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International Journal of Geophysics
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International Journal of Geophysics
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2011
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Article
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Tab 4
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Research Article
Noninvasive Remote Sensing Techniques for Infrastructures Diagnostics
Table 4
Oscillation frequencies of the beam under the four direct impacts measured by Ground-based microwave radar interferometer.
Drop
First frequency (Hz)
Secondary frequency (Hz)
1
1.6
4.8
2
1.6
4.6
3
1.4
4.5
4
1.4
3.8