The Experts below are selected from a list of 12951 Experts worldwide ranked by ideXlab platform
Orlando Frazão - One of the best experts on this subject based on the ideXlab platform.
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Temperature and strain independent torsion sensor using a Sagnac interferometer based on a suspended twin-Core Fibre
Fourth European Workshop on Optical Fibre Sensors, 2010Co-Authors: Ricardo M. Silva, Kay Schuster, Jens Kobelke, Orlando FrazãoAbstract:In this work, it is presented a Sagnac interferometric configuration based on a suspended twin-Core Fibre for sensing applications. Using the suspended twin-Core Fibre, the fringe pattern is due to the differential optical path of the light in the two Cores associated with a refractive index difference of ~10-3, which indicates an advantage of this approach compared with those based on Hi-Bi Fibres, namely the possibility to use a small length of suspended twin-Core Fibre. The sensing configuration was characterized for torsion, temperature and strain. Using the Fast Fourier Transform technique it is possible to obtain the measurand induced amplitude variations of the fringe pattern. The results obtained indicate the viability of a temperature and strain independent torsion sensor.
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Sagnac interferometer based on a suspended twin-Core Fibre
Photonic Crystal Fibers IV, 2010Co-Authors: Orlando Frazão, José Baptista, Jose Luis Santos, Jens Kobelke, Kay SchusterAbstract:ABSTRACT In this work, the authors present an alternative Sagnac interferometer based on a suspended twin-Core Fibre. Using the suspended twin-Core Fibre, the pattern fringe is due to the diffe rent optical paths of the light in the two Cores. In this case , the value of the refractive index difference between the two Cores is ~10 -3 , which indicates an advantage of this approach, namely the possibility to use a small length of the suspended twin-Core Fibre. The sensing configuration was characterized for strain, temperature, curvature and torsion, respectively. Keywords: Sagnac interferometer, suspended co re Fibre, physical parameters. 1. INTRODUCTION An all-Fibre Sagnac interferometer can be implemented in different configura tions. The traditional Sagnac interferometer has been used as gyroscopes, hydrophones, geophones and current measuring systems [1]. The other type of Sagnac interferometer is when the loop contains a section of a high bi refringent (Hi-Bi) Fibre. In this case, the pattern fringe is controlled by the length and by the birefringence of the Hi-Bi Fibre [2]. In optical sensing, besides the gyroscope application, it has been used in strain [3], temperature [4], liquid level [5] and displacement [6] sensing as well as a spectral filter for Fibre Bragg gratings demodulation [7]. Moreover, the Hi-Bi fi bre loop mirror combined with a Bragg grating [8] or with a long period grating [9] was also demonstrated for simultaneous measurement of strain and temperature. The first demonstration of the suspended Core Fibre was proposed and published in 2001 [10]. The Core with 1 P m was single-mode and it was predicted to have 17% of the mode located in the air at 1550 nm. This high degree of overlap between the fundamental mode and the holes suggests that this Fibre was suitable as evanescent field device sensor. Several authors have studied this novel geometry for gas sensing and biosensing [11]. Due to its geometry, this type of Fibre presents high birefringence and was also demonstrated in a Sagnac interferometer when a suspended Core Fibre section with three holes was spliced inside the loop [12]. In this work, the authors pres ent a suspended twin-Core Fibre in a Sagnac interferometer. Due to the geometry design, the refractive index difference between the two Cores is high and it is possible to use a small section (few centimetres) as an element sensing device.
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Fabry-Perot cavity sensing structure based on a suspended-Core Fibre
20th International Conference on Optical Fibre Sensors, 2009Co-Authors: Orlando Frazão, José Baptista, Jose Luis Santos, Jens Kobelke, Kay SchusterAbstract:A Fibre optic Fabry-Perot sensing structure based on suspended-Core Fibre is presented. The interferometric structure is formed when a small length of suspended-Core Fibre with three or four holes is spliced to the end of a standard single mode Fibre. The sensing structure is implemented firstly for strain and temperature measurement, and secondly for refractive index measurement. The interrogation of the sensing structure is obtained for the first implementation by the wavelength variation, and for the second implementation through the fringe visibility and through the analysis of the fast Fourier transform.
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Refractive index tip sensor based on Fabry-Pérot cavities formed by a suspended Core Fibre
Journal of the European Optical Society: Rapid Publications, 2009Co-Authors: Orlando Frazão, José Baptista, Jens Kobelke, J. L. Santos, Kay SchusterAbstract:A Fabry-Perot refractometer based on suspended Core Fibre is presented. The Fabry-Perot cavities are formed by a section of suspended Core Fibre between conventional single-mode Fibres. This miniature refractive tip sensor is demonstrated for the measurement of the refractive index change by measuring the fringe visibility and through the analysis of the fast Fourier transform. The two methods are compared. The temperature dependence was also characterized.
Kay Schuster - One of the best experts on this subject based on the ideXlab platform.
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Temperature and strain independent torsion sensor using a Sagnac interferometer based on a suspended twin-Core Fibre
Fourth European Workshop on Optical Fibre Sensors, 2010Co-Authors: Ricardo M. Silva, Kay Schuster, Jens Kobelke, Orlando FrazãoAbstract:In this work, it is presented a Sagnac interferometric configuration based on a suspended twin-Core Fibre for sensing applications. Using the suspended twin-Core Fibre, the fringe pattern is due to the differential optical path of the light in the two Cores associated with a refractive index difference of ~10-3, which indicates an advantage of this approach compared with those based on Hi-Bi Fibres, namely the possibility to use a small length of suspended twin-Core Fibre. The sensing configuration was characterized for torsion, temperature and strain. Using the Fast Fourier Transform technique it is possible to obtain the measurand induced amplitude variations of the fringe pattern. The results obtained indicate the viability of a temperature and strain independent torsion sensor.
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Sagnac interferometer based on a suspended twin-Core Fibre
Photonic Crystal Fibers IV, 2010Co-Authors: Orlando Frazão, José Baptista, Jose Luis Santos, Jens Kobelke, Kay SchusterAbstract:ABSTRACT In this work, the authors present an alternative Sagnac interferometer based on a suspended twin-Core Fibre. Using the suspended twin-Core Fibre, the pattern fringe is due to the diffe rent optical paths of the light in the two Cores. In this case , the value of the refractive index difference between the two Cores is ~10 -3 , which indicates an advantage of this approach, namely the possibility to use a small length of the suspended twin-Core Fibre. The sensing configuration was characterized for strain, temperature, curvature and torsion, respectively. Keywords: Sagnac interferometer, suspended co re Fibre, physical parameters. 1. INTRODUCTION An all-Fibre Sagnac interferometer can be implemented in different configura tions. The traditional Sagnac interferometer has been used as gyroscopes, hydrophones, geophones and current measuring systems [1]. The other type of Sagnac interferometer is when the loop contains a section of a high bi refringent (Hi-Bi) Fibre. In this case, the pattern fringe is controlled by the length and by the birefringence of the Hi-Bi Fibre [2]. In optical sensing, besides the gyroscope application, it has been used in strain [3], temperature [4], liquid level [5] and displacement [6] sensing as well as a spectral filter for Fibre Bragg gratings demodulation [7]. Moreover, the Hi-Bi fi bre loop mirror combined with a Bragg grating [8] or with a long period grating [9] was also demonstrated for simultaneous measurement of strain and temperature. The first demonstration of the suspended Core Fibre was proposed and published in 2001 [10]. The Core with 1 P m was single-mode and it was predicted to have 17% of the mode located in the air at 1550 nm. This high degree of overlap between the fundamental mode and the holes suggests that this Fibre was suitable as evanescent field device sensor. Several authors have studied this novel geometry for gas sensing and biosensing [11]. Due to its geometry, this type of Fibre presents high birefringence and was also demonstrated in a Sagnac interferometer when a suspended Core Fibre section with three holes was spliced inside the loop [12]. In this work, the authors pres ent a suspended twin-Core Fibre in a Sagnac interferometer. Due to the geometry design, the refractive index difference between the two Cores is high and it is possible to use a small section (few centimetres) as an element sensing device.
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Fabry-Perot cavity sensing structure based on a suspended-Core Fibre
20th International Conference on Optical Fibre Sensors, 2009Co-Authors: Orlando Frazão, José Baptista, Jose Luis Santos, Jens Kobelke, Kay SchusterAbstract:A Fibre optic Fabry-Perot sensing structure based on suspended-Core Fibre is presented. The interferometric structure is formed when a small length of suspended-Core Fibre with three or four holes is spliced to the end of a standard single mode Fibre. The sensing structure is implemented firstly for strain and temperature measurement, and secondly for refractive index measurement. The interrogation of the sensing structure is obtained for the first implementation by the wavelength variation, and for the second implementation through the fringe visibility and through the analysis of the fast Fourier transform.
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Refractive index tip sensor based on Fabry-Pérot cavities formed by a suspended Core Fibre
Journal of the European Optical Society: Rapid Publications, 2009Co-Authors: Orlando Frazão, José Baptista, Jens Kobelke, J. L. Santos, Kay SchusterAbstract:A Fabry-Perot refractometer based on suspended Core Fibre is presented. The Fabry-Perot cavities are formed by a section of suspended Core Fibre between conventional single-mode Fibres. This miniature refractive tip sensor is demonstrated for the measurement of the refractive index change by measuring the fringe visibility and through the analysis of the fast Fourier transform. The two methods are compared. The temperature dependence was also characterized.
Axel Schulzgen - One of the best experts on this subject based on the ideXlab platform.
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bright high repetition rate water window soft x ray source enabled by nonlinear pulse self compression in antiresonant hollow Core Fibre
arXiv: Optics, 2020Co-Authors: Martin Gebhardt, Tobias Heuermann, R Klas, Chang Liu, A Kirsche, M Lenski, Z Wang, Christian Gaida, J E Antoniolopez, Axel SchulzgenAbstract:Bright, coherent soft X-ray (SXR) radiation is essential to a variety of applications in fundamental research and life sciences. So far, high photon flux in this spectral region can only be delivered by synchrotrons, free electron lasers or high-order harmonic generation (HHG) sources, which are driven by kHz-class repetition rate lasers with very high peak powers. Here, we establish a novel route toward powerful and easy-to-use SXR sources by presenting a compact experiment, in which nonlinear pulse self-compression to the few-cycle regime is combined with phase-matched HHG in a single, helium-filled antiresonant hollow-Core Fibre (ARHCF). This enables the first 100 kHz-class repetition rate, table-top SXR source, that delivers an application-relevant flux of 2.8*10^6 Photons/s/eV around 300 eV. The Fibre-integration of temporal pulse self-compression (leading to the formation of the necessary strong-field waveforms) and pressure controlled phase-matching will allow compact, high repetition rate laser technology, including commercially available systems, to drive simple and cost-effective, coherent high-flux SXR sources.
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High-performance vector bending and orientation distinguishing curvature sensor based on asymmetric coupled multi-Core Fibre.
Scientific reports, 2020Co-Authors: Oskar Arrizabalaga, Axel Schulzgen, Qi Sun, Martynas Beresna, Timothy Lee, Joseba Zubia, Javier Velasco Pascual, Idurre Sáez De Ocáriz, Jose Enrique Antonio-lopez, Rodrigo Amezcua-correaAbstract:Fibre optic technology is rapidly evolving, driven mainly by telecommunication and sensing applications. Excellent reliability of the manufacturing processes and low cost have drawn ever increasing attention to Fibre-based sensors, e.g. for studying mechanical response/limitations of aerospace composite structures. Here, a vector bending and orientation distinguishing curvature sensor, based on asymmetric coupled multi-Core Fibre, is proposed and experimentally demonstrated. By optimising the mode coupling effect of a seven Core multi-Core Fibre, we have achieved a sensitivity of - 1.4 nm/° as a vector bending sensor and - 17.5 nm/m-1 as a curvature sensor. These are the highest sensitivities reported so far, to the best of our knowledge. In addition, our sensor offers several advantages such as repeatability of fabrication, wide operating range and small size and weight which benefit its sensing applications.
Rodrigo Amezcua-correa - One of the best experts on this subject based on the ideXlab platform.
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High-performance vector bending and orientation distinguishing curvature sensor based on asymmetric coupled multi-Core Fibre.
Scientific reports, 2020Co-Authors: Oskar Arrizabalaga, Axel Schulzgen, Qi Sun, Martynas Beresna, Timothy Lee, Joseba Zubia, Javier Velasco Pascual, Idurre Sáez De Ocáriz, Jose Enrique Antonio-lopez, Rodrigo Amezcua-correaAbstract:Fibre optic technology is rapidly evolving, driven mainly by telecommunication and sensing applications. Excellent reliability of the manufacturing processes and low cost have drawn ever increasing attention to Fibre-based sensors, e.g. for studying mechanical response/limitations of aerospace composite structures. Here, a vector bending and orientation distinguishing curvature sensor, based on asymmetric coupled multi-Core Fibre, is proposed and experimentally demonstrated. By optimising the mode coupling effect of a seven Core multi-Core Fibre, we have achieved a sensitivity of - 1.4 nm/° as a vector bending sensor and - 17.5 nm/m-1 as a curvature sensor. These are the highest sensitivities reported so far, to the best of our knowledge. In addition, our sensor offers several advantages such as repeatability of fabrication, wide operating range and small size and weight which benefit its sensing applications.
Jens Kobelke - One of the best experts on this subject based on the ideXlab platform.
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Temperature and strain independent torsion sensor using a Sagnac interferometer based on a suspended twin-Core Fibre
Fourth European Workshop on Optical Fibre Sensors, 2010Co-Authors: Ricardo M. Silva, Kay Schuster, Jens Kobelke, Orlando FrazãoAbstract:In this work, it is presented a Sagnac interferometric configuration based on a suspended twin-Core Fibre for sensing applications. Using the suspended twin-Core Fibre, the fringe pattern is due to the differential optical path of the light in the two Cores associated with a refractive index difference of ~10-3, which indicates an advantage of this approach compared with those based on Hi-Bi Fibres, namely the possibility to use a small length of suspended twin-Core Fibre. The sensing configuration was characterized for torsion, temperature and strain. Using the Fast Fourier Transform technique it is possible to obtain the measurand induced amplitude variations of the fringe pattern. The results obtained indicate the viability of a temperature and strain independent torsion sensor.
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Sagnac interferometer based on a suspended twin-Core Fibre
Photonic Crystal Fibers IV, 2010Co-Authors: Orlando Frazão, José Baptista, Jose Luis Santos, Jens Kobelke, Kay SchusterAbstract:ABSTRACT In this work, the authors present an alternative Sagnac interferometer based on a suspended twin-Core Fibre. Using the suspended twin-Core Fibre, the pattern fringe is due to the diffe rent optical paths of the light in the two Cores. In this case , the value of the refractive index difference between the two Cores is ~10 -3 , which indicates an advantage of this approach, namely the possibility to use a small length of the suspended twin-Core Fibre. The sensing configuration was characterized for strain, temperature, curvature and torsion, respectively. Keywords: Sagnac interferometer, suspended co re Fibre, physical parameters. 1. INTRODUCTION An all-Fibre Sagnac interferometer can be implemented in different configura tions. The traditional Sagnac interferometer has been used as gyroscopes, hydrophones, geophones and current measuring systems [1]. The other type of Sagnac interferometer is when the loop contains a section of a high bi refringent (Hi-Bi) Fibre. In this case, the pattern fringe is controlled by the length and by the birefringence of the Hi-Bi Fibre [2]. In optical sensing, besides the gyroscope application, it has been used in strain [3], temperature [4], liquid level [5] and displacement [6] sensing as well as a spectral filter for Fibre Bragg gratings demodulation [7]. Moreover, the Hi-Bi fi bre loop mirror combined with a Bragg grating [8] or with a long period grating [9] was also demonstrated for simultaneous measurement of strain and temperature. The first demonstration of the suspended Core Fibre was proposed and published in 2001 [10]. The Core with 1 P m was single-mode and it was predicted to have 17% of the mode located in the air at 1550 nm. This high degree of overlap between the fundamental mode and the holes suggests that this Fibre was suitable as evanescent field device sensor. Several authors have studied this novel geometry for gas sensing and biosensing [11]. Due to its geometry, this type of Fibre presents high birefringence and was also demonstrated in a Sagnac interferometer when a suspended Core Fibre section with three holes was spliced inside the loop [12]. In this work, the authors pres ent a suspended twin-Core Fibre in a Sagnac interferometer. Due to the geometry design, the refractive index difference between the two Cores is high and it is possible to use a small section (few centimetres) as an element sensing device.
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Fabry-Perot cavity sensing structure based on a suspended-Core Fibre
20th International Conference on Optical Fibre Sensors, 2009Co-Authors: Orlando Frazão, José Baptista, Jose Luis Santos, Jens Kobelke, Kay SchusterAbstract:A Fibre optic Fabry-Perot sensing structure based on suspended-Core Fibre is presented. The interferometric structure is formed when a small length of suspended-Core Fibre with three or four holes is spliced to the end of a standard single mode Fibre. The sensing structure is implemented firstly for strain and temperature measurement, and secondly for refractive index measurement. The interrogation of the sensing structure is obtained for the first implementation by the wavelength variation, and for the second implementation through the fringe visibility and through the analysis of the fast Fourier transform.
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Refractive index tip sensor based on Fabry-Pérot cavities formed by a suspended Core Fibre
Journal of the European Optical Society: Rapid Publications, 2009Co-Authors: Orlando Frazão, José Baptista, Jens Kobelke, J. L. Santos, Kay SchusterAbstract:A Fabry-Perot refractometer based on suspended Core Fibre is presented. The Fabry-Perot cavities are formed by a section of suspended Core Fibre between conventional single-mode Fibres. This miniature refractive tip sensor is demonstrated for the measurement of the refractive index change by measuring the fringe visibility and through the analysis of the fast Fourier transform. The two methods are compared. The temperature dependence was also characterized.
