Abstract
An optical fiber microdisplacement sensor based on symmetric Mach-Zehnder interferometer (MZI) with a seven-core fiber and two single-mode fiber balls is proposed. The rationality and manufacturing process of the MZI sensing structure are analyzed. The fabrication mechanism of the Mach-Zehnder sensor by CO2 laser is described in detail. Experimental results show that temperature sensitivities of the two dips are 98.65 pm/°C and 89.72 pm/°C, respectively. The microdisplacement sensitivities are 2017.71 pm/mm and 2457.92 pm/mm, respectively. The simultaneous measurement of temperature and microdisplacement is demonstrated based on the sensitive matrix. The proposed Mach-Zehnder interference sensor exhibits the advantages of compact structure, simple manufacturing process, and high reliability.
Highlights
Microdisplacement sensors have wide applications in automatic equipment, robots, and road and bridge management [1,2,3,4,5,6]
Experimental results show that the microdisplacement sensitivity is 1.93 dB/μm and the temperature sensitivity is 0.023 dB/°C, so the cross-sensitivity effect on the proposed sensor can be neglected in practical applications
We only consider the dominant interference caused by the optical path difference (OPD) induced by the central core mode and the surrounding core mode of the multi-core fiber (MCF) [16], so this structure still can be regarded as an Mach-Zehnder interferometer (MZI) model [17], the transmission spectrum intensity of the proposed interferometer can be explained as
Summary
Microdisplacement sensors have wide applications in automatic equipment, robots, and road and bridge management [1,2,3,4,5,6]. In 2013, Chen et al [13] proposed a micro-displacement sensor with a core-offset structure. Experimental results show that the microdisplacement sensitivity is 1.93 dB/μm and the temperature sensitivity is 0.023 dB/°C, so the cross-sensitivity effect on the proposed sensor can be neglected in practical applications. It cannot realize the measurement of temperature and microdisplacement simultaneously. The structure needs to reasonably control the multi-mode optical fiber welding parameters, higher requirements for machining process and the displacement measurement which has not been realized. An optical fiber microdisplacement sensor based on symmetric Mach-Zehnder interferometer with a seven-core fiber and two single-mode fiber balls is proposed.
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