Esposito, Marco (2014) Fiber Optical Sensors For High Energy Physics. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: Fiber Optical Sensors For High Energy Physics
Date: March 2014
Number of Pages: 156
Institution: Università degli Studi di Napoli Federico II
Department: Fisica
Scuola di dottorato: Scienze fisiche
Dottorato: Fisica fondamentale ed applicata
Ciclo di dottorato: 26
Coordinatore del Corso di dottorato:
Buontempo, SalvatoreUNSPECIFIED
Giordano, MicheleUNSPECIFIED
Date: March 2014
Number of Pages: 156
Keywords: Fiber Otical Sensors; FBG; Bragg; CERN; Cryogenic Temperature; Relative Humidity; RH; Compact Muon Solenoid; CMS;
Settori scientifico-disciplinari del MIUR: Area 02 - Scienze fisiche > FIS/01 - Fisica sperimentale
Aree tematiche (7° programma Quadro): NANOSCIENZE, NANOTECNOLOGIE, MATERIALE E PRODUZIONE > Integrazione di tecnologie per applicazioni industriali
Date Deposited: 08 Apr 2014 10:25
Last Modified: 26 Jan 2015 11:45

Collection description

High Energy Physics Experiments carried out at the Large Hadron Collider (LHC) of the European Organization for Nuclear Research (CERN) at Geneva, require manufacturing and operation of very complex devices, which demand solutions and challenging synergies to very complex and problematic conditions. These devices operating at CERN need an effective monitoring system to prevent damages which can be caused by many different factors, such as: very high or very low temperature, high magnetic fields and induced mechanical strain, irradiation, electromagnetic interferences, humidity and so on. Traditional sensing systems based on electronic sensor several time present serious drawbacks in such harsh environmental conditions, in particular for the presence of very intense electromagnetic fields generating high noise levels. Moreover the concomitant presence of very high level of irradiation imposes the Radiation Hardness Capability as one fundamental requirement for the sensors to be employed. Fiber Bragg Grating (FBG) optical sensors offer an immediate solution for all these issues: in particular their immunity to electromagnetic noise factor make them clearly preferable with respect to the traditional electronic sensors for High Energy Physics (HEP) applications. Compactness, intrinsic multiplexing (also many tens of sensors can be mounted on the a single optical fiber), long term stable and reliable behavior, multi-parameter sensitivity (commercial sensors detect Mechanical Strain and Temperature, prototypes presented in present thesis detect relative humidity and cryogenic temperatures), reduction of instrumentation and improvement of the workplace safety are further fundamental advantages of the FBGs to be taken in consideration in the future design choices for sensing network in the LHC accelerator and detectors. In present thesis, the suitability of Active Coated FBG sensors for Cryogenic Temperature monitoring in the LHC infrastructures and for Relative Humidity measures in the Compact Muon Solenoid (CMS) experiment at CERN is demonstrated. Moreover the main results of a mathematical model specifically developed to manufacture and to analyze the Active Coated FBG mechanical behavior by correlating the FBG wavelength shift with the external forcing factors, will be presented.


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