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SOFO VII MuST SOFO VII MuST Universal Reading Unit Universal Reading Unit for SOFO and for SOFO and MuST (FBG)MuST (FBG)SensorsSensors

Daniele Inaudi

inaudi@smartec.chSMARTEC SA, Manno, Switzerland

www.smartec.ch

Roctest, St. Lambert, Canadawww.roctest.com

Web Seminar

oYou should hear my voice through your PC speaker / headset

oYou can ask questions using the “Questions” panel on the right of your screen. We will answer:• In the “Questions” Panel• At the end of the presentation• By email

oLater this week you will receive link to:• Presentation in PowerPoint, PDF and with narration• Datasheets

Contents

o Introductiono SOFO Technologyo FBG Technologyo SOFO VII reading unit introductiono Configurationso Specificationso Conclusion

Introduction

o Fiber Optic Sensors (FOS) for Structural Health Monitoring (SHM) have moved from R&D to mainstream applications

o Some technologies have emerged as dominant:• SOFO: Long-gauge deformation sensors• FBG’s: Point Strain and Temperature sensors• Brillouin and Raman scattering: distributed Sensing

o Standards and interoperability are emerging, allowing combination of FOS and traditional sensors in the same projects

SOFO Sensors

o Advantages:• Long-gauge: not sensitive to local

changes. Enables monitoring at the scale of structural elements• Built-in temperature compensation• Very accurate: sub-microstrain• Long-term stable• Track record of more than 10’000

sensors installed over 15+ years

SOFO System

o Long-gauge fiber optic deformation sensors

o Gauge length of 0.2m to 10mo High resolution: 2µmo Excellent long-term stabilityo Insensitive to temperature, EM fields, corrosion,...o Embeddable or surface installable in new and existing

structureso Easy and rapid to install and measureo Ideal for monitoring of large structures, especially

concrete, and geotechnical applicaitons

MuST Sensors

o Advantages:• Variety of sensing parameters and

conditions• Strain on metals, composites,

concrete…• Temperature • Tilt• Accelleration• Mulitplexing• Accuracy and stability

Fiber Bragg Grating SensorsFiber Bragg Grating Sensors

MuST System

o Multiplexed Strain and Temperature monitoring systembased on Fiber Bragg Gratings

o Up to 10 strain sensors and 25 temperature sensors on the same line

o Gauge length from 1 cm to 2 mo Temperature measurement for strain and deformation

sensorso Static and dynamic measurements possible

SOFO and MuST (FBG)

o SOFO and FBG: two leading fiber optic sensing technologies for SHM

o SOFO offer superior performance and flexibility in monitoring deformations of large structures. In particular well adapted to measure deformations of concrete, rock and soil.

o SOFO has lower sensor costso MuST (FBG) offer sensors for different parameterso MuST (FBG) sensors can be multiplexed in-lineo In real-world applications it would be ideal to use

sensors based on both technologies in the same project

Interoperability ?

o Is it possible to use SOFO sensors with MuST reading unit and vice-versa?

CompatibleCompatible

CompatibleCompatible

o Is it possible to use SOFO sensors with MuST reading unit and vice-versa? Now you can!

Introducing SOFO VII MuST

Compatible

Compatible

Compatible

Compatible

o Sophisticated algorithms allow measurement of SOFO sensors through spectral analysis.

SOFO VII technology

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SOFO VII MuST Features

o Two formats: • Portable (4 channels)• Permanent installation (4 or 8 channels)

o Each channel can measure either:• 1 SOFO sensor• Up to 5 SOFO sensors, using external 1x5 splitter• 1 chain of FBG sensors (e.g. 7 deformation, 12 strain, 25 T)• Up to 4 chains of FBG sensors, using external 1x4 coupler

o Each Channel can be SW configured for SOFO or MuSTo Integrates field PC with SMARTEC software engine and

user interface

SOFO VII MuST Units

Permanentmonitoring

(4 or 8 channels)

Portable

(4 channels)

o 4 SOFO Sensors

Configuration Example 1

o 2 SOFO sensors + 2 FBG chains

Configuration Example 2

o 5 SOFO sensors per channel using Splitter

Configuration Example 3

o All together now

Configuration Example 4

1x4 coupler

Splitter ≠Coupler

Splitter -> SOFO

Coupler -> MuST

1x5 splitter

SO

FO

Mu

ST /

FB

G

Temperature

Tilt Accelleration Strain

Interfacing with SOFO VII

o Integrated PC allows on-board SMARTEC’s SDB software and advanced connectivity

o SDB, SDB View and SDB Pro now included in the SOFO VII price (starting October 1st 2013)

o Ethernet interface, for remote access and user interfaceo USB interface, e.g. for 4G modem or data downloado Touch screen on portable unit

Map view with colors coding for pre-warning and warning.

Tab view with colors coding for pre-warning and warning.

Sensor list.

Plot view with pre -warning and warning thresholds.

SDB View software

Create sensors Create sensors based on based on complex complex mathematical functions functions

SDB Pro Software

Performance

SOFO Sensors Measurement MuST (FBG) Sensor Measurement

Measurement resolution 2 μm RMS 1 pm RMS

Linearity / Accuracy < 2 ‰ ±2 pm

Sample rate 1 Sample/s (1Hz) 1 Sample/s (1Hz)

Measurement range Max. 50 mm 100 nm (1500 to 1600 nm)

Sensors per channel Max 5 SOFO Deformation sensorsMax 7 MuST (FBG) Deformation sensorsUp to 12 Strain FBG sensorsUp to 25 Temperature FBG sensors

Calibration None, not required NIST traceable wavelength reference

Optical Connectors E-2000 PC (0°) E-2000 AC (8°)

Dynamic range >50 dB >50 dB

Measurement time < 2 s (incl. SDB writing) per channel < 2 s (incl. SDB writing) per channel

Available channel count 4 or 8* channels total, software configurable between SOFO and MuST

SOFO VII / MuST Universal Reading Unit

SPECIFICATIONS – PERMANENT INSTALLATION

AC power supply 230 V 50 Hz / 110 V 60 Hz Auto detect

External connections Ethernet connection, 4 or 8 optical ports, power supply, display and screen

Data logger capacity Typical 5 years of data with measurements every 1h.

Dimensions ~ 500 mm x 500 mm x 210 mm

Weight ~ 25 kg

Operating temperature 10°C to + 40°C- 40°C to + 40°C with heating option*

Humidity 90% non-condensed

SOFO VII / MuST Universal Reading Unit

SPECIFICATIONS - PORTABLE

AC power supply 230 V 50 Hz / 110 V 60 Hz Auto detect

DC power supply 18-20 VDC or internal battery

Nominal consumption 45 Watt (Peak 90W)

Communication RJ45 Ethernet; USB

Control interface 12” touchscreen GUI; Ethernet TCP / IP; USB

External connections Ethernet connection, 4 optical ports, power supply, display and external screen

Data logging format SDB Database

Dimensions ~ 360 mm x 275 mm x 100 mm

Weight ~ 7,3 kg – Aluminum enclosure

Operating temperature +10°C to 40°C

Relative humidity <90%, non-condensed

Operating temperature +10°C to + 40°C

Relative humidity < 90% non-condensed

SOFO VII / MuST Portable Reading Unit

Conclusions

o New SOFO VII MuST reading unit can measure SOFO and MuST (FBG) sensors.

o Mix-and-match to SOFO and MuST sensors as required by each project.

o SOFO sensors can now be multiplexed with splitter.o Portable and permanent unitso Integrates SDB software for data acquisition,

management and user interface (local or remote)o Unique solution on the market, available immediatelyo Competitive pricing, lower than previous generation

SOFO Reading units.