A spherically-shaped PZT thin film ultrasonic transducer with an acoustic impedance gradient matching layer based on a micromachined periodically structured flexible substrate.

Sensors (Basel) · 2013 · PMC3859077 · PMID 24113683

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a decreasing trendno p-value reported

The surface curvature of the entire cavity exhibits a decreasing trend from the vertex to the bottom region.

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