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Terrestrial radar interferometry: contactless methodology for vibration monitoring

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This document discusses the use of terrestrial radar interferometry for vibration monitoring of sites and structures. It describes the working principles of real aperture radar and interferometry. A case study is presented where a pedestrian bridge was monitored dynamically using radar interferometry and compared to velocimetry measurements. The results show radar interferometry can reliably measure vibrational behavior of structures in a contactless manner and in a short timeframe with low costs. Future applications could include using the technology for structural performance analysis and maintenance.

Engineering
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…when problems need advanced solutions! Paolo Mazzanti When problems need advanced solutions! Terrestrial radar interferometry: contactless methodology for vibration monitoring Paolo Mazzanti ENEA - Rome, 16th February 2016 SEISMIC MONITORING OF SITES AND STRUCTURES State of the art and future prospects
…when problems need advanced solutions! Paolo Mazzanti https://www.youtube.com/watch?v=wrKnUTU6GK4
…when problems need advanced solutions! Paolo Mazzanti Vibrations data derived from interferometric radar measurements
…when problems need advanced solutions! Paolo Mazzanti Vibrations data derived from interferometric radar measurements …compared with velocimetric data
…when problems need advanced solutions! Paolo Mazzanti Real Aperture Radar - RAR The system is composed of radar sensors with transmitting antenna and a receiving antenna
…when problems need advanced solutions! Paolo Mazzanti Real Aperture Radar (RAR): working principle https://www.youtube.com/watch?v=tQPm-IPyd_U
…when problems need advanced solutions! Paolo Mazzanti dr = dsina sina = h/R d = drR/hh d dr R a Real Aperture Radar (RAR): acquisition geometry
…when problems need advanced solutions! Paolo Mazzanti • Angle of incidence Real Aperture Radar (RAR): acquisition geometry
…when problems need advanced solutions! Paolo Mazzanti Real Aperture Radar(RAR): principles of interferometry
…when problems need advanced solutions! Paolo Mazzanti • Phase ambiguities a -p +p a+2p a+4p Real Aperture Radar (RAR): principles of interferometry
…when problems need advanced solutions! Paolo Mazzanti • Phase ambiguities a -p +p a+2p a+4p Real Aperture Radar (RAR): principles of interferometry
…when problems need advanced solutions! Paolo Mazzanti • Phase ambiguities a -p +p a+2p a+4p Real Aperture Radar (RAR): principles of interferometry
…when problems need advanced solutions! Paolo Mazzanti PHASE Real Aperture Radar (RAR): from phase to frequency
…when problems need advanced solutions! Paolo Mazzanti PHASE DISPLACEMENT Real Aperture Radar (RAR): from phase to frequency
…when problems need advanced solutions! Paolo Mazzanti PHASE DISPLACEMENT FREQUENCY Real Aperture Radar (RAR): from phase to frequency
…when problems need advanced solutions! Paolo Mazzanti • SNR (Signal to Noise Ratio) Distance LOS (m) Time (s) Displacement(mm) 0,2mm0,02mm Amplitude(db) Real Aperture Radar (RAR): signal quality
…when problems need advanced solutions! Paolo Mazzanti Case study: dynamic monitoring of a pedestrian bridge
…when problems need advanced solutions! Paolo Mazzanti Results and comparison with other monitoring sistems: TInRAR vs velocimeter
…when problems need advanced solutions! Paolo Mazzanti Combined interferometric and velocimetric measurement
…when problems need advanced solutions! Paolo Mazzanti 1,26 Hz Interferometer I1 1,32 Hz Interferometer I2 Results from interferometric measurements …
…when problems need advanced solutions! Paolo Mazzanti 1,26 Hz Interferometer I1 1,32 Hz Interferometer I2 1,26 Hz 1,32 Hz Results from interferometric measurements…and velocimetric ones
…when problems need advanced solutions! Paolo Mazzanti Quick vibration monitoring of civil engineering structures 14 sites (structures/infrastructures) in 3 days
…when problems need advanced solutions! Paolo Mazzanti Effectiveness of interferometric radar vibration measurements in environmental noise condition
…when problems need advanced solutions! Paolo Mazzanti Vibrodines or suitable solicitations are necessary to be able to effectively measure vibrations with interferometric radar systems. Effectiveness of interferometric radar vibration measurements in environmental noise condition
…when problems need advanced solutions! Paolo Mazzanti CONCLUSIONS The Terrestrial Radar Interferometry has shown to be a reliable tool for the measure of the vibrational behavior of the structures. The ability of a contactless measure and the very short time of installation allow to determine the dynamic behavior of several structures within short timeframe and very low costs. Future studies must be turned to the exploitation of this technology within the analysis of the structural performance, especially in the perspective of a more and more effective maintenance.
…when problems need advanced solutions! Paolo Mazzanti Don't underestimate that this methodology can be used also for static measurements
…when problems need advanced solutions! Contacts Via Cori snc, Rome, Italy info@nhazca.com www.nhazca.com Thank you for your attention

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Terrestrial radar interferometry: contactless methodology for vibration monitoring

  • 1. …when problems need advanced solutions! Paolo Mazzanti When problems need advanced solutions! Terrestrial radar interferometry: contactless methodology for vibration monitoring Paolo Mazzanti ENEA - Rome, 16th February 2016 SEISMIC MONITORING OF SITES AND STRUCTURES State of the art and future prospects
  • 2. …when problems need advanced solutions! Paolo Mazzanti https://www.youtube.com/watch?v=wrKnUTU6GK4
  • 3. …when problems need advanced solutions! Paolo Mazzanti Vibrations data derived from interferometric radar measurements
  • 4. …when problems need advanced solutions! Paolo Mazzanti Vibrations data derived from interferometric radar measurements …compared with velocimetric data
  • 5. …when problems need advanced solutions! Paolo Mazzanti Real Aperture Radar - RAR The system is composed of radar sensors with transmitting antenna and a receiving antenna
  • 6. …when problems need advanced solutions! Paolo Mazzanti Real Aperture Radar (RAR): working principle https://www.youtube.com/watch?v=tQPm-IPyd_U
  • 7. …when problems need advanced solutions! Paolo Mazzanti dr = dsina sina = h/R d = drR/hh d dr R a Real Aperture Radar (RAR): acquisition geometry
  • 8. …when problems need advanced solutions! Paolo Mazzanti • Angle of incidence Real Aperture Radar (RAR): acquisition geometry
  • 9. …when problems need advanced solutions! Paolo Mazzanti Real Aperture Radar(RAR): principles of interferometry
  • 10. …when problems need advanced solutions! Paolo Mazzanti • Phase ambiguities a -p +p a+2p a+4p Real Aperture Radar (RAR): principles of interferometry
  • 11. …when problems need advanced solutions! Paolo Mazzanti • Phase ambiguities a -p +p a+2p a+4p Real Aperture Radar (RAR): principles of interferometry
  • 12. …when problems need advanced solutions! Paolo Mazzanti • Phase ambiguities a -p +p a+2p a+4p Real Aperture Radar (RAR): principles of interferometry
  • 13. …when problems need advanced solutions! Paolo Mazzanti PHASE Real Aperture Radar (RAR): from phase to frequency
  • 14. …when problems need advanced solutions! Paolo Mazzanti PHASE DISPLACEMENT Real Aperture Radar (RAR): from phase to frequency
  • 15. …when problems need advanced solutions! Paolo Mazzanti PHASE DISPLACEMENT FREQUENCY Real Aperture Radar (RAR): from phase to frequency
  • 16. …when problems need advanced solutions! Paolo Mazzanti • SNR (Signal to Noise Ratio) Distance LOS (m) Time (s) Displacement(mm) 0,2mm0,02mm Amplitude(db) Real Aperture Radar (RAR): signal quality
  • 17. …when problems need advanced solutions! Paolo Mazzanti Case study: dynamic monitoring of a pedestrian bridge
  • 18. …when problems need advanced solutions! Paolo Mazzanti Results and comparison with other monitoring sistems: TInRAR vs velocimeter
  • 19. …when problems need advanced solutions! Paolo Mazzanti Combined interferometric and velocimetric measurement
  • 20. …when problems need advanced solutions! Paolo Mazzanti 1,26 Hz Interferometer I1 1,32 Hz Interferometer I2 Results from interferometric measurements …
  • 21. …when problems need advanced solutions! Paolo Mazzanti 1,26 Hz Interferometer I1 1,32 Hz Interferometer I2 1,26 Hz 1,32 Hz Results from interferometric measurements…and velocimetric ones
  • 22. …when problems need advanced solutions! Paolo Mazzanti Quick vibration monitoring of civil engineering structures 14 sites (structures/infrastructures) in 3 days
  • 23. …when problems need advanced solutions! Paolo Mazzanti Effectiveness of interferometric radar vibration measurements in environmental noise condition
  • 24. …when problems need advanced solutions! Paolo Mazzanti Vibrodines or suitable solicitations are necessary to be able to effectively measure vibrations with interferometric radar systems. Effectiveness of interferometric radar vibration measurements in environmental noise condition
  • 25. …when problems need advanced solutions! Paolo Mazzanti CONCLUSIONS The Terrestrial Radar Interferometry has shown to be a reliable tool for the measure of the vibrational behavior of the structures. The ability of a contactless measure and the very short time of installation allow to determine the dynamic behavior of several structures within short timeframe and very low costs. Future studies must be turned to the exploitation of this technology within the analysis of the structural performance, especially in the perspective of a more and more effective maintenance.
  • 26. …when problems need advanced solutions! Paolo Mazzanti Don't underestimate that this methodology can be used also for static measurements
  • 27. …when problems need advanced solutions! Contacts Via Cori snc, Rome, Italy info@nhazca.com www.nhazca.com Thank you for your attention

Editor's Notes

  1. 1
  2. CROLLO NELL’EDIFICIO VISIBILE IN FOTO
  3. Basta cliccare una sola volta per avviare l’animazione con la comparsa progressiva dei punti di monitoraggio. Alla fine, con un secondo clic compare la casella di testo.