IFBG pitch - description, competitive advantage, applications

1. IFBG - Intelligent FIber Bragg Gratings
Daniele Tosi - sirddt@gmail.com
Guido Perrone - guido.perrone@polito.it
Business pitch
Politecnico di Torino
Optical Fiber and Components Resarch Group
www.fco.delen.polito.it/

2. Roadmap
Technology overview
IFBG outline
Signal processing
Performance
In-house validation
Applications
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

3. Optical fiber sensors
Sensors embedded into optical fiber devices
Multitude of physical parameters transduced into fiber
Strain
Vibrations
Pressure
Temperature
Differential strain
Biochemicals
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

4. Why optical fibers?
➡ με, nε, <nε sensing resolution
Super performance ➡ 0.01 ˚C accuracy
➡ >50 km sensing distance
➡ Miniature size (∅125μm + coating)
Miniature size ➡ Lightweight, easily embeddable
➡ Versatile fiber coating
➡ Punctual sensors
Distribution ➡ Multiplexed, long-distance multiplexing
➡ Distributed, quasi-distribuited
➡ Totally EMI compatible
Total immunity ➡ Fire-safe, passive device
➡ Compatible with high-safety standards
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

5. Fiber Bragg Grating
FBG = fiber optic filter
FBG cascade ⬌ Multiplexing
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

6. FBG sensor principle
•Information encoded in
FBG optical spectrum
•Linear dependance on
strain and temperature
•Top performance sensor
•Interrogation = ??
Reflected Bragg wavelength shifts linearly with variation of
tensile strain and temperature
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

7. FBG sensors
Strain AND temperature
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

8. FBG sensors
FBG sensors:
‣In-fiber device (∅125 μm)
‣Length 0.5-2 cm (unpackaged)
‣Linear strain sensitivity 1pm/με
‣Temperature sensitivity 10pm/˚C (compensation)
‣Multiplexed in cascade up to 40
Strain AND temperature to $200 (packaged) per FBG
‣Cost $35 (naked)
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

9. Competitive landscape
Accuracy
0.1nε
FOS
niche
10nε FBG LDV
FBG custom
1με WSN standard
WSN high
100με low
System cost
$100 $1k $10k $100k
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

10. Competitive landscape
Accuracy
0.1nε
FOS
niche
10nε FBG LDV
FBG custom
1με WSN standard
IFBG
WSN high
100με low
System cost
$100 $1k $10k $100k
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

11. IFBG prototypes
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

12. IFBG prototypes
Developed in house
Cheapest optics + processing
Cost ~ $2.5k
1
Based on a OTS FBG analyzer
+ on-board intelligence
2
Cost ~ $8.5k
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

13. FBG arrangement
FBG matrix
...
channel 1
...
channel 2 . . .
. . .
. . .
...
channel N
2, 4, 16, 64 channels
<40 wavelengths wavel. 1 wavel. 2 wavel. W
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

14. Architecture 1
FBG matrix
...
...
. . .
. . .
. . .
...
Switch
Laser
controller
Photodiode Laser array
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

15. Circulator Switch
Architecture 1
FBG matrix
...
... TEC
. Laser . Photodiode .
. . .
. . .
...
Switch
Laser
controller
Photodiode Laser array
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

16. Architecture 2
FBG matrix
...
...
. . .
. . .
. . .
...
Switch
SLED
FBGA
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

17. Architecture 2
FBG matrix
...
...
. . .
. . .
. FBGA . .
...
Switch SLED
SLED
Switch Circulator
FBGA
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

18. Sensor assembly
Concrete mount, embedding/
annealing in composite structures
Off the shelf:
•Composite
Polyimide strip, long-range strain +
high sensitivity vibration detection
•CFRP mounts
•High temperature
•Temp. insensitive
Bench mount, crack meter •Diaphragm
•Custom packaging
Temperature sensor; naked FBG
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

19. Competitive landscape
Accuracy
0.1nε
FOS
niche
10nε FBG LDV
FBG custom
1με WSN standard
IFBG
WSN high
100με low
System cost
$100 $1k $10k $100k
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

20. Competitive landscape
Accuracy
Processing
0.1nε
FOS
IFBG
niche
10nε FBG LDV
FBG custom
1με WSN standard
IFBG
WSN high
100με low
System cost
$100 $1k $10k $100k
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

21. Signal processing
1. Frequency estimation
SNR gain 15-20 dB
2. Adaptive filtering
SNR gain 10-15
3. Peak tracking
Accuracy gain 10-50 D. Tosi, G. Perrone, “Low-cost, high-sensitivity, signal
processing-enhanced fiber Bragg grating sensing system
+ more for condition-based application”, Sensor Letters, 2011
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

22. Performance chart
Commercial IFBG 1 IFBG 2
Accuracy 1-5 με 1nε (freq.) 0.1με
Sensing range ±1000 με ±100 με ±2000 με
Frequency 1 Hz / 5 kHz 50 kHz (DAQ) 1 Hz (5 kHz)
Sensor # 20/channel 5/channel 40/channel
Processing time Instant Long Short
Cost (box) $10-50k $2.5k $8.5k
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

23. Commercial offer
+
Micron Optics FBG interrogator
General-purpose software
(5με, 2 Hz, 30 FBGs, $35k) No API/customization
+
Installation
In-situ calibration/test
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

24. Development flow
Packaging
Optimization ➡ FBG packaging
➡ Miniaturization ➡ Standardization
➡ Board integration ➡ Building blocks
➡ Power consumption
Processing
➡ Embedded DSP
➡ Integration/cloud
➡ Data reduction/fusion
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

25. Applications
➡ Strain sensing (static and dynamic)
‣ Civil engineering, infrastrictures (civionics)
‣ Security/defense applications
‣ Smart cities
‣ Oil&gas, energy
➡ Acoustics and ultrasound
➡ Temperature in harsh environment
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

26. Structural monitoring
FBG vs MEMS: 25 dB vs 6 dB Sample structure (flexible bar)
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

27. Structural monitoring
Wall resonance
Rigid structure
D. Tosi, M. Olivero, A. Vallan, G. Perrone, “Dynamic strain measurement system
MEMS accelerometer fail with fiber Bragg gratings and noise mitigation techniques,” Measurement Science
and Technology, 2009
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

28. Road bump
Left
Mid
D. Tosi, M. Olivero, A. Vallan, G. Perrone, “Weigh-in-motion through
Right
fibre Bragg grating optical sensors,” Electronic Letters, Vol. 47, No. 17,
2010
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

29. Acoustics
D. Tosi, M. Olivero, G. Perrone, Applied Optics, vol. 47, No. 28, 2008
Voice spectrum transducer
Heartbeat sensor
IFBG pitch
Sensor mount (no diaphragm) Daniele Tosi, Guido Perrone - Politecnico di Torino

30. Temperature
Temperature chamber
Outdoor
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

31. Infrastructures
Torino, Passerella Olimpica

32. Smart cities
D. Tosi, FBG for smart cities monitoring, Kuang Chi Institute of
Advanced Technologies, Shenzen (China), Aug 2011
➡ +15% lifecycle
➡ +12% prediction
(Vega park estimate)

33. Perimeter securing
Changi airport, Singapore
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

34. Integrity monitoring
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

35. 4D mapping
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

36. Energy
Vestas installation
➡ +10% lifecycle
➡ +10% efficiency
(Vestas data)IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

37. Oil&gas
➡ Pipeline monitoring
➡ DTS/FBG integration
IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino

38. Industrial engineering
D. Tosi, G. Perrone, “Low-cost,
high-sensitivity, signal
processing-enhanced fiber
Bragg grating sensing system
for condition-based
application”, Sensor Letters,
2011

39. IFBG pitch
Daniele Tosi, Guido Perrone - Politecnico di Torino