Post on 11-May-2015
description
Low-Cost Miniature Fiber-Optic Extrinsic Fabry-Perot Interferometric Sensor for Cardiovascular
Pressure Measurement
[CLEO - Europe, 2013]
Sven Poeggel, Daniele Tosi, Gabriel Leen, Elfed Lewis
University of Limerick, IrelandOptical Fibre Sensors Research Centre (OFSRC)
Problem
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
In-vivo pressure measurementHigh accuracy (1 mmHg or below)Minimum invasiveness (size, weight)Low-cost disposable probeImmunity to EMI
FIBER-OPTIC
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 + FBG
Capillary
Launch SM fiber
Diaphragm MM fiber
AIR-GAP
dL
FiberBragg
Grating(FBG)
EFPI/FBG spectrum
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
FBGλB = λ(T0) + 10.2 pm/°C・ ΔT
EFPIΔL = -Sp ΔP -1.6 nm/°C・ ΔT
Air-gap length LFP Spectrum ~ S0 + k cos[4πL/λ]
d Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
EFPI principle
L
Pressure
Air-gap length L = L0 - Sp ΔPFP Spectrum ~ S0 + k cos[4π(L - Sp
ΔP)/λ]Temperature: L = L0 - Sp ΔP + ST ΔT ⇒ FBG
L0 - Sp ΔP
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
EFPI principle
L
FBG FBG detectiondetection
EFPI/FBG system
ASE sourceASE source
SpectrometeSpectrometerr
1530-1600 nm
1520-1596 nm
CouplerCoupler
3 dB1x4 switch
ServerServer
EFPI
EFPI
EFPI
EFPI+FBG
DAQ DAQ (LabVIEW)(LabVIEW) Pressure
Temperature
} Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
EFPI EFPI detectiondetection
Probe Probe calibrationcalibration
Performance chartUL EFPI/FBG
St. JudePressureWire
Opsens OPP-M
TechnologyFiber optic, EFPI/FBG
GuidewireFiber optic,
EFPI
Diameter 0.2 mm 0.35 mm 0.55 mm
Accuracy 0.2 mmHg 2 mmHg 2 mmHg
Speed 100 Hz 25 Hz 20/250 Hz
Stability 0.6 mmHg/hr >5 mmHg/hr 4.0 mmHg/hr
TemperatureCompens.
0.5°CNone None
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
Burette test
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
RMSE = 2.29 mmH2O
RMSE = 1.30 mmH2O
Burette test
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
RMSE = 2.29 mmH2O = = 0.21 mmHg
Long-term stability
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
0.63 mmHg
2.76 mmHg
Typical fiber optic drift ~ 5 mmHg/hr
Heart simulator
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
Heart simulator
Interrogator/processing
Heart pumping
Sensor positioning
(short access)
EFPI spectrumPressure meas.
Spectrometer
ASE source
Heart pumping inle
tFiber inlet
Heart simulator
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
Ventricular assist
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
Polymer Core,Cleveland Clinic, US
Mar 2013FPI positioningVentricular
assist
Reference (fluidic)
Pressure readout
Ventricular assist
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick
Pressure (mmHg)
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
Polymer Core,Cleveland Clinic, US
Mar 2013
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013
Urodynamics
InterrogatorInterrogator
Differential pressure measurement
Bladder outlet obstruction (BOO) diagnostic
Acknowledgments
‣ Cleveland Clinic and Pointec Medical
‣ FP7 Marie Curie (299985-PROBESENSE)
‣ Science Foundation Ireland (RFP/ECE2898)
‣ Enterprise Ireland (IP-2012-0166-Y)
‣ University of Limerick, MSSI and CES depts.
Daniele Tosi - Optical Fibre Sensors Research Centre (OFSRC) - University of Limerick