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Xu X.,Shenzhen Key Laboratory of Sensor Technology | Xu X.,ShenZhen Engineering Laboratory for Optical Fiber Sensors and Networks | Xu X.,Shenzhen University | Li X.,Shenzhen Key Laboratory of Sensor Technology | And 12 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The subway is a representative form of the rail transit, and its catenary suspension system is a very important aspect to the safety of the whole system. The safety monitoring of the subway catenary suspension system is studied in this paper. A demonstrate model is set up in the laboratory, and some fiber Bragg grating (FBG) sensors including strain sensors and displacement sensors were utilized in the demonstrate system. It is shown that the used sensors could indicate the safety information of the system effectively. Especially, the designed displacement sensor that is packaged by athermal technique can abandon the influence of the environment temperature in a certain degree. Its engineering applicability is greatly improved. © 2013 SPIE.


Chen Y.,Shenzhen University | Chen Y.,Shenzhen Key Laboratory of Sensor Technology | Chen Y.,Shenzhen Engineering Laboratory for Optical Fiber Sensors and Networks | Li X.,Shenzhen University | And 11 more authors.
Journal of Physics D: Applied Physics | Year: 2016

A liquid-core fiber optic surface plasmon resonance sensor with an adjustable nano-porous silica coating is first presented in this paper. By adjusting the refractive index of the nano-porous silica coating, the sensor can be used in different refractive index detection ranges. A low refractive index interval of 1.33-1.34 and a high refractive index interval of 1.42-1.44 are taken as examples to be investigated. Results show that our sensor works well in these two intervals by using appropriate nano-porous silica coatings. The highest sensitivities of the low and high refractive index intervals are obtained to be 5840 nm/RIU and 5120 nm/RIU, respectively. In addition, the sensing performances and the working wavelengths can be adjusted to meet different working requirements by changing the refractive index of the nano-porous silica coating. We also take the single mode incidence cases to explain the effects of different single incident light modes on the sensing performances. © 2016 IOP Publishing Ltd.


Yu Y.,Shenzhen University | Yu Y.,ShenZhen Engineering Laboratory for Optical Fiber Sensors and Networks | Huang Q.,Shenzhen University | Li X.,Shenzhen University | And 3 more authors.
Sensing and Bio-Sensing Research | Year: 2014

A novel and simple sensor based on fiber-optic modal interferometer fabricated by a segment of low elliptical hollow-core photonic bandgap fiber for simultaneous temperature and twist measurements is demonstrated. Meanwhile the sensor can also measure the twist angle and determine the twist direction simultaneously. The mode distribution of EHC-PBGF is demonstrated both in theory and experiments. There is an obvious difference of two transmission dips on the temperature and twist. The twist sensitivities of Dip 1 and Dip 2 are obtained to be -31.95 and -585.8. pm/(rad/m), respectively. The temperature sensitivities are 12.99. pm/°C for Dip 1 and 5.09. pm/°C for Dip 2, respectively. Two parameters of twist and temperature can be distinguished and measured simultaneously by using a sensing matrix. Meanwhile the structure is found to be weakly sensitive to the axial strain. It has the advantage of avoiding the crosstalk of strain in the applications. © 2014 The Authors.


Chen Y.,Shenzhen University | Chen Y.,Shenzhen Key Laboratory of Sensor Technology | Chen Y.,Shenzhen Engineering Laboratory for Optical Fiber Sensors and Networks | Yu Y.,Shenzhen Key Laboratory of Sensor Technology | And 10 more authors.
Plasmonics | Year: 2015

Fiber-optic surface plasmon resonance sensors with multi metal layers (Ti/Ag/Au) and single silver or gold layer are presented. In comparison with widely used single-layer sensors, the multi-layer sensor shows a wider refractive index measurement range (in a range of 1.3344 to 1.4111 RIU) and a better resolution in the high refractive index region (refractive index over 1.3697 RIU). In addition, the sensitivity of multi-layer sensor is between those of sensors with silver and gold layers, the chemical stability, and the film adhesion capability of multi-layer sensor are much better than those of silver layer sensor. © 2015, Springer Science+Business Media New York.


Tan Z.,Shenzhen Key Laboratory of Sensor Technology | Tan Z.,Shenzhen Engineering Laboratory for Optical Fiber Sensors and Networks | Tan Z.,Shenzhen University | Li X.,Shenzhen Key Laboratory of Sensor Technology | And 6 more authors.
Plasmonics | Year: 2014

Inspired by the classic theory, we suggest that the performance of a D-shaped fiber optical surface plasmon resonance (SPR) sensor can be improved by manipulating the fiber core mode. To demonstrate this, we propose a novel fiber SPR sensor based on a hollow core photonic crystal fiber with liquid mixture filled in the core. The fiber sensor design involves a side-polished fiber with gold film deposited on the polished plane and liquid filling. Numerical simulation results suggest that by tuning the refractive index of the liquid mixture, the predicted sensitivity will be over 6,430 nm/refractive index unit for an aqueous environment, which is competitive for fiber chemical sensing. This optimization method may lead to an ultrahigh sensitivityfiber optical biosensor. © 2013 Springer Science+Business Media New York.


Chen Y.,Shenzhen University | Chen Y.,Shenzhen Key Laboratory of Sensor Technology | Chen Y.,Shenzhen Engineering Laboratory for Optical Fiber Sensors and Networks | Yu Y.,Shenzhen Key Laboratory of Sensor Technology | And 14 more authors.
Sensors and Actuators, B: Chemical | Year: 2016

A fiber-optic urine specific gravity sensor based on surface plasmon resonance is first presented in this paper. We have proposed a novel side coated Au film fiber-optic surface plasmon resonance sensor, which is much easier to fabricate than other fiber-optic surface plasmon resonance sensors, for urine specific gravity detection. We made a sensor with 48-nm thickness of sensing layer and 15-mm length of sensing region. The experimental results are satisfactory. In the urine specific gravity detection, we use wavelength and intensity modulations to extract sensing information and their detection results show good linearities. The urine specific gravity sensitivities in glycosuria detection are obtained to be 856.09 nm/SG (in wavelength modulation) and 183.31%/SG (in intensity modulation), respectively. While they are ultra-high in albuminuria detection, the wavelength sensitivity is 12,645 nm/SG and the intensity sensitivity is 1410%/SG. © 2015 Elsevier B.V. All rights reserved.


Chen Y.,Shenzhen University | Chen Y.,Shenzhen Key Laboratory of Sensor Technology | Chen Y.,Shenzhen Engineering Laboratory for Optical Fiber Sensors and Networks | Li X.,Shenzhen University | And 14 more authors.
Plasmonics | Year: 2016

There are two important factors, which are easily neglected, restricting the sensing performance of fiber-optic surface plasmon resonance (SPR) sensors. These are the selection of incident light modes and the uneven distribution of the sensing layer. In this paper, a fiber-optic SPR sensor model with a non-uniform sensing layer is first proposed. We use fiber-optic SPR sensor models with uniform and non-uniform sensing layers to study the impact of incident light modes and sensing layer non-uniformities on their sensing performances, respectively. In the case of a uniform sensing layer, the contributions of different single incident light modes are investigated and the optimal incident multimode form is selected as 1.41 ~ π/2; the optimal thickness of the sensing layer is selected as 65 nm. In the case of a non-uniform sensing layer, the non-uniformity of the sensing layer has little effect on the sensing performances when the length of the sensing region is 10 mm. However, the length of the sensing region has an obvious effect on the sensing performances. © 2016 Springer Science+Business Media New York

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