Presentazione di PowerPoint
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 STRUCTURESState of the art and
future prospects
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https://www.youtube.com/watch?v=wrKnUTU6GK4
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when problems need advanced solutions!Vibrations data derived
from interferometric radar measurements
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Vibrations data derived from interferometric radar
measurementscompared with velocimetric data
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Real Aperture Radar - RAR
Thesystemis composed of radar sensors withtransmitting
antennaand a receiving antenna
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Real Aperture Radar (RAR): working
principlehttps://www.youtube.com/watch?v=tQPm-IPyd_U
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dr = dsinasina = h/Rd = drR/hhddrRaReal Aperture Radar (RAR):
acquisition geometry
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Angle of incidence
Real Aperture Radar (RAR): acquisition geometry
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Real Aperture Radar(RAR): principlesofinterferometry
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Phase ambiguities
a
-p+p
a+2p
a+4p
Real Aperture Radar (RAR): principlesofinterferometry
Paolo Mazzanti
when problems need advanced solutions!Phase ambiguities
a
-p+p
a+2p
a+4p
Real Aperture Radar (RAR): principlesofinterferometry
Paolo Mazzanti
when problems need advanced solutions!Phase ambiguities
a
-p+p
a+2p
a+4p
Real Aperture Radar (RAR): principlesofinterferometry
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PHASEReal Aperture Radar (RAR): from phase to frequency
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PHASEDISPLACEMENTReal Aperture Radar (RAR): from phase to
frequency
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PHASEDISPLACEMENTFREQUENCY
Real Aperture Radar (RAR): from phase to frequency
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when problems need advanced solutions!SNR (Signal to Noise
Ratio)
Distance LOS (m)Time (s)Displacement (mm)0,2 mm0,02 mm
Amplitude (db)Real Aperture Radar (RAR): signal quality
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when problems need advanced solutions!Case study: dynamic
monitoring of apedestrian bridge
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when problems need advanced solutions!CROLLO NELLEDIFICIO
VISIBILE IN FOTO17
Results and comparison with other monitoring sistems:TInRAR vs
velocimeter
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when problems need advanced solutions!Combined interferometric
and velocimetric measurement
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1,26 HzInterferometer I1
1,32 HzInterferometer I2
Results from interferometric measurements
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1,26 HzInterferometer I1
1,32 HzInterferometer I2
1,26 Hz1,32 Hz
Results from interferometric measurementsand velocimetric
ones
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Quick vibration monitoring of civil engineering structures
14 sites (structures/infrastructures) in 3 days
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volta per avviare lanimazione con la comparsa progressiva dei punti
di monitoraggio. Alla fine, con un secondo clic compare la casella
di testo.22
Effectiveness of interferometric radar vibration measurementsin
environmental noise condition
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Vibrodines or suitable solicitations are necessary to be able to
effectively measure vibrations with interferometric radar
systems.Effectiveness of interferometric radar vibration
measurementsin environmental noise condition
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CONCLUSIONSThe 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.
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Don't underestimate that this methodology can be used also for
static measurements
Paolo Mazzanti
when problems need advanced solutions!Contacts
Via Cori snc, Rome, [email protected]
www.nhazca.comThank you for your attention
when problems need advanced solutions!
