Abstract
Integrated piezoelectric-based ultrasonic transducers (UTs) have been developed forpotential structural health monitoring. Fabrication techniques and performanceevaluation of these transducers at selected monitoring sites are presented. Our noveltransducer fabrication approach focuses on the use of handheld and readily accessibleequipment to perform sol–gel spray coating, including the use of a heat gun ora torch, to carry out drying and firing, poling and electrode fabrication. Theapplication of these integrated UTs for thickness measurement of graphite/epoxycomposites, thickness monitoring of ice build up on aluminum plates at lowtemperatures, viscosity measurement of a cooling oil flow at temperatures up to160 °C and monitoring metal debris in cooling oil engines is demonstrated.
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