Journal
IEEE SENSORS JOURNAL
Volume 22, Issue 5, Pages 4090-4095Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3143696
Keywords
Optical microfiber coupler; dispersion turning point; axial strain sensing; spectral drift
Funding
- State Key Laboratory of Applied Optics [SKLAO2021001A03]
- Key Research and Development of Jilin Provincial Department of Science and Technology-Key Industrial Core Technology Research Project [20210201091GX]
- National Natural Science Foundation of China [62005101]
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In this study, a novel axial strain sensor based on OMC operating at DTP was designed to achieve high-sensitivity measurements of axial strain. The sensor was found to be highly sensitive to axial strains when the effective refractive index difference between the odd and even modes in the coupling region of the OMC is equal to zero, as confirmed by theoretical calculations and experimental results.
A novel axial strain sensor based on an optical microfiber coupler (OMC) operating at the dispersion turning point (DTP) was designed to realize high-sensitivity measurements of axial strain. First, we explain the measurement principle of axial strain sensors based on microfiber couplers. Then, we calculate the measurements, with the theoretical calculations showing that the sensor has high sensitivity when the effective refractive index (ERI) difference between the odd and even modes in the coupling region of the OMC is equal to zero. Finally, we carried out axial tensile experiments on the OMC. The results show that the OMC has the highest axial strain sensitivity when it operates at the DTP. The maximum sensitivity is 166.9 pm/mu epsilon, with a linear range of 0-400 mu epsilon. The sensor is highly sensitive to axial strains and has a simple structure. It has broad application prospects in the measurement of mechanical quantities such as strain, acceleration and vibration.
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