An Innovative Transponder-Based Interferometric Radar for Vibration Measurements
- IDS Ingegneria dei Sistemi S.p.A., Via Livornese 1019, Pisa (Italy)
Ground-based radar interferometry has recently emerged as an innovative technology of remote sensing, able to accurately measure the static or dynamic displacement of several points of a structure. This technique in the last couple of years has been applied to different types of structures, such as bridges, towers and chimneys. This paper presents a prototype system developed by IDS, originally aimed at measuring the structural vibrations of helicopter rotor blades, based on an interferometric technique and constituted by combination of a radar sensor and a series of transponders installed on the target structure. The main advantages of this solution with respect to conventional interferometric radars, are related to the increased spatial resolution of the system, provided by the possibility to discriminate different transponders installed within the same resolution cell of the radar sensor, and to the reduction of the ambient noise (e.g. multi-path) on the radar measurement. The first feature allows the use of the microwave technology even on target areas with limited dimensions, such as industrial facilities, while the second aspect may extend the use of radar interferometric systems to complex scenarios, where multi-reflections are expected due to the presence of natural targets with high reflectivity to the radar signal. In the paper, the system and its major characteristics are first described; subsequently, application to the measurement of ambient vibration response of a lab set-up is summarized. Then the data acquired on a rotating mock-up are reported and analyzed to identify natural frequencies and mode shapes of the investigated structure.
- OSTI ID:
- 21366743
- Journal Information:
- AIP Conference Proceedings, Vol. 1253, Issue 1; Conference: 9. international conference on vibrational measurements by laser and non-contact techniques and short course, Ancona (Italy), 22-25 Jun 2010; Other Information: DOI: 10.1063/1.3455460; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BRIDGES
CHIMNEYS
HELICOPTERS
INDUSTRIAL PLANTS
INTERFEROMETRY
MICROWAVE RADIATION
RADAR
REFLECTIVITY
REMOTE SENSING
ROTORS
SENSORS
SPATIAL RESOLUTION
AIRCRAFT
ELECTROMAGNETIC RADIATION
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RANGE FINDERS
RESOLUTION
SURFACE PROPERTIES