Interdigitated PVDF transducer for Lamb wave generation and reception

2005 ◽  
Author(s):  
Hua Gu ◽  
George M. Lloyd ◽  
Ming L. Wang
Keyword(s):  
Lamb Wave ◽  
Wave Generation

Influence of Adhesive Layer on Actuation of Lamb Wave Signals

2012 ◽  
Vol 525-526 ◽  
pp. 617-620 ◽  
Author(s):  
Z. Sharif-Khodaei ◽  
Qu Liu ◽  
M.H. Aliabadi
Keyword(s):  
Lamb Wave ◽  
Adhesive Layer ◽  
Composite Plates ◽  
Wave Generation ◽  
Actuation Frequency ◽  
Adhesive Thickness

In this work, Lamb wave generation and propagation have been modelled in composite plates. Actuation and acquisition of signals when the PZT transducers are tied to the structure or bonded with an adhesive layer are investigated. The effect of adhesive thickness and actuation frequency of Lamb wave have been examined.

Flexible Tunable Interdigital Transducer for Lamb Wave Generation

2016 ◽  
Vol 251 ◽  
pp. 120-125
Author(s):  
Michał Mańka
Keyword(s):  
Lamb Wave ◽  
Power Source ◽  
Wave Generation ◽  
Interdigital Transducer ◽  
Novel Concept ◽  
Physical Changes

In this paper a novel concept of the MFC based IDT, Tunable Interdigital Transducer (T-IDT), is presented. The proposed transducer is the extension of the MFC based IDT, where the solid comb electrodes are replaced by series of discrete, stripe electrodes which can be connected independently into the groups and connected to the power source. The span between the centers of the electrodes' groups connected to the same phase are corresponding to the nominal wavelength of the wave excited by the transducer. This makes possible matching to different wavelengths without a need of physical changes of the electrodes’ layout.

scholarly journals Lamb wave generation using nanosecond laser ablation to detect damage

2017 ◽  
Vol 24 (24) ◽  
pp. 5842-5853 ◽  
Author(s):  
Naoki Hosoya ◽  
Ryosuke Umino ◽  
Atsushi Kanda ◽  
Itsuro Kajiwara ◽  
Atsushi Yoshinaga
Keyword(s):  
Laser Ablation ◽  
Damage Detection ◽  
Lamb Wave ◽  
Lamb Waves ◽  
Wave Generation ◽  
Nanosecond Laser ◽  
Large Area ◽  
Contact Damage ◽  
Contact Type ◽  
Aluminum Alloy 2024

This paper proposes a non-contact damage detection method based on Lamb waves generated by laser ablation (LA). Previously, Lamb waves generated by contact-type sensors such as acoustic emission or piezoelectric zirconate titanate devices have been studied to detect damage. Lamb wave generation systems with embedded contact-type excitation devices to objective structures to be inspected may quickly realize large-area damage detection on a huge object such as an aircraft. However, replacing contact-type devices with non-contact devices in Lamb wave generation systems, the systems will have sufficient potential to excite under the specific conditions such as submerged target structures in liquid and high-temperature substances. The LA-generated Lamb waves that have amplitudes several hundred times larger than those generated by conventional laser-thermoelastically generated Lamb waves are of advantage from the viewpoint of the signal-to-noise ratio in the measurements. When the laser fluence reaches 1012–1014 W/m2, which is greater than that for laser-thermoelastic regime, a LA regime is induced. The amplitudes of the LA-generated Lamb waves might be higher than those of the laser-thermoelastically generated Lamb waves; this is within the scope of the assumption. Since the LA process entails a number of nonlinear processes such as melting, vaporization, and sublimation, it is important to confirm that LA could generate a Lamb wave and its mode. In this paper, Lamb waves that contain broadband frequency elements of more than several hundred kHz are generated by non-contact impulse excitation using LA, which is common in vibration tests in the high-frequency range, laser peening, propulsion of micro-aircraft, bolt loosening diagnosis, etc. The present method is evaluated by comparing the measured and calculated propagation phase and group velocities of the Lamb waves. Furthermore, the feasibility of our approach is demonstrated by non-contact damage detection against an aluminum alloy 2024 plate with a crack.

A modified design of the omnidirectional EMAT for antisymmetric Lamb wave generation

2018 ◽  
Vol 282 ◽  
pp. 251-258 ◽  
Author(s):  
Wenxiu Sun ◽  
Guoqiang Liu ◽  
Hui Xia ◽  
Zhengwu Xia
Keyword(s):  
Lamb Wave ◽  
Wave Generation
Sign in / Sign up

Export Citation Format

Share Document