The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Daru Chen - One of the best experts on this subject based on the ideXlab platform.
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Hydrostatic Pressure sensor using two-core photonic crystal fiber
OFS2012 22nd International Conference on Optical Fiber Sensors, 2012Co-Authors: Zhengyong Liu, Ming-leung Vincent Tse, Daru Chen, Chao Lu, Hwa-yaw TamAbstract:A Hydrostatic Pressure sensor based on a custom made two-core photonic crystal fiber (TC-PCF) is experimentally demonstrated. The TC-PCF was fabricated in our lab using standard PCF fabrication techniques. A Hydrostatic Pressure sensor based on the in-line fiber Mach-Zehnder interference is reported. The two solid cores of the TC-PCF separated by an air hole acted as the two arms in the interferometer. The Pressure sensor has high repeatability and high sensitivity of -54.06 pm/MPa.
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Side-hole two-core microstructured optical fiber for Hydrostatic Pressure sensing
Applied Optics, 2012Co-Authors: Gufeng Hu, Daru Chen, Xiaogang JiangAbstract:A novel side-hole two-core microstructured optical fiber (STMOF) is proposed for Hydrostatic Pressure sensing. The two solid fiber cores are surrounded by a few small air holes and two large air holes, and are separated by one small air hole in the center of the cross section of the STMOF. The two large air holes that we called side holes essentially provide a built-in transducing mechanism to enhance the Pressure-induced index change, which ensures the high sensitivity of the Hydrostatic Pressure sensor based on the STMOF. Mode coupling between the two fiber cores of the STMOF has been investigated, which provides a Pressure-dependent transmission spectrum by injecting a broadband light into one fiber core of the STMOF on one side and detecting output spectrum on another fiber core on the other side. Our simulations show that there is a one-to-one correspondence between the Hydrostatic Pressure applied on the STMOF and the peak wavelength shift of the transmission spectrum. A Hydrostatic Pressure sensor based on an 8 cm STMOF has a sensitivity of 0.111 nm/Mpa for the measurement range from 0 Mpa to 200 Mpa. The performances of Hydrostatic Pressure sensors based on STMOFs with different structure parameters are presented.
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Side-Hole Dual-Core Photonic Crystal Fiber for Hydrostatic Pressure Sensing
Journal of Lightwave Technology, 2012Co-Authors: Gufeng Hu, Daru ChenAbstract:We propose a novel side-hole dual-core photonic crystal fiber (SHDC-PCF) which is used as the sensing element of the Hydrostatic Pressure sensor. There are two solid fiber cores separated by one small air hole in the triangular lattice photonic crystal structure region. Two large air holes are employed in the cross-section outside of the photonic crystal structure region, which essentially provides a built-in transducing mechanism to enhance the Pressure-induced index change for the SHDC-PCF. The mode coupling between two fiber cores of the SHDC-PCF under different Hydrostatic Pressure is numerically investigated. The SHDC-PCF based Pressure sensor is simply formed by using a segment of SHDC-PCF spliced to two single mode fibers. Our simulations show that there is a linear relationship between the Hydrostatic Pressure applied on the SHDC-PCF and the peak wavelength shift of the sensor output spectrum. A Hydrostatic Pressure sensor based on a 10-cm SHDC-PCF has shown a sensing range from 0 to 500 MPa and a sensitivity of 32 pm/MPa. The performances of Hydrostatic Pressure sensors based on SHDC-PCFs with different structure parameters are presented.
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Dual-Core Photonic Crystal Fiber for Hydrostatic Pressure Sensing
IEEE Photonics Technology Letters, 2011Co-Authors: Daru Chen, Gufeng Hu, Lingxia ChenAbstract:We propose a novel Hydrostatic Pressure sensor based on a dual-core photonic crystal fiber (DC-PCF). Two solid fiber cores separated by an air hole in the cross-section lead to two independent waveguides inside the DC-PCF which accompany with mode coupling. The mode coupling of two solid fiber cores of the DC-PCF under different Hydrostatic Pressure is numerically investigated. A Pressure sensing system is proposed and performances of the Pressure sensor have been numerically investigated. Our calculations show a Hydrostatic Pressure sensor based on a 10-cm DC-PCF has a sensing range from 0 to 1000 MPa and a sensitivity of 3.47 pm/MPa.
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Hydrostatic Pressure SENSOR BASED ON MODE INTERFERENCE OF A FEW MODE FIBER
Progress in Electromagnetics Research-pier, 2011Co-Authors: Daru Chen, Ming-leung Vincent Tse, Hwa-yaw TamAbstract:A novel Hydrostatic Pressure sensor based on a few mode flber (FMF) is proposed. The FMF-based Hydrostatic Pressure sensor is simply formed by splicing a segment of FMF to two segments of single mode flbers, where the FMF is used as the sensing element. The mode interference between LP01 mode and LP11 mode of the FMF provides an interference spectrum of the FMF-based Hydrostatic Pressure sensor which is sensitive to the Hydrostatic Pressure applied on the FMF. We experimentally show that there is a linear relationship between the Hydrostatic Pressure and the wavelength shift of the interference spectrum of the FMF-based Hydrostatic Pressure sensor.
Tadeusz Martynkien - One of the best experts on this subject based on the ideXlab platform.
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highly birefringent microstructured fibers with enhanced sensitivity to Hydrostatic Pressure
Optics Express, 2010Co-Authors: Tadeusz Martynkien, Jan Wojcik, Jacek Olszewski, Pawel Mergo, Gabriela Statkiewiczbarabach, Thomas Geernaert, Camille Sonnenfeld, Alicja Anuszkiewicz, Marcin K Szczurowski, Karol TarnowskiAbstract:We designed, manufactured and characterized two birefringent microstructured fibers that feature a 5-fold increase in polarimetric sensitivity to Hydrostatic Pressure compared to the earlier reported values for microstructured fibers. We demonstrate a good agreement between the finite element simulations and the experimental values for the polarimetric sensitivity to Pressure and to temperature. The sensitivity to Hydrostatic Pressure has a negative sign and exceeds −43 rad/MPa × m at 1.55 μm for both fibers. In combination with the very low sensitivity to temperature, this makes our fibers the candidates of choice for the development of microstructured fiber based Hydrostatic Pressure measurement systems.
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Measurements of Hydrostatic Pressure and temperature sensitivity in birefringent holey fibers
Photonic Crystal Materials and Devices III, 2006Co-Authors: Tadeusz Martynkien, Gabriela Statkiewicz, Mariusz Makara, Jan Wojcik, Jacek Olszewski, Marcin Szpulak, Waclaw Urbanczyk, Tomasz Nasilowski, Pawel Mergo, Francis BerghmansAbstract:We report on experimental studies of polarimetric sensitivity to temperature and Hydrostatic Pressure in two highly birefringent index guided photonic crystal fibers. Our results confirm earlier theoretical predictions indicating that polarimetric sensitivity to temperature in highly birefringent PCF with specific constriction can be very low. Proper choice of constructional parameters of the PCF can lead to complete temperature desensitization. On the other hand, relatively high polarimetric sensitivity to Hydrostatic Pressure in the analyzed structures make them good candidates for applications as active elements in Hydrostatic Pressure sensors.
Shinsaku Tokuda - One of the best experts on this subject based on the ideXlab platform.
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Effects of Hydrostatic Pressure on Carcinogenic Properties of Epithelia.
PLOS ONE, 2015Co-Authors: Shinsaku Tokuda, Young Hak Kim, Hisako Matsumoto, Shigeo Muro, Toyohiro Hirai, Michiaki Mishima, Mikio FuruseAbstract:The relationship between chronic inflammation and cancer is well known. The inflammation increases the permeability of blood vessels and consequently elevates Pressure in the interstitial tissues. However, there have been only a few reports on the effects of Hydrostatic Pressure on cultured cells, and the relationship between elevated Hydrostatic Pressure and cell properties related to malignant tumors is less well understood. Therefore, we investigated the effects of Hydrostatic Pressure on the cultured epithelial cells seeded on permeable filters. Surprisingly, Hydrostatic Pressure from basal to apical side induced epithelial stratification in Madin-Darby canine kidney (MDCK) I and Caco-2 cells, and cavities with microvilli and tight junctions around their surfaces were formed within the multi-layered epithelia. The Hydrostatic Pressure gradient also promoted cell proliferation, suppressed cell apoptosis, and increased transepithelial ion permeability. The inhibition of protein kinase A (PKA) promoted epithelial stratification by the Hydrostatic Pressure whereas the activation of PKA led to suppressed epithelial stratification. These results indicate the role of the Hydrostatic Pressure gradient in the regulation of various epithelial cell functions. The findings in this study may provide clues for the development of a novel strategy for the treatment of the carcinoma.
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Hydrostatic Pressure regulates tight junctions actin cytoskeleton and transcellular ion transport
Biochemical and Biophysical Research Communications, 2009Co-Authors: Shinsaku Tokuda, Ken-ichi Nakajima, Hiroaki Miyazaki, Toshiki Yamada, Yoshinori MarunakaAbstract:Abstract In the epithelia and endothelia, tight junctions regulate the movement of several substances through the paracellular pathway, maintaining several gradients between apical and basal compartments including osmolality and Hydrostatic Pressure. In this study, we show that the change of Hydrostatic Pressure gradient affected tight junctions as well as actin cytoskeleton, cell height and transcellular ion transport. Hydrostatic Pressure gradient from basolateral to apical side increased transepithelial conductance and altered claudin-1 localization within several tens of minutes. These changes were promptly restored by the elimination of Hydrostatic Pressure gradient. Hydrostatic Pressure gradient also induced dynamic changes in the actin structure and cell height. We further found that Hydrostatic Pressure gradient from basolateral to apical side stimulates transcellular Cl− transport. Our present findings indicate that the epithelial cell structures and functions are regulated by the Hydrostatic Pressure gradient which is generated and maintained by the epithelia themselves.
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Regulation of paracellular Na+ and Cl− conductances by Hydrostatic Pressure
Cell Biology International, 2009Co-Authors: Shinsaku Tokuda, Naomi Niisato, Toshiki Nagai, Akiyuki Taruno, Ken-ichi Nakajima, Hiroaki Miyazaki, Toshiki Yamada, Shigekuni Hosogi, Mariko Ohta, Kyosuke NishioAbstract:Abstract The effect of Hydrostatic Pressure on the paracellular ion conductance (Gp) composed of the Na + conductance (G Na ) and the Cl − conductance (G Cl ) has been Investigated. Gp, G Na and G Cl were time-dependently increased after applying an osmotic gradient generated by NaCl with basolateral hypotonicity. Hydrostatic Pressure (1–4 cm H 2 O) applied from the basolateral side enhanced the osmotic gradient-induced increase in Gp, G Na and G Cl in a magnitude-dependent manner, while the Hydrostatic Pressure applied from the apical side diminished the osmotic gradient-induced increase in Gp, G Na and G Cl . How the Hydrostatic Pressure influences Gp, G Na and G Cl under an isosmotic condition was also investigated. Gp, G Na and G Cl were stably constant under a condition with basolateral application of sucrose canceling the NaCl-generated osmotic gradient (an isotonic condition). Even under this stable condition, the basolaterally applied Hydrostatic Pressure drastically elevated Gp, G Na and G Cl , while apically applied Hydrostatic Pressure had little effect on Gp, G Na or G Cl . Taken together, these observations suggest that certain factors controlled by the basolateral osmolality and the basolaterally applied Hydrostatic Pressure mainly regulate the Gp, G Na and G Cl .
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Regulation of paracellular Na þ and Clconductances by Hydrostatic Pressure
2009Co-Authors: Shinsaku Tokuda, Naomi Niisato, Toshiki Nagai, Akiyuki Taruno, Ken-ichi Nakajima, Hiroaki Miyazaki, Toshiki Yamada, Shigekuni Hosogi, Mariko Ohta, Kyosuke NishioAbstract:The effect of Hydrostatic Pressure on the paracellular ion conductance (Gp) composed of the Na þ conductance (GNa) and the Clconductance (GCl) has been Investigated. Gp, GNa and GCl were time-dependently increased after applying an osmotic gradient generated by NaCl with basolateral hypotonicity. Hydrostatic Pressure (1e 4c m H2O) applied from the basolateral side enhanced the osmotic gradient-induced increase in Gp, GNa and GCl in a magnitude-dependent manner, while the Hydrostatic Pressure applied from the apical side diminished the osmotic gradient-induced increase in Gp, GNa and GCl. How the Hydrostatic Pressure influences Gp, GNa and GCl under an isosmotic condition was also investigated. Gp, GNa and GCl were stably constant under a condition with basolateral application of sucrose canceling the NaCl-generated osmotic gradient (an isotonic condition). Even under this stable condition, the basolaterally applied Hydrostatic Pressure drastically elevated Gp, GNa and GCl, while apically applied Hydrostatic Pressure had little effect on Gp, GNa or GCl. Taken together, these observations suggest that certain factors controlled by the basolateral osmolality and the basolaterally applied Hydrostatic Pressure mainly regulate the Gp, GNa and GCl. 2009 International Federation for Cell Biology. Published by Elsevier Ltd. All rights reserved.
Jan Wojcik - One of the best experts on this subject based on the ideXlab platform.
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highly birefringent microstructured fibers with enhanced sensitivity to Hydrostatic Pressure
Optics Express, 2010Co-Authors: Tadeusz Martynkien, Jan Wojcik, Jacek Olszewski, Pawel Mergo, Gabriela Statkiewiczbarabach, Thomas Geernaert, Camille Sonnenfeld, Alicja Anuszkiewicz, Marcin K Szczurowski, Karol TarnowskiAbstract:We designed, manufactured and characterized two birefringent microstructured fibers that feature a 5-fold increase in polarimetric sensitivity to Hydrostatic Pressure compared to the earlier reported values for microstructured fibers. We demonstrate a good agreement between the finite element simulations and the experimental values for the polarimetric sensitivity to Pressure and to temperature. The sensitivity to Hydrostatic Pressure has a negative sign and exceeds −43 rad/MPa × m at 1.55 μm for both fibers. In combination with the very low sensitivity to temperature, this makes our fibers the candidates of choice for the development of microstructured fiber based Hydrostatic Pressure measurement systems.
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Measurements of Hydrostatic Pressure and temperature sensitivity in birefringent holey fibers
Photonic Crystal Materials and Devices III, 2006Co-Authors: Tadeusz Martynkien, Gabriela Statkiewicz, Mariusz Makara, Jan Wojcik, Jacek Olszewski, Marcin Szpulak, Waclaw Urbanczyk, Tomasz Nasilowski, Pawel Mergo, Francis BerghmansAbstract:We report on experimental studies of polarimetric sensitivity to temperature and Hydrostatic Pressure in two highly birefringent index guided photonic crystal fibers. Our results confirm earlier theoretical predictions indicating that polarimetric sensitivity to temperature in highly birefringent PCF with specific constriction can be very low. Proper choice of constructional parameters of the PCF can lead to complete temperature desensitization. On the other hand, relatively high polarimetric sensitivity to Hydrostatic Pressure in the analyzed structures make them good candidates for applications as active elements in Hydrostatic Pressure sensors.
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Liquid crystal optical fibers in Hydrostatic Pressure monitoring
Technology and Applications of Light Guides, 1997Co-Authors: Tomasz R. Wolinski, Tomasz Nasilowski, Wojtek J. Bock, Andrzej W. Domanski, Roman Dabrowski, Miroslaw A. Karpierz, Witold Konopka, Janusz Parka, Marek Wojciech Sierakowski, Jan WojcikAbstract:An original idea of Hydrostatic Pressure monitoring based on a new kind of anisotropic fibers with a liquid crystalline core is presented. The liquid crystalline-core optical fiber giving a possibility of birefringence control unite the unique advantages of liquid crystals and quality of fiber technology what can be used for continuous Pressure monitoring. Preliminary results of experimental studies of light propagation by optical fibers with liquid crystalline cores under Hydrostatic Pressure conditions are reported.
Karol Tarnowski - One of the best experts on this subject based on the ideXlab platform.
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highly birefringent microstructured fibers with enhanced sensitivity to Hydrostatic Pressure
Optics Express, 2010Co-Authors: Tadeusz Martynkien, Jan Wojcik, Jacek Olszewski, Pawel Mergo, Gabriela Statkiewiczbarabach, Thomas Geernaert, Camille Sonnenfeld, Alicja Anuszkiewicz, Marcin K Szczurowski, Karol TarnowskiAbstract:We designed, manufactured and characterized two birefringent microstructured fibers that feature a 5-fold increase in polarimetric sensitivity to Hydrostatic Pressure compared to the earlier reported values for microstructured fibers. We demonstrate a good agreement between the finite element simulations and the experimental values for the polarimetric sensitivity to Pressure and to temperature. The sensitivity to Hydrostatic Pressure has a negative sign and exceeds −43 rad/MPa × m at 1.55 μm for both fibers. In combination with the very low sensitivity to temperature, this makes our fibers the candidates of choice for the development of microstructured fiber based Hydrostatic Pressure measurement systems.
