1 之江实验室光纤传感研究中心，浙江 杭州 310027
2 浙江大学海洋学院，浙江 舟山 316021
3 电子科技大学信息与通信工程学院，四川 成都 611731
报道了一种高性能大孔径分布式光纤水听拖曳阵列，其总长度为150 m，声学传感段长度为100 m，具有192个传感单元，采用单根光纤离散增敏制备而成，无需其他分离器件。传感基元通过驻波桶标定，在20~1000 Hz，平均声压灵敏度达到-127.44 dB（re rad/μPa）。阵列同时装配了自研的姿态感知模块，可实现拖曳过程的实时姿态获取。针对所研制的大规模分布式光纤水听拖曳阵列，开展了湖试综合测试，6 kn拖速下阵列声学段的倾角仅为7.8°，将192个传感单元数据波束合成后得到了16.87 dB的空间增益，传感器表现出了优异的综合性能。该高性能大规模分布式光纤水听拖曳阵列为光纤水听器发展提供了一条全新的技术路线，有力推动了基于DAS的“第三代声呐技术”的发展。
光纤光学 光纤水听器 光纤水听拖曳阵列 分布式光纤声波传感 声压灵敏度 姿态感知 目标轨迹跟踪
Author Affiliations
Abstract
1 Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu 611731, China
2 School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
3 Research Center for Optical Fiber Sensing, Zhejiang Laboratory, Hangzhou 310000, China
4 Warsaw University of Technology, Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw, Poland
Fiber optofluidic laser (FOFL) integrates optical fiber microcavity and microfluidic channel and provides many unique advantages for sensing applications. FOFLs not only inherit the advantages of lasers such as high sensitivity, high signal-to-noise ratio, and narrow linewidth, but also hold the unique features of optical fiber, including ease of integration, high repeatability, and low cost. With the development of new fiber structures and fabrication technologies, FOFLs become an important branch of optical fiber sensors, especially for application in biochemical detection. In this paper, the recent progress on FOFL is reviewed. We focuse mainly on the optical fiber resonators, gain medium, and the emerging sensing applications. The prospects for FOFL are also discussed. We believe that the FOFL sensor provides a promising technology for biomedical analysis and environmental monitoring.
Optical fiber sensors optofluidic laser microstructured optical fiber optical microcavity biochemical sensors Photonic Sensors
2021, 11(2): 262
Author Affiliations
Abstract
1 Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
2 Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China
3 MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
4 MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China
5 e-mail: zhutao@cqu.edu.cn
Acousto-optic interactions, employed in the ultrafast laser regulation, possess remarkable advantages for fast tuning performance in a wide spectral range. Here, we propose an ultrafast fiber laser whose wideband tunability is provided by an acousto-optic structure fabricated with an etched single-mode fiber. Because of the laser polarization conversion induced by the coupling between the core and cladding vector modes in the etched fiber, a band-pass characteristic of the acousto-optic interaction is achieved to effectively regulate the inner-cavity gain range. Cooperating with a saturable absorber based on single-wall carbon nanotubes (SWCNTs) with polarization robustness, a soliton operating state is achieved in the tunable erbium-doped fiber laser. By controlling the acoustical wave frequency from 1.039 to 1.069 MHz, this soliton laser can be conveniently tuned in a wide spectral range from 1571.52 to 1539.26 nm. Meanwhile, the laser pulses have near-transform-limited durations stably maintaining less than 2 ps at different wavelength channels, owing to the broadband nonlinear absorption of SWCNTs.
Photonics Research
2019, 7(7): 07000798
电子科技大学光纤传感与通信教育部重点实验室，四川 成都 611731
本文介绍了本课题组在光纤微流激光传感器和无源光纤微流传感器两方面的研究进展。光纤微流激光传感器利用光纤微流激光的输出变化来探测生化参数的改变。光纤截面作为环形微腔形成光反馈，增强了腔内光子和待测物质的相互作用，从而提高了微流激光的传感灵敏度。此外，光纤尺寸均匀，易低成本、批量制作光纤微腔，可制备高重复性或一次性使用的光纤微流激光。本文还介绍了基于光力/光热效应的无源光纤微流传感器。该类传感器利用光产生的力学或热学效应对微流体进行温度、流速、浓度传感，具有灵活性高、集成度好、多功能、可重构等特点。
光纤微流传感 光纤微流激光 光纤传感 光力效应 光热效应 fiber optofluidics sensor fiber optofluidics laser fiber sensing laser induced force photo-thermal effect
Author Affiliations
Abstract
1 Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu, 611731, China
2 National Center of Quality Inspection for Sensors, National Institute of Measurement and Testing Technology, Chengdu, 610021, China
A fiber-optic Fabry-Perot hydrogen sensor was developed by measuring the fringe contrast changes at different hydrogen concentrations. The experimental results indicated that the sensing performance with the Pd-Y film was better than that with the Pd film. A fringe contrast with a decrease of 0.5 dB was detected with a hydrogen concentration change from 0% to 5.5%. The temperature response of the sensor was also measured.
Optical fiber sensor hydrogen sensor Pd-Y film fringe contrast temperature characteristics Photonic Sensors
2015, 5(2): 142
Author Affiliations
Abstract
Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu, 611731, China
The excitation of the surface field and evanescent enhancement in the graphene have shown sensitive to the refractive index of surrounding media and potential applications in high-sensitivity biochemical sensing. In this paper, we investigate the graphene-coated microfiber Bragg gratings (GMFBGs) with different diameters for ammonia gas sensing. The maximum sensitivity with 6 pm/ppm was achieved experimentally when the microfiber’s diameter was about 10 μm. Moreover, by adjusting the diameter of the GMFBG, the sensing performance of the GMFBGs could be optimized. Experimental results indicated that GMFBGs with the diameter of 8 μm – 12 μm would show the characteristics of the high sensitivity, relative low attenuation, and large dynamic range.
FBG graphene ammonia gas sensing structure optimization Photonic Sensors
2015, 5(1): 84–90
Author Affiliations
Abstract
Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu, 611731, China
A fiber-optic humidity sensor has been fabricated by coating a moisture sensitive polymer film to the fiber Bragg grating (FBG). The Bragg wavelength of the polyimide-coated FBG changes while it is exposed to different humidity conditions due to the volume expansion of the polyimide coating. The characteristics of sensors, including sensitivity, temporal response, and hysteresis, were improved by controlling the coating thickness and the degree of imidization during the thermal curing process of the polyimide. In the relative humidity (RH) condition ranging from 11.3% RH to 97.3% RH, the sensitivity of the sensor was about 13.5 pm/% RH with measurement uncertainty of ±1.5% RH.
Fiber Bragg grating humidity sensing moisture sensitive Photonic Sensors
2015, 5(1): 60–66
Author Affiliations
Abstract
1 Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu, 611731, China
2 National Institute of Measurement and Testing Technology, Chengdu, 610021, China
3 School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, NSW 2052, Australia
A novel optical microfiber asymmetric Fabry-Perot interferometric (MAFPI) sensor is developed for simultaneous measurement of force and temperature. The MAFPI structure is formed by a weak fiber Bragg grating (FBG), a section of the microfiber, and a cleaved fiber end surface. The narrowband beam reflected from the low-reflectivity FBG and the broadband beam from the Fresnel reflection interfere lead to its unique sensing performance. The force sensing is performed by detecting the bending-loss induced fringe contrast changes, while the Bragg wavelength shift is employed for temperature measurement. Sensitivities of 9.8 pm/℃ and 0.025 dB/μN were obtained experimentally for temperature and force measurements, respectively.
Optical microfiber weak FBG interferometric Photonic Sensors
2014, 4(3): 242
Author Affiliations
Abstract
1 Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, 611731, China
2 Safety Environment Quality Surveillance & Inspection Research Institute of SPA, Guanghan, 611731, China
For the health monitoring of the offshore drilling platform in the salt-fog environment, three nonmetallic materials, i.e., silica, FR-4 epoxy board and sheet molding compound (SMC), with the good anti-corrosion ability were chosen as the packaging materials for the fiber Bragg grating (FBG) strain sensors. By selecting a highly sensitive structure of the fiber Bragg grating strain sensor, the performances of the sensors with three materials were investigated both numerically and experimentally. The strain sensitivities were 3.76 pm/με, 3.02 pm/με and 3.03 pm/με, respectively. The linearity was better than 0.998. It provides useful information for developing sensors for the marine engineering.
Offshore drilling platform fiber Bragg grating strain sensor nonmetallic materials Photonic Sensors
2013, 3(3): 267
Author Affiliations
Abstract
Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, 611731, China
The fiber Bragg grating (FBG) strain sensor is used in the oil and gas derricks for the health monitoring. The system consisted of the FBG strain sensors, optical interrogator and monitoring software. 64 sensors were installed on a derrick for loading and unloading tests. The results showed that the monitoring system had the advantages of the high accuracy, good repeatability, large capacity and real-time monitoring ability.
Fiber Bragg grating Derrick strain monitor Photonic Sensors
2013, 3(3): 237
