Optimization design of an annular flexible IDT array based on a PDMS-PVDF substrate

Abstract

Flexible sensors play an increasingly important role in damage detection of curved sheet-like structures in large-scale equipment. The sensor array is widely used in plate-like structures because it can collect damage information in a centralized manner. The annular array has the same sensitivity to damage in all directions of the circular array element. This design can realize the comprehensive detection of structural damage and improve the detection efficiency of structural damage. Aiming at the flexible sensor required for health monitoring of large flexible plate-like structures, an annular composite based on a flexible polydimethylsiloxane (PDMS) material and a flexible polyvinylidene difluoride (PVDF) material substrate was designed. A broadband omnidirectional interdigital transducer (IDT) was integrated into an annular IDT array to calibrate its frequency response and vibration output performance, and the sensor was applied to the structural inspection.

Damage imaging method based on circular DE-IDT array for phased array data fusion

“…13 In 2022, our team developed a novel circular dielectric elastomerinterdigital transducer (DE-IDT) based on PVDF substrate and polydimethylsiloxane (PDMS) substrate, analyzing its frequency response characteristics, directivity, sensitivity, etc. 14 However, it has not been applied to damage imaging detection in plate-like structures.…”

“…To broaden the application scope of novel DE-IDT arrays, the research builds upon previous research by exploring the utilization of a circular DE-IDT array for damage imaging detection. 14 The specific focus is on isotropic aluminum panels and orthotropic carbon fiber reinforced polymer (CFRP) panels with flat bottom hole damages. The main objective is to verify the effectiveness of the DE-IDT array in the context of SHM techniques and nondestructive evaluation methods.…”