Distributed spatial filtering characteristics of distributed piezoelectric sensors are investigated. In general, a sensor output signal is contributed by a membrane strain and a bending strain. Depending on the sensor placement, a distributed sensor can be only sensitive to either membrane or bending modes — membrane or bending sensor. In addition, a piezoelectric sensor can be sensitive to a mode or a group of modes due to signal average of electrode surface, especially anti-symmetrical modes. Accordingly, the sensor layer can be spatially shaped such that its sensitivity can be specified. These filtering characteristics are discussed and examples demonstrated.

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