Jiabin Wang, Xinzhe Zeng, Jian Zhou, Jiayu Hao, Xingyu Yang, Yue Liu, Wenhuan Chen, Song Li, Yunxiang Yan, Tao Geng, Weimin Sun, Libo Yuan. Highly sensitive torsion sensor based on Mach–Zehnder interference in helical seven-core fiber taper[J]. Chinese Optics Letters, 2023, 21(4): 041205
- Chinese Optics Letters
- Vol. 21, Issue 4, 041205 (2023)
Fig. 1. (a) Schematic diagram of the MHSTM structure; (b) micrograph of the MHSTM structure under phase contrast microscope; (c) cross-sectional micrograph of the SCF.
Fig. 2. Configuration of the homemade fiber fusion tapering and rotating platform.
Fig. 3. (a) Transmission spectrum of the MHSTM; (b) FFT spectrum of the transmission spectrum.
Fig. 4. Experimental setup for torsion sensitivity measurement.
Fig. 5. (a) Changing spectrum as the torsion force is applied; (b) piecewise linear fit of dip wavelength as a function of twist rate.
Fig. 6. Piecewise linear fitting curves of wavelength of the (a) dip B and (b) dip C to the torsion rate.
Fig. 7. Linear fits of the dip wavelength to the torsion rate. (a) Under different taper waists w; (b) under different helical pitches Λ.
Fig. 8. (a) Transmission spectrum evolution as temperature changes; (b) linear fit of the dip wavelength as a function of temperature.
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Table 1. Comparison of Torsion Sensors
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