Abstract
A salinity sensor based on the principle of Mach-Zehnder interferometer (MZI) is presented and verified in this letter, which has certain advantages in the sensitivity and cost of the salinity sensor. This structure consists of a lead-in single-mode fiber (SMF), a small section of C-type micro-structured optical fiber (CMOF), a multi-mode fiber (MMF), and a lead-out single-mode fiber (SMF), which can be referred to as an SCMS structure for short. According to the experiment results, the salinity sensitivity of the sensing probe can reach − 3.25 nm/‰ with linearity of 0.999 when the CMOF is about 500 µm of the length. In addition, its refractive index (RI) sensitivity can be more than 10000 nm/RIU. Moreover, the sensing probe has a relatively good detection limit, namely 0.1‰. At the same time, it also provides a low-cost fabrication way to realize the direct contact with and exchange of the fluid being measured, and the sensor proposed has the prospect of monitoring ocean salinity.
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