1. Innovative Sensing Systems A survey of the activities on advanced sensing systems for permanent monitoring carried out at Politecnico di Torino – Department of Electronics M. Parvis, G. Perrone, A. Vallan Contact person: G. Perrone, Dep. of Electronics, guido.perrone@polito.it

2. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Technologies FOS market is limited by high prices, complexity, insufficient familiarity with fibers: Plastic optical fibers very low-cost Glass fibers innovative interrogators Fiber Optic Sensors Distributed measurement systems: Integration of FOS in wireless networks Wireless low-power sensor networks Data Acquisition Architectures

3. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Fiber vs. Traditional Sensors FibermechanicalFiber vs. mechanical sensors: –Lightweight, flexibility and versatility. –Resistance to corrosion. –Reduced invasive impact given the possibility to remote the control unit. FiberelectricalFiber vs. electrical sensors: –Immunity to electromagnetic disturbances and discharges. –Impossibility to start fires or explosions. –Simplified remote operation since the same fiber can be used both for sensing and data transmission.

4. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Facilities automatic measurement system testing transducer characterization certified calibration facility. Electronic Measurement Systems optical device characterization fiber Bragg grating fabrication fiber drawing tower clean room for thin film depositions. PhotonLab

5. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Applications Civil and geotechnical engineering: Structural monitoring, landslide evolution, … Mechanics: Automation, monitoring of movable parts, valves, … Chemistry: PH measurement, detection of gases or of toxic products, … Medicine and bioengineering: Physiological parameters, muscular force, …

6. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Capabilities 10 International patents Plastic and glass fiber sensors for: Displacements Non contact distance Vibrations / accelerations Strain - pressures Chemicals (H, SO x, NO x ) Temperature Electrical Field Custom data acquisition systems Wireless network of low-cost miniaturized sensors for real-time and off-line monitoring

7. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples Displacement / crack monitoring Smart buttons and network of wearable sensors Vibrations Deforma tions Chemicals

8. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples: Displacement Sensors Displacement sensors Vibration sensor Up to 60 mm Resolution: < 1/100 mm Repeatability: < 1/20 mm

9. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples: Displacement Sensors Field test in Venice with the support from Fondazione TorinoWireless LOCKLOCK

10. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples: Deformations Low cost sensor able to measure distributed displacements with a sub-millimeter resolution based on the phase shift between transmitted and received signals along a fiber link.

11. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples: Deformations Variation of light polarization Distributed sensor used to measure deformations in a lab model of a bridge. Samples Output power, dB Response to five pressure stimuli Prototype of the control unit

12. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples: Deformations Fiber Bragg Gratings with custom interrogators Acoustic wave detection Structural monitoring

13. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Examples: Vibrations Low cost sensor based on the spectral analysis of the received reflected power to measure the amplitude of vibrations independently from the surface reflectivity. Resolution: < 1/1000 mm High frequency capabilities (current tests up to 40 kHz)

14. M. Parvis, G. Perrone, A. Vallan Dept. of Electronics - Politecnico di Torino - Italy Tel. +39 011 5644146 – guido.perrone@polito.it - www.fco.delen.polito.it Example: Network of Wearable Sensors Wireless network of low-cost wearable buttons for real- time and off-line monitoring of temperature and humidity 10 cent shaped button with temperature and humidity sensor, lithium battery and 2.4 GHz radio Example of biomedical application: skin temperature and humidity monitoring during daily life