Fiber Bragg Gratings for Strain Sensing in High Temperature Superconducting Magnet

Wang, Q.; Deng, Fanping; Huang, Guojun; Yan, Luguang; Dai, Yinming

doi:10.1109/tasc.2007.899078

Cited by 25 publications

(6 citation statements)

References 4 publications

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“…structural strain sensing [1], pressure sensing [2], acceleration [3] and biochemical sensing [4]. While all-optical sensors can be amplitude [5], frequency [6], polarization [7] or phase modulated [8] the all-optical sensor types most often encountered in literature within strain, pressure and force sensing are the amplitude and frequency modulated sensors. Amplitude modulated sensors usually have a very high sensitivity at the cost of increased transmission noise sensitivity and maximum one sensor per communication line.…”

Section: Introductionmentioning

confidence: 99%

MEMS Bragg grating force sensor

Reck¹,

Thomsen²,

Hansen³

2011

Opt. Express

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We present modeling, design, fabrication and characterization of a new type of all-optical frequency modulated MEMS force sensor based on a mechanically amplified double clamped waveguide beam structure with integrated Bragg grating. The sensor is ideally suited for force measurements in harsh environments and for remote and distributed sensing and has a measured sensitivity of -14 nm/N, which is several times higher than what is obtained in conventional fiber Bragg grating force sensors.

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Section: Introductionmentioning

confidence: 99%

MEMS Bragg grating force sensor

Reck¹,

Thomsen²,

Hansen³

2011

Opt. Express

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“…Strain and temperature changes are not distinguishable within the Rayleigh scatter spectra, and what is measured is usually a combined effect. The relationship between a frequency shift ν obtained from a cross correlation and the temperature change T and strain ε is [16,21]:…”

Section: Non Steady State Operation Issuesmentioning

confidence: 99%

“…The potential use of a FOS to monitor the strain state and the onset of quenches in Nb 3 Sn magnets has been studied intermittently for about 20 years [12][13][14][15][16][17][18][19][20]. Mach-Zehnder interferometry was used to sense a change in the optical path length of the fiber with respect to a reference fiber.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal resolution requirements for quench detection in (RE)Ba₂Cu₃O_xmagnets using Rayleigh-scattering-based fiber optic distributed sensing

Chan

Flanagan

Schwartz

2013

Supercond. Sci. Technol.

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One of the key remaining challenges to safe and reliable operation of large, high temperature superconductor (HTS)-based magnet systems is quench detection and protection. Due to the slow quench propagation in HTS systems, the conventional discrete voltage-tap approach developed for NbTi and Nb 3 Sn magnets may not be sufficient. In contrast, a distributed temperature profile, generated by a distributed temperature sensor and facilitating continuous monitoring of the temperature at any monitored locations within a magnet with high spatial resolution, may be required. One such distributed temperature sensing option is the use of Rayleigh-based fiber optic sensors (FOS), which are immune to electromagnetic interference. The detection of a quench via Rayleigh-based FOS relies on converting the spectral shifts in the Rayleigh scattering spectra into temperature variations. As a result, the higher the spatial sampling resolution the larger the data processing volume, and thus the lower the temporal sampling resolution. So, for effective quench detection, which requires the quick and accurate identification of a hot spot, it is important to find a balance between the spatial and temporal resolutions executable on a given data acquisition and processing (DAQ) system. This paper discusses a method for finding an appropriate DAQ technology that matches the characteristic of a superconducting coil, and determining the acceptable resolutions for efficient and safe quench detection. A quench detection algorithm based on distributed temperature sensing is proposed and its implementation challenges are discussed.

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“…Enhancing the temperature sensitivity of a FBG is very much significant not only for temperature sensing but also for the ever expanding use of FBGs in sensing applications [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the temperature sensitivity of fiber Bragg grating sensor using bimetallic strip

et al. 2012

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This paper presents theoretical and experimental results carried out on a simple structure based on bimetallic cantilever to enhance temperature sensitivity of fiber Bragg grating (FBG) sensors. Two metals of equal length and width but having different coefficients of thermal expansion (CTE) are bonded with electric arc welding to form the bimetallic strip and FBG was longitudinally affixed to that metallic strip having larger coefficient of thermal expansion. It was observed that the temperature sensitivity of the proposed FBG sensor has increased 5 times more compared to the bare FBG sensor. Moreover, the proposed sensor showed excellent linearity, reversibility, and repeatability.

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Fiber Bragg Gratings for Strain Sensing in High Temperature Superconducting Magnet

Abstract: Abstract-Fiber

Cited by 25 publications

References 4 publications

MEMS Bragg grating force sensor

MEMS Bragg grating force sensor

Spatial and temporal resolution requirements for quench detection in (RE)Ba₂Cu₃O_xmagnets using Rayleigh-scattering-based fiber optic distributed sensing

Enhancing the temperature sensitivity of fiber Bragg grating sensor using bimetallic strip

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Fiber Bragg Gratings for Strain Sensing in High Temperature Superconducting Magnet

Abstract: Abstract-Fiber

Cited by 25 publications

References 4 publications

MEMS Bragg grating force sensor

MEMS Bragg grating force sensor

Spatial and temporal resolution requirements for quench detection in (RE)Ba2Cu3Oxmagnets using Rayleigh-scattering-based fiber optic distributed sensing

Enhancing the temperature sensitivity of fiber Bragg grating sensor using bimetallic strip

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Spatial and temporal resolution requirements for quench detection in (RE)Ba₂Cu₃O_xmagnets using Rayleigh-scattering-based fiber optic distributed sensing