A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
In recent years, microwave NDT&E techniques, mostly in the near field using open- ended rectangular waveguide probes, coaxial mono-pole antennas, microstrip antennas, have been extensively used to interrogate a wide variety of cement based materials for their important physical and structural properties. Some examples of these R&D projects were mentioned in the Introduction of this paper. Three microwave instruments developed at BUTE (Hungary) had been introduced for inspection of civil structures and materials of building industries. New microwave moisture sensors presented show some significant advantages for water content determination in bins of raw materials and in concrete mixers. The reflection type DCS is being used on-line, density-independent, improved measurement speed and is able to measure moisture content accurately in materials with large granule size, due to the multi-frequency operation (2.45-5.85-10.50 GHz) and the application of ANN. A free-space arrangement was applied at PBM, using the modulated scattering technique. This microwave NDT of particle- boards gives us information about moisture content, abnormal density or glue overdose or presence of air inclusions in the board at the moment of its occurrence. Industrial tests showed that the developed measurement system is suitable for on-line, real-time quality monitoring of large boards (3m x 17m). Our software can display graphically the surface distribution of these parameters on the whole board, so its quality could be judged simply at a glance. The double frequency (0.9 and 2.45 GHz) NCS is designed for use in concrete mixers above the moving mix, or for inspection of civil structures with large wall-thickness, because of the high dynamic range in attenuation measurement. The active BSC is independent of the Tx/Rx unit, so the arrangement is practically single-sided. The density-independent operation will be provided by an ANN with self-learning by presenting samples of different moisture and density.
In recent years, microwave NDT&E techniques, mostly in the near field using open- ended rectangular waveguide probes, coaxial mono-pole antennas, microstrip antennas, have been extensively used to interrogate a wide variety of cement based materials for their important physical and structural properties. Some examples of these R&D projects were mentioned in the Introduction of this paper. Three microwave instruments developed at BUTE (Hungary) had been introduced for inspection of civil structures and materials of building industries. New microwave moisture sensors presented show some significant advantages for water content determination in bins of raw materials and in concrete mixers. The reflection type DCS is being used on-line, density-independent, improved measurement speed and is able to measure moisture content accurately in materials with large granule size, due to the multi-frequency operation (2.45-5.85-10.50 GHz) and the application of ANN. A free-space arrangement was applied at PBM, using the modulated scattering technique. This microwave NDT of particle- boards gives us information about moisture content, abnormal density or glue overdose or presence of air inclusions in the board at the moment of its occurrence. Industrial tests showed that the developed measurement system is suitable for on-line, real-time quality monitoring of large boards (3m x 17m). Our software can display graphically the surface distribution of these parameters on the whole board, so its quality could be judged simply at a glance. The double frequency (0.9 and 2.45 GHz) NCS is designed for use in concrete mixers above the moving mix, or for inspection of civil structures with large wall-thickness, because of the high dynamic range in attenuation measurement. The active BSC is independent of the Tx/Rx unit, so the arrangement is practically single-sided. The density-independent operation will be provided by an ANN with self-learning by presenting samples of different moisture and density.
Microwave inspection of civil structures
Mikrowellenprüfung von Bauwerken
Volgyi, F. (author)
2004
8 Seiten, 8 Bilder, 62 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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