Design of piezoelectric transducer layer with electromagnetic shielding and high connection reliability

Abstract

Piezoelectric transducer (PZT) and Lamb wave based structural health monitoring (SHM) method have been widely studied for on-line SHM of high-performance structures. To monitor large-scale structures, a dense PZTs array is required. In order to improve the placement efficiency and reduce the wire burden of the PZTs array, the concept of the piezoelectric transducers layer (PSL) was proposed. The PSL consists of PZTs, a flexible interlayer with printed wires and signal input/output interface. For on-line SHM on real aircraft structures, there are two main issues on electromagnetic interference and connection reliability of the PSL. To address the issues, an electromagnetic shielding design method of the PSL to reduce spatial electromagnetic noise and crosstalk is proposed and a combined welding–cementation process based connection reliability design method is proposed to enhance the connection reliability between the PZTs and the flexible interlayer. Two experiments on electromagnetic interference suppression are performed to validate the shielding design of the PSL. The experimental results show that the amplitudes of the spatial electromagnetic noise and crosstalk output from the shielded PSL developed by this paper are − 15 dB and − 25 dB lower than those of the ordinary PSL, respectively. Other two experiments on temperature durability ( − 55 °C–80 °C ) and strength durability (160–1600με, one million load cycles) are applied to the PSL to validate the connection reliability. The low repeatability errors (less than 3% and less than 5%, respectively) indicate that the developed PSL is of high connection reliability and long fatigue life.

Improved sintering activity and piezoelectric properties of PZT ceramics from hydrothermally synthesized powders with Pb excess

“…A certain amount of Pb(NO 3 ) 2 was dissolved in 500 ml deionized water to form 0. 1 were mixed together, and then appropriate amount of KOH were added into the mixed solution. Thereafter, the 50 ml final solution was sealed into a 90 ml Teflon-lined stainless-steel autoclave and heated at 200°C for 4 h under the auto-generated pressure.…”

“…Piezoceramics are the core components in numerous intelligent transducers, detectors and sensors [1]. Among these piezoceramics, perovskite lead zirconate titanate [Pb(Zr, Ti)O 3 , PZT] has become the most efficient and widely applied materials, mainly owing to its excellent piezoelectric coefficient, high Curie temperature and well temperature stability.…”

On research of time reversal imaging method and structural health monitoring system

“…Many researchers have adopted the SMART Layer into their experimental or practical researches to enhance the placement efficiency of PZTs array and reduce the additional weight introduced by wires [23][24][25]. Based on the concept of SMART Layer and combing the electromagnetic shielding design method and the connection reliability design method [26], two kinds of PSL are developed and shown in Fig. 8.…”

Comparative investigations on dielectric, piezoelectric properties and humidity resistance of PZT–SKN and PZT–SNN ceramics

“…As the predominant materials for piezoelectric applications,lead zirconate titanate (PZT) based ceramics are widely applied in multilayer ceramics capacitors (MLCC), ultrasonic motors, and especially, the multilayer piezoelectric actuators [2,3]. For multilayer piezoelectric actuators, piezoelectric materials should possess a high field piezoelectric coefficient, d 33 , of about 450pC/N with a Curie temperature above 300°C so that the piezoelectric actuators could working in the room temperature or relative higher (about 150°C) [4].…”