Aspects of Lamb-Wave Generation and Transmission

Simulation and Testing of Transducers for Lamb Wave Generation

Ultrasonic Lamb waves are used to detect flaws in plates, and in our work PZT wafers are used both to transmit and receive the waves. Multiple wave modes can exist, which in combination with pulse dispersion can make it difficult to interpret pulse-echo response. Using an appropriate pulse train, we seek to achieve selective generation of the S0 wave in order to distinguish it from the A0 wave ...

the role of russia in transmission of energy from central asia and caucuses to european union

پس ازفروپاشی شوروی،رشد منابع نفت و گاز، آسیای میانه و قفقاز را در یک بازی ژئوپلتیکی انرژی قرار داده است. با در نظر گرفتن این منابع هیدروکربنی، این منطقه به یک میدانجنگ و رقابت تجاری برای بازی های ژئوپلتیکی قدرت های بزرگ جهانی تبدیل شده است. روسیه منطقه را به عنوان حیات خلوت خود تلقی نموده و علاقمند به حفظ حضورش می باشد تا همانند گذشته گاز طبیعی را به وسیله خط لوله مرکزی دریافت و به عنوان یک واس...

Ultrasonic Lamb wave tomography

Nondestructive evaluation (NDE) of aerospace structures using traditional methods is a complex, time-consuming process critical to maintaining mission readiness and flight safety. Limited access to corrosion-prone structure and the restricted applicability of available NDE techniques for the detection of hidden corrosion or other damage often compound the challenge. In this paper we discuss our...

Experimental Studies of Wave Transmission through Single Perforated Sheets and Upright Perforated Wave Filters

The Optimization of Lamb and Rayleigh Wave Generation Using Wideband-low-frequency Emats

This paper describes a non-contact ElectroMagnetic Acoustic Transducer (EMAT) that can be used to generate both Lamb and Rayleigh waves on metal samples. The generated waves are wideband and low frequency with a dominant frequency content centred on approximately 200kHz extending to around 500kHz. Detection of the waves is achieved using a linear coil detection EMAT. The transducers (generator ...