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Multilayer actuators with twenty-six 0.7mm-layers (18mm×18mm×10mm) of lead zirconate titanate (PZT-4) were made and tested. These actuators were fabricated in the laboratory with simple techniques and cost low. The new fabrication method not only greatly reduced the cost of piezoelectric stack, but also made it possible to obtain any required size of piezoelectric stacks in the laboratory. A micro-displacement...
This paper presents a micromachined self-powered acoustic emission (AE) sensor based on a novel corrugated PVDF sensing core. The developed transducer exhibits superior signal-to-noise ratio (SNR) and is much higher than current commercial AE sensor based on the same steel-ball drop test experiment. The sensor is applied to monitor identical ball-bearings with different levels of wear. Through short-time...
This paper presents an innovative polymer-based micromachined acoustic emission (AE) sensor. By using the developed micro-embossing fabrication method, the multi-layer piezoelectric polymer (PVDF) thin films with electrodes and dielectric interfaces can be structured as a wavy shaped sensing core element. The core element is then integrated with the novel micromachined epoxy detection-head and being...
This paper presents a novel three-dimensional (3D) four-electrode ion polymer metal composite (IPMC) actuator with accurate omnidirectional control capability. The developed 3D IPMC transducer is used to enclose a section of optical fiber, thereby allowing electronic directional control of conducted laser light. This could be useful in applications such as microendoscopic ocular surgery. The fabricated...
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