.055 nm °C−1 to strain and temperature, respectively. The depth sensitivities are − 3.3 dB mε− 1, − 0.015 dB °C−1 and −5.8 dB mε−1, and 0.06 dB °C−1 for Dips 2 and 5, respectively. It is concluded that the proposed structure is suitable for simultaneous strain and temperature measurements.
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Acknowledgements
This work is funded by the National Nature Science Foundation of China (Grants Nos. 61377084, 41174161, and 11704086), the 111 project (B13015), the Fundamental Research Funds for the Central Universities and the Harbin Engineering University. The science technology creative foundation for young scientists of Harbin City (GrantsNos.2015RQQXJ087, 2015RAQXJ055). Research Supported by the Opening Project of Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences (CAS-KLAOT-KF201501).
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Tong, C., Chen, X., Zhou, Y. et al. Ultra-long-period fiber grating cascaded to a knob-taper for simultaneous measurement of strain and temperature. Opt Rev 25, 295–300 (2018). https://doi.org/10.1007/s10043-018-0419-2
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DOI: https://doi.org/10.1007/s10043-018-0419-2