KEYWORDS: Digital signal processing, Clocks, Structural health monitoring, Prototyping, Signal processing, Damage detection, Light emitting diodes, Signal generators, Ferroelectric materials, Sensors
Currently, much of the focus in the structural health monitoring community is shifting towards incorporating health
monitoring technology into real world structures. Deployment of structural health monitoring systems for permanent
damage detection is usually limited by the availability of sensor technology. Previously, we developed the first fully
self-contained system that performs impedance-based structural health monitoring. This digital signal processor based
system effectively replaces a traditional impedance analyzer and all of the manual analysis usually required for damage
determination. The work described here will focus on improving this hardware. Efforts are made to reduce the overall
power consumption of the prototype while at the same time improving the overall performance and efficiency. By
introducing a new excitation method and implementing a new damage detection scheme, reliance on both analog-to-digital
and digital-to-analog conversion are circumvented. These new actuation and sensing techniques, along with the
underlying hardware, are described in detail. The reduction of power dissipation and improved performance are
documented and compared with both traditional impedance techniques and the previous prototype.
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