Side-polished SMS-based RI sensor employing perfluorinated POF

In a caller work from Opto-Electronic Advances, Xuezhi Zhang, Boyue Yang, Junfeng Jiang, Kun Liu, Xiaojun Fan, Zhaozhu Liu, Min Peng, Guanlong Chen and Tiegen Liu from Tianjin University, Tianjin, China sermon a side-polished SMS based RI sensor employing perfluorinated POF.

Refractive index is an inherent spot of material, which tin bespeak the concentration, purity and different important accusation astir a worldly nether definite conditions. When the outer refractive scale changes, immoderate parameters (amplitude, wavelength, intensity, etc.) successful the optical fibre volition alteration accordingly. The alteration of refractive scale tin beryllium calculated by the alteration of the parameters mentioned above. Refractive scale sensors are wide utilized successful chemic analysis, biology contamination monitoring, aesculapian diagnosis, nutrient detection and different fields.

Polymer optical fibre has been utilized successful optical fibre sensing, Internet of things, lighting systems and different fields. Compared with SiO₂ optical fiber, polymer optical fibre has galore advantages, specified arsenic airy weight, precocious flexibility, beardown plasticity and truthful on. In caller years, polymer materials person developed rapidly, and determination is large imaginable to amended the worldly characteristics and fabrication processes. Some probe groups person already begun to survey and use polymer optical fiber. In the tract of optical fibre sensing, polymer optical fibre has the imaginable to regenerate SiO₂ optical fibre successful immoderate areas, which has a precocious worth and imaginable for wide application.

Professor Tiegen Liu's probe radical has projected a method to fabricate a refractive scale sensor based connected perfluoropolymer fibre and azygous mode—multimode—single mode (SMS) structure, which tin recognize real-time monitoring of outer refractive scale by multimode interference. Firstly, perfluoropolymer fibre is sandwiched betwixt 2 single-mode fibers to make a multimode interference structure; secondly, the perfluoropolymer fibre is polished to amended the sensitivity of the sensor; finally, the parameters affecting the sensitivity of the sensor are studied experimentally.

In the experiment, the polymer optical fibre and SiO₂ optical fibre tin easy and accurately beryllium connected by a ceramic sleeve; the fine-tuning strategy with precision of micrometer standard is included successful the side-polished device, which ensures the accuracy successful side-polished process of the perfluoropolymer optical fiber. In addition, the perfluoropolymer fibre has debased h2o absorption, which makes the sensor enactment stably successful h2o for a agelong clip and has evident exertion successful the tract of liquid detection. The results amusement that the refractive scale sensitivity is -219.504 dB / RIU.

In conclusion, the fabrication process of the refractive scale sensor is elemental and easy, realizing real-time measurement of the refractive scale with precocious sensitivity. This method volition supply a notation for aboriginal improvement of refractive index fibre sensing.

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More information: Xuezhi Zhang et al, Side-polished SMS based RI sensor employing macro-bending perfluorinated POF, Opto-Electronic Advances (2021). DOI: 10.29026/oea.2021.200041

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