Key Laboratory of Fiber Optic Sensing Technology and Information Processing

Wuhan, China

Key Laboratory of Fiber Optic Sensing Technology and Information Processing

Wuhan, China
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Han P.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Han P.,Wuhan University of Technology | Xie Y.,Wuhan University of Technology | Liu Y.,Wuhan University of Technology
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

Vibration active control is one kind of main methods to eliminate interference and improve machining accuracy. The premise of vibration active control is the precise measurement of micro-vibration signal whose frequency is upper 5 kHz. A full-fiber micro-vibration distributed sensor is designed using frequency modulated consecutive wave (FMCW) and light intensity modulation technology, aiming at the shortage of existing grating sensor used for micro-vibration signal measurement, such as low frequency, complex structure and individual measurement etc. Through piezoelectric transducer (PZT) micro-vibration measuring experiment and simulation, it can prove that top frequency of 60 kHz for distributed measurement is achieved.


Lee D.,Wuhan University of Technology | Lee D.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Tian Z.,Virginia Polytechnic Institute and State University | Huang C.,Wuhan University of Technology | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

A fiber optic high-temperature sensor with a low-fineness Fabry-Perot cavity formed by dielectric films on sapphire fiber tip is proposed and demonstrated. Experimental investigation shows that the sensor exhibits a sensitivity of 40.7pm/°C when the ambient temperature changes from 400°C to 1000°C. © 2014 SPIE.


Shuang Q.,Wuhan University of Technology | Shuang Q.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing
Sensors and Transducers | Year: 2013

In this paper, the author successfully proposed a new magnetic grid displacement data fitting model, based on partial least squares regression. Firstly, sinusoidal voltage is generated by the movement of magnetic sense hall on top of alnicos array. Then, handle the experimental data by the partial least squares fitting, obtained the relationship between values of Hall and displacement, and finally finish the displacement measure. The experiment results indicated that: This design can achieve displacement fitting goodness 99.98 % and maximum deviation of 0.1 mm. This method largely simplifies the production process of magnetic grid displacement sensor, reduces costs and achieves mass production. It has important implications in some special environment such as high temperature, low temperature, underwater and so on. © 2013 IFSA.


Liu Q.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Niu H.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Xu W.,Wuhan University of Technology | Zhang D.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing
Computer Networks | Year: 2014

Because of the increasing growth of spectrum utilization in wireless networks, dynamic spectrum allocation (DSA) using cognitive radio has recently attracted attention. DSA provides a promising communication paradigm to relieve the bottleneck that arises in the spectrum utilization of wireless networks. In a cognitive wireless network, deficient matching between user demands and spectrum resources can result in communication deterioration; however, superfluous matching can lead to inefficient spectrum utilization. In this study, a service-oriented, multi-attribute normalization model is developed that considers user demands and spectrum characteristics. Based on this model, a service-oriented DSA, which applies the graph coloring problem (GCP) and an enhanced particle swarm optimization (PSO) method, is proposed to efficiently satisfy user service demands and achieve better utilization and fairness rewards. The simulation results demonstrate that the algorithm satisfies the requirements for accurate spectrum allocations in cognitive wireless networks and performs better with respect to iteration efficiency and utilization rewards than the existing algorithms. © 2014 Elsevier B.V. All rights reserved.


Dai Y.,Wuhan University of Technology | Dai Y.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Yang M.,Wuhan University of Technology | Xu G.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Yuan Y.,Wuhan University of Technology
Optics Express | Year: 2013

A novel magnetic field sensor based on Terfenol-D coated fiber Bragg grating with spiral microstructure was proposed and demonstrated. Through a specially-designed holder, the spiral microstructure was ablated into the fiber Bragg grating (FBG) cladding by femtosecond laser. Due to the spiral microstructure, the sensitivity of FBG coated with magnetostrictive film was enhanced greatly. When the spiral pitch is 50 μm and microgroove depth is 13.5μm, the sensitivity of the magnetic field sensor is roughly 5 times higher than that of non-microstructured standard FBG. The response to magnetic field is reversible, and could be applicable for magnetic field detection. © 2013 Optical Society of America.


Liu Q.,Wuhan University of Technology | Liu Q.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Lu W.,Wuhan University of Technology | Lu W.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | And 2 more authors.
Proceedings of the 2014 International Conference on Innovative Design and Manufacturing, ICIDM 2014 | Year: 2014

Cognitive Radio is a promising technology to improve the spectrum utilization and ease the shortage of spectrum resources, and the quality of spectrum allocation directly determines the spectrum utilization. In order to explore a better solution for spectrum allocation in cognitive radio networks, a spectrum allocation model based on graph theory is established to describe the problem in this paper, and the novel Binary Firefly Algorithm is used to facilitate the spectrum allocation optimization, so as to maximize the cognitive network spectrum utilization and secondary user fair within the interference constraint. Finally, the simulation results demonstrate that the proposed spectrum allocation algorithm can perform better than a set of existing algorithms in network reward, secondary user's fairness and convergence. © 2014 IEEE.


Bai W.,Wuhan University of Technology | Yang M.,Wuhan University of Technology | Yang M.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Dai J.,Wuhan University of Technology | And 3 more authors.
Optics Express | Year: 2016

A novel relative humidity (RH) sensing network based on ultraweak fiber Bragg gratings (FBGs) is proposed and demonstrated. Experiment is demonstrated on a 5 serial ultra-weak FBGs sensing network chopped from a fiber array with 1124 FBGs. Experimental results show that the corresponding RH sensitivity varies from 1.134 to 1.832 pm/%RH when ambient environmental RH changes from 23.8%RH to 83.4%RH. The lowreflectance FBGs and time-division multiplexing (TDM) technology makes it possible to multiplex thousands of RH sensors in single optical fiber. © 2016 Optical Society of America.


Wen X.Y.,Wuhan University of Technology | Wen X.Y.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Huang J.,Clemson University | Xiao H.,Clemson University | And 2 more authors.
Measurement Science and Technology | Year: 2014

A zinc oxide (ZnO)-coated single mode-multimode-single mode fiber (SMS) structure interrogated by a fiber ring laser has been developed as a chemical sensor. Response to relative humidity (RH) and ethanol volatilization was evaluated by tracking the wavelength shifts of the output laser line in different moisture environments and ethanol solutions, respectively. For humidity sensing a linear response with a measurement range of 4-96% RH, and a sensitivity of 0.06 nm per %RH were obtained. As for ethanol volatilization sensing obvious wavelength blue shift was observed for the sensor immersed in 50% and 62% ethanol solution, while no variation could be detected in pure ethanol solution (purity larger than 97%). With the advantages of low cost, ease of fabrication and sensitive response, ZnO-coated SMS interrogated with a fiber ring laser was demonstrated to be an effective sensor for humidity and ethanol volatilization sensing. © 2014 IOP Publishing Ltd.


Guo Y.-X.,Wuhan University of Technology | Guo Y.-X.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Zhang D.-S.,Wuhan University of Technology | Zhang D.-S.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | And 3 more authors.
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2014

This paper describes the structural design, performance test and application of a surface-mounted FBG strain sensor for the load test of a highway bridge. A stainless steel packaged elastic structure with the capacity of strain sensitization and adjustment is proposed. An FBG is mounted in the cylinder located in the center section of the sensor. The cross sectional area of the center cylinder is smaller than that of other parts of the sensor. The magnification factor of strain measurement could be adjusted by changing the length and cross sectional area of the center cylinder, which is the basic principle of the sensitization. A reference test method is also designed for the calibration of the strain sensor. The strain measurement test results are consistent with the theoretical calculation. After each calibration test, 24 FBG strain sensors and 6 FBG temperature compensation sensors are installed on the undersurface of box girder of Diao shui yan bridge in Yongtaiwen highway. The strain sensors demonstrate excellent measurement capability in a series of load tests. Strain responses of the strain sensors under three static working conditions and three dynamic working conditions are obtained effectively and plotted clearly, which demonstrate a more extensive application promising.


Yang M.,Wuhan University of Technology | Yang M.,Key Laboratory of Fiber Optic Sensing Technology and Information Processing | Li Z.,Wuhan University of Technology | Dai J.,Wuhan University of Technology | And 3 more authors.
Measurement Science and Technology | Year: 2013

Pd-based thin films and sol-gel WO3 coatings are two kinds of hydrogen sensitive elements used in hydrogen concentration sensing and detection. Optical fiber hydrogen sensors are very promising solutions for flammable hydrogen detection, when the sensitive materials are integrated with optical fiber sensors. This paper reviews the sensing performance of optical fiber hydrogen sensors with these two sensitive materials, which are developed at the National Engineering Laboratory for Optical Fiber Sensing Technologies in Wuhan University of Technology. © 2013 IOP Publishing Ltd.

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