Thin fiber-based Mach-Zehnderinterferometric sensor for measurement ofliquid-level, refractive index, temperature andaxial strain
2020
An all-fiber Mach–Zehnder interferometric sensor capable of
measuring liquid level, refractive index (RI), temperature, and axial
strain is proposed and experimentally demonstrated. The proposed sensor is
based on a fiber ball–thin fiber (TF)–core-offset structure sandwiched
between two standard single-mode fibers. The variations of ambient liquid
level, RI, temperature, and axial strain cause the change of phase
difference between the cladding modes and the core mode, which leads to
the shift of interference spectrum. The wavelength shifts of three
resonant dips in the transmission spectrum are used to investigate the
sensing characteristics of the sensor. Experimental results show that the
sensor with TF length of 20 mm exhibits high RI and liquid-level
sensitivities of $ - {131.7092}\;{\rm nm/RIU}$−131.7092nm/RIU and $ -
{120.7}\;{\rm pm/mm}$−120.7pm/mm at a wavelength of 1589.5 nm. Meanwhile,
the sensor is insensitive to temperature and axial strain, and the maximum
sensitivities are 0.0390 nm/°C and $ - {4}.{84}\; \times \;{{10}^{ -
4}}\;{\rm nm}/\unicode{x00B5} \varepsilon $−4.84×10−4nm/µe,
respectively. In addition, the sensor shows superiority in measuring
multiple parameters simultaneously.
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