- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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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
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Monitoring of type IV composite pressure vessels with multilayer fully integrated optical fiber based distributed strain sensing
摘要： We present the results of distributed fiber optic strain sensing for condition monitoring of a hybrid type IV composite fully wrapped pressure vessel using multilayer integrated optical fibers. Distributed strain sensing was performed for a total number of 252,000 load cycles until burst of the vessel. During this ageing test material fatigue could be monitored and spatially localized. Critical material changes were detected 17,000 cycles before material failure. Results have been validated by acoustic emission analysis.
关键词： Hybrid composite pressure vessel,Acoustic emission analysis,Structural health monitoring,Distributed fiber optic sensing
更新于2025-09-23 15:19:57
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - A Promising SPR Sensor with Single mode- Multimode-Single mode Fiber Embedding Microcavity
摘要： A cascaded fiber device is proposed basing on a cascaded structure. The device is designed with single mode-multimode-single mode fiber, with a microcavity in the central position of MMF. To get higher energy on the surface of the device, the structure is optimized, which means a strong SPR signal would be excited and a low detection limit would be get. Further, the transmission modes in cavity wall are analyzed, the fundamental modes are found to be the dominant modes.
关键词： Surface Plasmon Resonance,microcavity,Fiber optic sensing,cascade structure
更新于2025-09-19 17:15:36
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Analysis of Operation of Photonic Integrated Interrogators for Fiber Optic Sensor Networks
摘要： In this work we present and discuss our solutions of photonic integrated interrogators for application in a novel fiber-optic sensing system, dedicated to monitoring condition of a patient exposed to magnetic resonance imaging (MRI) scanning procedure. The monitoring system makes use of multiple fiber Bragg grating (FBG) based sensors, which offer the advantages of high sensitivity and immunity to strong magnetic fields and simultaneously do not affect the results of an MRI scan. Furthermore, the fact that many gratings can be inscribed within a single optical fiber simplifies the architecture of the sensing network.
关键词： fiber Bragg grating,MRI,fiber-optic sensing system,photonic integrated interrogators,monitoring system
更新于2025-09-12 10:27:22
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Application of Raman and Brillouin Scattering Phenomena in Distributed Optical Fiber Sensing
摘要： We present a review of the basic operating principles and measurement schemes of standalone and hybrid distributed optical fiber sensors based on Raman and Brillouin scattering phenomena. Such sensors have been attracting a great deal of attention due to the wide industrial applications they offer, ranging from energy to oil and gas, transportation and structural health monitoring. In distributed sensors, the optical fiber itself acts as a sensing element providing unique measurement capabilities in terms of sensing distance, spatial resolution and number of sensing points. The most common configuration exploits optical time domain reflectometry, in which optical pulses are sent along the sensing fiber and the backscattered light is detected and processed to extract physical parameters affecting its intensity, frequency, phase, polarization or spectral content. Raman and Brillouin scattering effects allow the distributed measurement of temperature and strain over tens of kilometers with meter-scale spatial resolution. The measurement is immune to electromagnetic interference, suitable for harsh environments and highly attractive whenever large industrial plants and infrastructures have to be continuously monitored to prevent critical events such as leakages in pipelines, fire in tunnels as well as structural problems in large infrastructures like bridges and rail tracks. We discuss the basic sensing mechanisms based on Raman and Brillouin scattering effects used in distributed measurements, followed by configurations commonly used in optical fiber sensors. Hybrid configurations which combine Raman and Brillouin-based sensing for simultaneous strain and temperature measurements over the same fiber using shared resources will also be addressed. We will also discuss advanced techniques based on pulse coding used to overcome the tradeoff between sensing distance and spatial resolution affecting both types of sensors, thereby allowing measurements over tens of kilometers with meter-scale spatial resolution, and address recent advances in measurement schemes employing the two scattering phenomena.
关键词： distributed fiber optic sensing,Raman scattering,non-linear phenomena in optical fibers,Brillouin scattering,strain and temperature measurements
更新于2025-09-12 10:27:22
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Parts-per-billion-level detection of hydrogen sulfide based on near-infrared all-optical photoacoustic spectroscopy
摘要： A highly sensitive trace hydrogen sulfide (H2S) gas sensing scheme based on all-optical photoacoustic spectroscopy is demonstrated. A high-power erbium-doped fiber amplified near-infrared laser is used as a light source for acoustic excitation. Meanwhile, the second-harmonic photoacoustic signal is measured by a fiber-optic cantilever microphone which is equipped with a white-light interferometric readout. For sensitivity improvement, the demodulated digital photoacoustic signal is processed by a virtual lock-in amplifier. The continuous H2S measurement experiment shows the ability of real-time response. A detection limit is achieved to be 33 ppb with a 10 s measurement time at the wavelength of 1576.29 nm. With both the excitation light and the probe light being transmitted by optical fibers, the designed sensing system has the advantages of remote detection and immunity to electromagnetic interference.
关键词： Trace gas detection,Photoacoustic spectroscopy,Fiber-optic sensing,Cantilever microphone,Near-infrared laser
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) - Portland, OR, USA (2018.11.13-2018.11.14)] 2018 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) - Surface Mounted Fiber Optic Sensors for Accurate Monitoring of Pressure Profiles Across an Airfoil
摘要： We present a low profile surface mounted fiber optic pressure sensor for monitoring pressure profiles across an airfoil surface. The device has been tested on a symmetric airfoil section in a wind tunnel and shows excellent agreement with standard pressure taps.
关键词： photonics,fiber optic sensing,Airfoil pressure profile
更新于2025-09-09 09:28:46