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An ultrasonic measurement technique has been proposed for ghost suppression with a sparse phased array by using multiple frequencies. A sparse phased array with an inter-element spacing over a half wavelength causes large grating lobes resulting in ghosts. In the proposed method, the ghosts have been effectively suppressed by combining with a lower frequency measurement on the same array. This method...
Ghosts in ultrasonic measurement with a sparse phased array are effectively suppressed by combining directivity patterns using two frequencies. The two-frequency ultrasonic measurement can be realized by tuning the resonant frequency of piezoelectric microsensors composing the array. Piezoelectric tunable resonant microsensors have been fabricated for the measurement technique. The resonant frequency...
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