Experimental study demonstrates dual temperature and pressure measurement using a cascaded fiber-optic sensor, highlighting a simple and reliable design for environmental monitoring.
A fiber-optic sensor is reported for simultaneous measurement of temperature and pressure. The structure is cascaded by a Mach-Zehnder interferometer (MZI) of a single mode fiber (SMF)-thin core fiber (TCF)–SMF unit and anti-resonance reflective optical waveguide (ARROW) of an SMF-capillary-SMF unit. The sensing principles and properties of the MZI and the ARROW were analyzed and the response to temperature and pressure were characterized. The experimental results show temperature sensitivity of ∼0.130 nm/°C accompanied by a linear fitting coefficient of ∼0.997, and pressure sensitivity of ∼3.32 nm/MPa with a linearity of ∼0.994. This work demonstrates an easy-to-implement structure that provides novel and reliable performance for environmental monitoring and engineering practice.
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Huang et al. (2025) studied this question.
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