The document summarizes the projects of the Optical Fibre Sensors Research Centre at the University of Limerick. It describes projects involving biomedical sensors, radiation therapy dosimetry sensors, gas and pressure monitoring, food monitoring, and structural health monitoring of historical buildings. It also outlines collaborations with universities and companies in Italy and China on fiber optic sensor technologies.

1. Optical Fibre Sensors Research Centre
PROJECT PORTFOLIO
[University of Limerick, Mar 2013]
Daniele Tosi
daniele.tosi@ul.ie
dan82ddt
www.ofsrc.ul.ie

2. About us
UL, OFSRC, Ireland
Marie Curie Fellow @ OFSRC
EU COST network
Cleveland Clinics FOS partners
EFPI 1.0 demo/licensing Italy
(w/ Pointec Ltd) FP7 University Federico II, Naples
Politecnico di Torino (PhD, MSc)
IFBG spun-out Zhejiang, China
IFBG licensing/distribution
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

3. Outline
‣ Biomedical extrinsic Fabry-Perot sensors
‣ Radiation therapy dosimetry sensor
‣ Gas/pressure exhaust monitoring
‣ INFRA and Food Monitoring projects
‣ Politecnico di Torino cooperation activities
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

4. EFPI system
L d
Capillary
Broadband source
Interrogator
FBG MM fiber
SM fiber
Processing
Compensation
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

5. EFPI principle
Air-gap length L = L0 - Sp ΔP
FP Spectrum ~ S0 + k cos[4π(L - Sp ΔP)/λ]
Temperature: L = L0 - Sp ΔP + ST ΔT FBG
Pressure
L0 - Sp ΔP
d
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

6. Development
Capillary 220 L d
Visible/NIR wavelength
SM MM
10/125 62/200 LPG integration
⍉125μm
Original build process
SM ⍉80μm
10/125
⍉40μm
SM on SM Visible wavelength
Evanescent field/SPR bio-chemical sensors
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

7. Performance chart
March 2013 Next release
Size ∅ 200μm ∅125➡80➡40μm
Accuracy 0.2 mmHg 0.02 mmHg
Sensitivity 0.5 nm/kPa 1 nm/kPa
Spectrometer 5/166pm, 1 kHz 1-10pm, 5kHz
Drift To be quantified <1 mmHg/hr
Integration FBG FBG, LPG, EFS
Packaging Stent/catheters Other options
Daniele Tosi - Fiber optics Fabry-Perot interferometers for medical device applications - UL2012

8. Development
FBGA SLED
Switch Circulator
Spectrometer
166 pm resolution FBG interrogator
5 pm pixel accuracy 1 pm resolution
Max 1 kHz 2 pm accuracy
1 Hz + high speed
+ high-speed multi-laser interrogation
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

9. Urodynamics
Differential pressure measurement
Interrogator
Bladder outlet obstruction (BOO) diagnostic
RFP - A novel biomedically compatible optical fibre pressure sensor for clinical diagnostic
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

10. Cardiovascular
Daniele Tosi - Fiber optics Fabry-Perot interferometers for medical device applications - UL2012

11. Applications
Robotic surgery
Pressure force sensors 0 to 300 mmHg
1mmHg accuracy, stability over several hours
Miniature size ⍉ 125/80/(40) μm
Intra-chranial pressure (ICP)
ICP 1 to 20 mmHg
≲0.1 mmHg accuracy, stability over minutes
Miniature size ⍉ 200/125/80 μm
Intra-aortic balloon (IAB) pumping
Pressure sensor 0 to 200 mmHg, istantaneous
1mmHg accuracy, <10mmHg stability over days
Size, form factor, redundancy, placement (⍉ 200 μm)
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

12. Radiation sensor
Radiation therapy POF sensor
Monitoring of radiation levels delivered
through radiation therapy
Galway Clinic
POFgARD project
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

13. Radiation sensor design
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

14. Radiation measurement
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

15. Gas monitoring
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

16. Exhaust monitoring
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

17. INFRA project
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

18. Food monitoring
Colorimetry + temperature
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

19. Torino, Olympic Bridge
Politecnico di Torino, Dept. of Civil Engineering + Dept. of Electronics
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

20. Torino, Guarini Chapel
MEMS + POF + architectural study
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

21. Venice, German Sinagogue
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

22. Dallara, CRF automotive
Daniele Tosi - Optical Fibre Sensors Research Centre - project portfolio - UL2013

23. SFI Ireland/US grant
➡ Web: www.sfi.ie
➡ US-Ireland R&D partnership program
➡ Core areas: health, sensors/sensor networks (2/5)
➡ Ireland (coord.) + US + Northern Ireland
➡ 350k€ ($455k) - 3 years
Daniele Tosi - Fiber optics Fabry-Perot interferometers for medical device applications - UL2012