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首页> 外文期刊>Optical fiber technology >Multimode interferometer based on no-core fiber with GQDs-PVA composite coating for relative humidity sensing
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Multimode interferometer based on no-core fiber with GQDs-PVA composite coating for relative humidity sensing

机译：基于No-Core纤维的多模干涉仪，GQDS-PVA复合涂层相对湿度传感

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摘要

A simple fabrication multimode interferometer (MMI) with graphene quantum dots (GQDs) and polyvinyl alcohol (GQDs-PVA) composite for relative humidity (RH) measurement is proposed and verified in this letter. The MMI includes two sections of single-mode fiber (SMF) and a length of 1.5 cm no-core fiber (NCF) is spliced between two sections of SMF, one of the splicing point is normal fused and the other splicing point is offset fusion splicing. The GQDs-PVA composite is prepared using a magnetic stirrer, and then is transferred to the surface of NCF by dip-coating machine. Refractive index of GQDs-PVA composite decreases with the increase of RH values caused by porous surface and water absorption characteristics of GQDs-PVA nanoparticle, which will lead to changes in the peak intensity of the interference spectrum. Experiment is executed at room temperature and the results indicate that the resonance intensity would decrease and the total intensity reduction of the interference spectrum was -20.473 dB with the measurement range changing from 38.8% RH to 88.65% RH. In addition, the proposed sensor presents good reversibility and repeatability. In a whole, the proposed sensor has simple structure, small size, low cost, high sensitivity and great repeatability.
机译：提出了一种简单的制造多模与具有石墨烯量子点（GQDS）和相对湿度（RH）测量的聚乙烯醇（GQDS-PVA）复合材料的简单制造多模干涉仪（MMI），并在这封信中验证。 MMI包括单模光纤（SMF）的两个部分，长度为1.5cm无核心光纤（NCF）在SMF的两个部分之间拼接，其中一个拼接点是正常的融合，另一个拼接点是偏移融合拼接。使用磁力搅拌器制备GQDS-PVA复合材料，然后通过浸涂机转移到NCF的表面。 GQDS-PVA复合材料的折射率随着由GQDS-PVA纳米粒子的多孔表面和吸水特性引起的RH值的增加而降低，这将导致干扰光谱的峰值强度的变化。实验在室温下执行，结果表明，共振强度会降低，干扰谱的总强度降低为-20.473dB，测量范围从38.8％RH变为88.65％RH。此外，所提出的传感器呈现出良好的可逆性和可重复性。总的来说，建议的传感器结构简单，尺寸小，成本低，灵敏度高，重复性很大。

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