Phased Array Tutorial - Table of Contents
Inside a Phased Array Transducer

While phased array transducers come in a wide range of sizes, shapes, frequencies, and number of elements, what they all have in common is a piezoelectric element that has been divided into a number of segments.

Contemporary phased array transducers for industrial NDT applications are typically constructed around piezocomposite materials, which are made up of many tiny, thin rods of piezoelectric ceramic embedded in a polymer matrix. While they can be more challenging to manufacture, composite transducers typically offer a 10 to 30 dB sensitivity advantage over piezoceramic transducers of otherwise similar design. Segmented metal plating is used to divide the composite strip into a number of electrically separate elements that can be pulsed individually. This segmented element is then incorporated into a transducer assembly that includes a protective matching layer, a backing, cable connections, and an overall housing.

The animation above depicts a linear array, with a rectangular footprint, which is a very common configuration for a phased array. Arrays can be arranged as a matrix to provide more beam control over a surface cross section, or as circular arrays which provides a more spherical focusing pattern.

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