1. Structural sensors for use in cryogenic environments Daniele Inaudi, CTO

2. SMARTEC SA  Part of Roctest Group / Nova Metrix  World’s largest supplier of structural health monitoring systems  World’s largest supplier of fiber optic sensors  Offices in Canada, US, Switzerland, UK, France  Supply of sensing HW and SW components, SHM systems and associated services  Experience in sensing for cryogenic and radiation environments: CERN, ITER, instrumentation of superconductive magnets, LNG tanks and pipelines, nuclear power plants, nuclear waste disposal

3. Fiber optic Sensors: Why?  Small size  Great variety in the measurable parameters  Distributed and Multiplexed topologies  Insensitive to external perturbations  Reliability in demanding environments  Long-distance remote monitoring  Compatible with data-transmission network

4. Point Sensor: Sensoptic (Fabry-Pérot) Distributed: DiTest / DiTemp (Brillouin and Raman) Long base: SOFO Quasi distributed (multiplexed): MuST (FBG) Fiber Optic Sensor Types

5. Distributed Sensing F F e T1T1 Position [m] Strain [me] Reading Unit Distributed Sensor 0m 1m 100m 1000m 20km T1T1 e T2T2 T2T2 Position [m] Temp. [°C]

6. ITER projects  Qualification and production of fiber- optic sensors for the monitoring of superconductive magnets:  Strain  Small displacement (contact)  Large displacement (contact)  Laser-distance-meters: contactless displacement  Point temperatures  Distributed temperatures

7. Fabry – Perot FO sensor for ITER

8. FBG FO sensors for ITER

9. Qualification for cryogenic conditions Strain and Displacement sensors welded on test support during test at nytrogen temperature

10. Non-contact: Laser Distance Meter

11. Distributed T Testing

12. Thank you for your attention For more information www.roctest-group.com daniele.inaudi@smartec.ch Thank you for your attention