A Low-Cost Wireless Multinode Vibration Monitoring System for Civil Structures

Figure 14

Power spectral density estimates from impulse vibration tests of the high-grade system and the developed system with various postprocessing interpolation strategies: (a) high-grade system; (b) low-cost system without interpolation; (c) low-cost system with linear interpolation; (d) low-cost system with spline interpolation; (e) low-cost system with MAkima interpolation; (f) low-cost system with NUFFT interpolation. The frequencies identified in [46] are marked in red vertical lines.

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