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University of Limerick - Presentation at Conference on Lasers and Electro-Optics Europe 2013 - Diaphragm etching
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![Diaphragm Etching in Extrinsic Fabry-Perot Interferometric
Fiber Optic Pressure Sensors
[CLEO - Europe, 2013]
Sven Poeggel, Daniele Tosi, Gabriel Leen, Elfed Lewis
University of Limerick, Ireland
Optical Fibre Sensors Research Centre (OFSRC)](https://image.slidesharecdn.com/dtosicleoetch-130505043627-phpapp01/85/D-tosi-cleo_etch-1-320.jpg)
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Report In Japan 20060613 Liuxu
The document summarizes recent developments in optical and photonic technology at Zhejiang University's Department of Optical Engineering. It discusses research on micro- and nano-fibers, photonic crystals, optical thin film devices, and their applications. The department has grown to become a leading institution in China for optical engineering education and research, with over 98 faculty/staff members and extensive funding for projects.
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The document discusses plans to form an international collaboration to study future circular colliders at CERN, including a 100 TeV proton-proton collider (FCC-hh), a lepton collider (FCC-ee), and a lepton-hadron collider (FCC-he). It outlines initial parameters and opportunities for the superconducting radio frequency (RF) systems, which will need to provide up to 100 MW of continuous wave power to accelerate beams. Key areas of study for the large-scale FCC RF systems include cavity and cryomodule technology, reliability, efficiency, and operational aspects.
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University of Limerick - Politecnico di Torino - presentation for Optical Metrology 2013, Munich - FBG paper.
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The document discusses Intelligent Fiber Bragg Gratings (IFBG), which are fiber optic sensors embedded in optical fiber that can sense multiple physical parameters. IFBG prototypes have been developed in-house that are cheaper than existing solutions. IFBGs use Fiber Bragg Gratings (FBG) and can be multiplexed into arrays and interrogated using different architectures involving switches, lasers, and photodiodes. Potential applications include structural health monitoring of composites.
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This document discusses fiber optic sensors and opportunities for improving their commercial viability. It begins with an overview of the technology, highlighting fiber optic sensors' superior performance, small size, distributed sensing capabilities, and safety. However, their high cost and lack of scalability have limited adoption. The document proposes a "lab-in-a-fiber" approach using microfluidics to develop low-cost, plug-and-play fiber optic sensors that can measure multiple parameters like strain, temperature, pressure, chemicals, and biomedical readings. This would help address key issues currently restricting the technology's growth and enable broader real-world deployment.
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The document discusses fiber optic sensor technologies and their applications. It describes how fiber Bragg grating (FBG) sensors work by detecting changes in the refractive index modulation of an optical fiber core in response to strain and temperature. FBG sensors can be multiplexed by attaching multiple FBG arrays to an optical fiber and using wavelength division multiplexing to separate the signals. The market for fiber optic sensors is growing and expected to surpass wireless sensor networks by 2011 due to fiber optic sensors' immunity to electromagnetic interference and ability to distribute sensing points along an optical fiber.
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D tosi cleo_etch
- 1. Diaphragm Etching in Extrinsic Fabry-Perot Interferometric Fiber Optic Pressure Sensors [CLEO - Europe, 2013] Sven Poeggel, Daniele Tosi, Gabriel Leen, Elfed Lewis University of Limerick, Ireland Optical Fibre Sensors Research Centre (OFSRC)
- 2. Extrinsic FP Interferometer Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick EFPI: Fiber-optic Fabry-Perot interferometric sensor based on all- silica glass structure: (1) launch fiber, (2) diaphragm, (3) capillary Capillary Launch SM fiber Diaphragm MM fiber AIR-GAP dL
- 3. d Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick EFPI principle L
- 4. Pressure L0 - Sp PΔ Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick EFPI principle L
- 5. White light system ASE sourceASE source SpectrometerSpectrometer 1530-1600 nm 1520-1596 nm CouplerCoupler 3 dB 1x4 switch ServerServer EFPI EFPI EFPI DAQDAQ (LabVIEW)(LabVIEW) Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick S pre-loadingpre-loading EFPI d estimation Online QA HF bath (argon-ion source)
- 6. Sensitivity Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick d = diaphragm thickness a = fiber inner diameter E = Posson’s ratio μ = Young’s modulus sP = 3(1− μ)2 a4 16Ed3
- 7. Sensitivity Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick d = diaphragm thickness a = fiber inner diameter E = Posson’s ratio μ = Young’s modulus Trade-off Tilt Flatness Problem: - etch the diaphragm to lowest d - preserve air-gap sealing and FPI - independently on etching speed
- 8. Wet etching Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick Hydrofluoric acid (HF), 5-48% - Low BOM cost - Easy setup fume hood - Speed/concentration - Chemically dangerous - Non-constant rate - Remove residual HF
- 9. Dry etching Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick - Multiple probe etching - Etching rate ~constant - Dry, chemical-free - Preserve surface quality - Expensive High power argon-ion etching Femtosecond laser etching ~mm/s etching rate!
- 10. Simulation Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick Etching rate: period = 0.495 mμ Spectrum (as on spectrometer) Q-point vs diaphragm length ( m)μ
- 11. Real-time data Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick “Accelerated” etching in HF 48% Breakpoint
- 12. QA analysis Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick Low-quality probe High-quality probe
- 13. Pressure test Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick 18pm/mmHg SP = 2.3 nm/kPaAccuracy ~0.4 mmHg
- 14. Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013 Conclusions Optimization of EFPI sensitivity for each individual sensor Achievement of 1-10 nm/kPa sensitivity, leading to accuracy below 1 mmHg Results independent on air-gap length, etching type and speed, geometry QA > 70% for maximum sensitivity
- 15. Acknowledgments Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick Research support Financial support UL, Material and Surface Science Institute Science Foundation Ireland (RFP/ECE2898) UL, Chemical and Environmental Science Enterprise Ireland (IP-2012- 0166-Y) Galway-Mayo Institute of Technology FP7-People Marie Curie (299985 Probesens)