Enhanced FBG strain sensing multiplexing capacity using combination of intensity and wavelength dual-coding technique

Zhang, L.; Liu, Y.; Williams, J.A.R.; Bennion, I.

doi:10.1109/68.806872

Cited by 44 publications

(32 citation statements)

References 5 publications

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“…Bandwidth on the order of 44% can be achieved [5]. The slot-coupled microstrip antenna with a triplate line feed has been achieved [6]. Recently, a T-shaped microstripfed single-layer single-slot antenna [7] with an impedance bandwidth of 45% has been also presented.…”

Section: Introductionmentioning

confidence: 97%

“…It is demostrated that through the combination of these conventional techniques, the bandwidth and the cross-polarization level can be improved substantially just like in conventional microstrip patches. The proposed aperture-coupled antenna has simillar radiation patterns but larger impedance bandwidth (84.9%) than microstrip designs utilizing aperture-coupled stacked patches [3][4][5] and other aperturecoupled patch antennas [2,6], which seldom exceeds 50% for the microstrip-fed case. Experimental results for the broadband performance and the radiation pattern are also presented.…”

Section: Introductionmentioning

confidence: 97%

“…The FBG sensors have attracted considerable attention in recent years because of their ease in handling, low cost, small size, and inherent advantages incorporated with fiber communication systems [2][3][4][5][6]. By detecting the Bragg wavelength shift, the FBG sensors can measure many physical quantities, such as strain, temperature, and pressure.…”

Section: Introductionmentioning

confidence: 99%

“…By detecting the Bragg wavelength shift, the FBG sensors can measure many physical quantities, such as strain, temperature, and pressure. Several configurations of the FBG sensors launch broadband sources into the FBGs to reflect light with sensing information from the Bragg wavelength shift [3][4][5][6]. The conventional grating spectrometer and the scanning fiber Fabry-Perot filter can interrogate the Bragg wavelength shift.…”

Section: Introductionmentioning

confidence: 99%

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High‐resolution fiber Bragg grating sensor system using linear‐cavity fiber laser scheme

Peng

Tseng

Chi

2002

Micro & Optical Tech Letters

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ABSTRACT:A high-resolution fiber Bragg grating (FBG) sensor system using a linear-cavity fiber laser scheme is proposed and numerically studied. The proposed sensor system can improve the sensing accuracy by using a discriminating FBG pair in conjunction with a fiber laser scheme. This FBG sensor system can resolve the temperature up to 0.0005°C theoretically and can be applied for strain sensing and temperature sensing with high precision.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐resolution fiber Bragg grating sensor system using linear‐cavity fiber laser scheme

Peng

Tseng

Chi

2002

Micro & Optical Tech Letters

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“…This concept is also applicable to fiber sensing in general 8 , and FBG sensing in particular 9,10 . Many WDM or DWMD components and modules developed for optical communications purposes can be directly used for sensing as well.…”

Section: Principle Of Operationmentioning

confidence: 99%

Multichannel FBG sensing system using a dense wavelength division demultiplexing module

et al. 2005

SPIE Proceedings

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. (2005). Multi-channel FBG sensing system using a dense wavelength division demultiplexing module. In Y. Rao, O. Kwon & G. Peng (Eds.), SPIE Advanced Sensor Systems and Applications (pp. 211-218). USA: The Society of Photo-Optical Instrumentation Engineers.Multi-channel FBG sensing system using a dense wavelength division demultiplexing module AbstractFiber Bragg grating (FBG) sensing is gaining attention in both scientific research areas and engineering applications thanks to its distinguishing advantages including wavelength multiplexing capability, miniature size, high sensitivity, immunity from electro-magnetic interference, etc. FBG sensing is based on the detection of the shifted Bragg wavelength of the light reflected by a fiber grating which is sensitive to various physical parameters such as strain and temperature. One of the challenging tasks in FBG sensing is to determine the Bragg wavelength shift, which can be done by using an optical spectrum analyzer (OSA). An OSA is suitable for laboratory tests, but not an ideal solution for field applications in term of cost and convenience. Different wavelength demodulation methods have been developed for FBG sensing purpose. One of them is employing a bulk linear edge filter to convert the wavelength shifts to intensity variations. This method offers several obvious advantages including low cost and ability for dynamic measurements. However, most of the edgefilter based FBG sensing systems are designed for single-channel measurement. In this study, we propose and develop a multi-channel FBG sensing system based on the edge-filtering technique. In order to demodulate multi-channel signal from FBG sensors, we propose to use a dense wavelength division multiplexing (DWDM) module. The light signals coming from wavelength-multiplexed FBG sensors are demultiplexed into individual channels and demodulated by the pass-band edges. In the present study, a four-channel FBG sensing system has been demonstrated. Disciplines Physical Sciences and Mathematics Publication DetailsLi, E., Xi, J., Yu, Y., Chicharo, J. Fiber Bragg grating (FBG) sensing is gaining attention in both scientific research areas and engineering applications thanks to its distinguishing advantages including wavelength multiplexing capability, miniature size, high sensitivity, immunity from electro-magnetic interference, etc. FBG sensing is based on the detection of the shifted Bragg wavelength of the light reflected by a fiber grating which is sensitive to various physical parameters such as strain and temperature. One of the challenging tasks in FBG sensing is to determine the Bragg wavelength shift, which can be done by using an optical spectrum analyzer (OSA). An OSA is suitable for laboratory tests, but not an ideal solution for field applications in term of cost and convenience. Different wavelength demodulation methods have been developed for FBG sensing purpose. One of them is employing a bulk linear edge filter to convert the wavelength shifts to intensity variations. This method offers sever...

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Fiber‐ring laser‐based fiber grating sensor system using self‐healing ring architecture

Peng¹,

Tseng²,

Chi³

2002

Micro & Optical Tech Letters

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eventually grow higher if we continue increasing kR and move beyond any validity of the RG approximation (as in Figure 2). It is inferred from Figure 4 that bipolar droplets also show a similar error variation, with higher errors encountered closer to kR ϭ 0.5 and an error null close to kR ϭ 4. On the other hand, aligned droplets more closely resemble the isotropic sphere case and manifest a weak oscillatory behaviour in their average error. The stronger error found in radial and bipolar droplets might be attributed to their inhomogeneous structure (Ѩ /Ѩr 0) as opposed to the aligned anisotropic or isotropic spherical counterparts. CONCLUSIONFor PDLC droplets in the range 0.5 Յ kR Յ 5 it was found that the RG method provides a correct general estimate to the variation of the differential scattering cross section for the analysed types of droplet configuration. As no analytical solution is available, the FDTD method combined with a very fine grid was used to provide an accurate numerical calculation for the differential cross section. Typical local and average errors for the RG method in the above range are usually around 10 -20%. However, higher errors have also been recorded, in particular for radial droplets where average errors of around 40% were found. A rather surprising behaviour for the error variation is noticed: error is not a monotonic increasing function for increased values of kR in the above range. It is found that in some cases the error for kR close to 0.5 is significantly higher to the error occurring when kR is close to 3 or 4, contrary to the intuitive expectation that smaller values of kR should lead to reduced errors. This unexpected error behaviour has also been observed in the particular case of radial droplets when the RG method was assessed against the DDA. FIBER-RING LASER-BASED FIBER GRATING SENSOR SYSTEM USING SELF-HEALING RING ARCHITECTURE

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Enhanced FBG strain sensing multiplexing capacity using combination of intensity and wavelength dual-coding technique

Cited by 44 publications

References 5 publications

High‐resolution fiber Bragg grating sensor system using linear‐cavity fiber laser scheme

High‐resolution fiber Bragg grating sensor system using linear‐cavity fiber laser scheme

Multichannel FBG sensing system using a dense wavelength division demultiplexing module

Fiber‐ring laser‐based fiber grating sensor system using self‐healing ring architecture

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