Conferenza del Dipartimento DIITET 26 e 27 maggio 2014 Romeo Bernini IREA Il progetto Safuel (Safer...
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Transcript of Conferenza del Dipartimento DIITET 26 e 27 maggio 2014 Romeo Bernini IREA Il progetto Safuel (Safer...
Conferenza del Dipartimento DIITET 26 e 27 maggio 2014
Romeo Bernini IREA
Il progetto Safuel (Safer Fuel Systems)
CONSIGLIO NAZIONALE DELLE RICERCHE
26 e 27 Maggio, 2014Convegno del Dipartimento di Ingegneria, ICT e Tecnologie per l’Energia e i Traporti
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
Introduction
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Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
SAFUEL Project
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Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
Rationale
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Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
Objectives
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Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
© Copyright SAFUEL Consortium
Realize a new metal-free fiber optic level sensor with comparable performances with traditional Jet-Fuel Level sensors.
IREA Objectives
Main critical requirements No sensor degradation from -55°C to +70°C. Correct operation and no degradation with Vibration 10-2000 Hz 14Grms. The sensor shall operate correctly and not be damaged when partially or totally exposed to
presence of condensed water on its surface. The sensor shall operate with an optical power not exceeding 35mW. The sensor shall measure the height of fuel with following accuracy: ±1.5mm when tank
empty up to ±3mm when tank is full. No calibration on A/C allowed. Particular installation constraints on sensor shall be identified (e.g. volume, installation
angle, clearance to structure, bonding to structure…). The jet fuel, depending on the type and/or the producer, exhibits different refractive index
value that ranges from about 1.432 of Sasol fuel to about 1.455 of conventional fuels, depending on density.
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
© Copyright SAFUEL Consortium
Four sensing configuration have been evaluated Sensor based on radiation losses Sensor based on radiation losses TIR Sensor based on fuel absorption Sensor based on floating mirror
Three distributed interrogator have been tested- Photon-counting Optical Time Domain Reflectometry (PC-OTDR)- Optical Frequency Domain Reflectometry (OFDR)- Optical Time Domain Reflectometry (OTDR)
Sensing principle selection Sensing mechanism that are insensitive to temperature and to the refractive
index (Bragg grating, interferometers, …) and more in general that don’t require particular compensations in order to increase the fail safety of the system.
Sensing principles
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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Conventional TIR sensor are unable to distinguish fuel from water
Fiber optic input
Fiber optic output
TIR Sensors
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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Sensor Design parameters:• Prism angle 60°• Refractive index n=1.59• Incident angle 60°• Air TIR angle 50°• Water TIR angle 54°• Fuel TIR angle 65°
With a suitable choice of the TIR angle the sensor is sensitive to the fuel and insensitive the water.
Novel TIR Sensor design
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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The sensor is insensitive to the water but it works with any jet fuel
-40 -20 0 20 40 60 80 100
1.38
1.4
1.42
1.44
1.46
1.48
1.5
T [°C]
Ref
ract
ive
Inde
x
Refractive Index fuel vs Temperature
TIR ConditionJP5JP8, JetA, JetA-1JP7JPB-JP4
Novel TIR Sensor design
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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TIR Sensor prototype
Single Sensor Sensor multiplexing
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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TIR OTDR Measurements
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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Optical Power Response vs Liquid Level
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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Optical Power Response vs Liquid Level
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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Jet-Fuel vs Water Detection
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
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Prototype under construction
Conferenza del Dipartimento Roma, 26 e 27 maggio 2014
© Copyright SAFUEL Consortium
Thank you