Összesen 3 találat.


001-es BibID:BIBFORM069056
Első szerző:Esposito, Marco
Cím:Fiber Bragg Grating sensors to measure the coefficient of thermal expansion of polymers at cryogenic temperatures / Marco Esposito, Salvatore Buontempo, Angelo Petriccione, Mauro Zarrelli, Giovanni Breglio, Andrea Saccomanno, Zoltan Szillasi, Alajos Makovec, Andrea Cusano, Antonella Chiuchiolo, Marta Bajko, Michele Giordano
Megjegyzések:One of the fundamental advantages in the employment of the Fiber Bragg Grating (FBG) sensors lies in their capability to allow measurements in extreme environmental conditions with also very high immunity toward external electromagnetic interference factors.The behavior of a polymer-coated FBG sensor, tested in cryogenic conditions at the laboratories of the European Organization for the Nuclear Research (CERN) in Geneva, has been analyzed and will be discussed in this paper. Magnets used in the Large Hadron Collider (LHC) for the High Energy Physics Researches at CERN need in fact extreme cooling conditions to preserve the internal superconductivity highly crucial for their performances. The magnets, built with NbTi based superconductors, are cooled with liquid helium and they operate at 1.9 K. The aim of the present work is to estimate the thermal expansion coefficient of two polymers based on epoxy and methacrylate (PMMA) used as coating of FBGs, in the temperature range from 4 K to 300 K and to check their suitability for the use in temperature monitoring of the superconducting magnets. A standard numerical derivative method has been employed to estimate thermal expansion coefficients; moreover the correlated fluctuation analysis (CFA) based procedure is proposed, as a reliable alternative, to overcome numerical derivative drawbacks at very low temperatures within the range of 4?20 K. The calculated values of thermal expansion coefficient for both systems are in agreement with literature data on similar material.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Thermal expansion
Cryogenic temperature
Fiber optic sensor
Megjelenés:Sensors and Actuators A-Physical 189 (2013), p. 195-203. -
További szerzők:Buontempo, Salvatore Petriccione, Angelo Zarrelli, Mauro Breglio, Giovanni Saccomanno, Andrea Szillási Zoltán (1971-) (fizikus) Makovec Alajos (1987-) (fizikus) Cusano, Andrea Chiuchiolo, Antonella Bajkó Márta Giordano, Michele
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001-es BibID:BIBFORM069044
Első szerző:Makovec Alajos (fizikus)
Cím:Radiation hard polyimide-coated FBG optical sensors for relative humidity monitoring in the CMS experiment at CERN / A. Makovec, G. Berruti, M. Consales, M. Giordano, P. Petagna, S. Buontempo, G. Breglio, Z. Szillasi, N. Beni, A. Cusano
Megjegyzések:This work investigates the performance and the radiation hardness capability of optical thermo-hygrometers based on Fibre Bragg Gratings (FBG) for humidity monitoring in the Compact Muon Solenoid (CMS), one of the four experiments running at CERN in Geneva. A thorough campaign of characterization was performed on 80 specially produced Polyimide-coated RH FBG sensors and 80 commercial temperature FBG sensors. Sensitivity, repeatability and accuracy were studied on the whole batch, putting in evidence the limits of the sensors, but also showing that they can be used in very dry conditions. In order to extract the humidity measurements from the sensor readings, commercial temperature FBG sensors were characterized in the range of interest. Irradiation campaigns with ionizing radiation (?-rays from a Co60 source) at incremental absorbed doses (up to 210 kGy for the T sensors and up to 90 kGy for the RH sensors) were performed on sample of T and RH-Sensors. The results show that the sensitivity of the sensors is unchanged up to the level attained of the absorbed dose, while the natural wavelength peak of each sensor exhibits a radiation-induced shift (signal offset). The saturation properties of this shift are discussed.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Detector design and construction technologies and materials
Interaction of radiation with matter
Detector cooling and thermo-stabilization
Megjelenés:Journal of Instrumentation. - 9 : 03 (2014), p. C03040 (1-10). -
További szerzők:Berruti, Gaia Maria Consales, Marco Giordano, Michele Petagna, Paolo Buontempo, Salvatore Breglio, Giovanni Szillási Zoltán (1971-) (fizikus) Béni Noémi (1980-) (kísérleti fizikus) Cusano, Andrea
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001-es BibID:BIBFORM048730
Első szerző:Makovec Alajos (fizikus)
Cím:Cryogenic temperature measurement using epoxy and PMMA coated fiber bragg grating sensors / Makovec A., Szillási Z., Béni N., Molnár J., Esposito M., Bountempo S., Cusano A., Oetriccione A., Zarrelli M., Breglio G., Saccomanno A., Giordano M., Chiuchiolo A.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény hazai lapban
Doktori iskola
Megjelenés:Acta Physica Debrecina. - 46 (2012), p. 97-106. -
További szerzők:Szillási Zoltán (1971-) (fizikus) Béni Noémi (1980-) (kísérleti fizikus) Molnár J. Esposito, Marco Bountempo, S. Cusano, Andrea Oetriccione, A. Zarrelli, Mauro Breglio, Giovanni Saccomanno, Andrea Giordano, Michele Chiuchiolo, Antonella
Pályázati támogatás:TÁMOP-4.2.2/B-10/1-2010-0024
Fizikai Tudományok Doktori Iskola
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