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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...
A simple signal processing method has been proposed for ultrasonic position measurement using resonant microsensors. Micro-fabricated sensors have a high quality factor of mechanical resonance and the high Q-value realizes a high sensitivity, but also causes a long tail of dumping oscillation in a response waveform against a ultrasound pulse. The proposed method reveals pulse arrival points in superposed...
A new type of signal processing method for position measurement using ultrasonic array sensors has been proposed. The proposed method can detect wavefronts as phase or amplitude changes in a received waveform using a simple signal processing, by eliminating a long tail of dumping oscillation caused by high-Q mechanical resonance of a sensor element. The obtained waveforms corresponding to the detected...
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