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oe1(光电查) - 科学论文

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  • A curvature sensor based on single mode-no-core-twisted single mode fiber structure

    摘要： A high sensitivity curvature sensor based on single mode-no-core-twisted single mode (SNTS) fiber structure is proposed. The configuration is simply formed by twisting a section of single mode fiber (SMF) in the single mode-no-core-single mode structure. Due to the twist is applied, the cladding mode excited in the SMF can be recoupled into the core. The core modes and cladding modes excited in the same fiber form a Mach-Zehnder interference (MZI) which is sensitive to the curvature change. A high sensitivity of 16.28 nm/m?1 with a good linearity has been achieved in the range of 0.96–1.92 m?1, and the repeatability of the curvature sensor is 3.6 × 10?3 nm/m?1. The temperature sensitivity is 0.03 nm/°C within the temperature range from 30 to 100 °C.

    关键词： Single mode-no-core-twisted,Curvature sensor,Fiber,Mach-Zehnder interference

    更新于2025-11-28 14:23:57

  • Hydrogen Sulfide Gas Sensor Based on Titanium Dioxide/Amino-Functionalized Graphene Quantum Dots Coated Photonic Crystal Fiber

    摘要： A novel photonic crystal fiber (PCF) Mach-Zehnder interferometer (MZI) was proposed for detecting hydrogen sulfide (H2S) gas. Two single-mode fibers (SMFs), two multi-mode fibers (MMFs), and a PCF are sequentially fused to form a MZI with SMF-MMF-PCF-MMF-SMF structure. Titanium dioxide/amino-functionalized graphene quantum dots (TiO2/af-GQDs) composite is coated on the surface of PCF as sensing membrane. The fabricated sensing membrane is characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Furthermore, the properties of the sensor are examined. The results show that a uniform TiO2/af-GQDs film with a thickness of 1 μm is successfully coated on the surface of the PCF. The sensor has a sensitivity of 26.62 pm/ppm, showing a good linearity and selectivity for H2S in the range of 0~55 ppm. The response time and recovery time are about 68 s and 77 s, respectively. The sensor has the advantages of low cost, small volume and simple structure, which is suitable for on-line monitoring of H2S.

    关键词： Mach-Zehnder interference,Graphene quantum dots,Titanium dioxide,Fiber-optic sensing,Hydrogen sulfide

    更新于2025-09-23 15:21:01